Claims:
1. A circuit breaker (1, 2) comprising:
a modular vent spacer (31, 32) mounted substantially below an earth leakage module (3, 4) enabling use of said earth leakage module (3, 4) for said circuit breaker (1, 2) when configured at a plurality of depths, wherein said earth leakage module (3, 4) comprises a voltage tapping module (37) to ensure safe assembly of said circuit breaker (1, 2).

2. The circuit breaker (1, 2) as claimed in claim 1, wherein the modular vent spacer (31, 32) is connected to said earth leakage module (3, 4) using at least three mechanical joining elements (31a, 32a).

3. The circuit breaker (1, 2) as claimed in claim 1, wherein the modular vent spacer (31, 32) is a modular vent spacer having four poles (31).

4. The circuit breaker (1, 2) as claimed in claim 3, wherein said modular vent spacer having four poles (31) is a convertible modular vent spacer (31) having a knock-out feature (31c) adapted to enable conversion of said modular vent spacer having four poles (31) into at least one other modular vent having three poles (32) by knocking out a part of said convertible modular vent spacer (31).

5. The circuit breaker (1, 2) as claimed in claim 1, wherein the modular vent spacer (31, 32) is a modular vent spacer having three poles (32).

6. The circuit breaker (1, 2) as claimed in claim 1, wherein the modular vent spacer (31, 32) comprises a spacer feature (31d, 32d) adapted to act as a venting region of the circuit breaker (1, 2).

7. The circuit breaker (1, 2) as claimed in claim 1, wherein said earth leakage module (3, 4), is a modular L-shaped three pole earth leakage module (3) or a modular L-shaped three pole earth leakage module (4), and comprises at least a Circuit Breaker Coil Tester (CBCT) housing module (5) and a card housing module (6).

8. The circuit breaker (1, 2) as claimed in claim 7, wherein said CBCT housing module (5) comprises said voltage tapping module (37) having a voltage tapping wire routing casing (36) and a voltage tapping wires (35) with leaf spring arrangement (34).

9. The circuit breaker (1, 2) as claimed in claim 8, wherein
said voltage tapping wire routing casing (36) is an L-shaped casing having a rib (36b) and is adapted to guide said voltage tapping wires (35) from the line conductors of the circuit breaker (1, 2); and
said leaf spring arrangement (34) is placed in the pockets (5a) given in the CBCT housing module (5) such that when said earth leakage module (3, 4) is connected along with the circuit breaker (1, 2), said leaf springs for said arrangement (34) are adapted to make contact with the line conductors of the circuit breaker (1, 2) and the voltage is tapped and fed via., voltage tapping wires (35) at least to a microprocessor (11).

10. The circuit breaker (1, 2) as claimed in claim 8, wherein said voltage tapping wires (35) along with said leaf spring arrangement (34) are routed around rib like walls (36b) in said voltage tapping wire-routing casing (36) forming said voltage tapping module (37).
, Description:
TECHNICAL FIELD
[0001] The present disclosure relates to the field of circuit breaker, and more specifically relates to, a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Electrical switching apparatus, such as circuit breakers, provide protection for electrical systems from electrical fault conditions such as, for example, current overloads, short circuits, abnormal voltage and other fault conditions. Typically, circuit breakers include an operating mechanism which opens electrical contact assemblies to interrupt the flow of current trough the conductors of an electrical system in response to such fault conditions. A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overcurrent, typically resulting from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
[0004] Circuit breaker is a switching device designed to make, carry and break the circuit. A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overcurrent, typically resulting from an overload or short circuit. Circuit breakers are generally installed to protect equipment from overcurrent (than its rated current) situations, for example, when a short circuit or ground fault occurs in an electrical supply conductor. Upon the occurrence of any such overcurrent condition, electrical contacts inside circuit breaker get opened, and stop supply of electrical current to equipment. Designs for circuit breakers generally include accommodations for both high quiescent currents and high withstand currents. To maintain a high withstand current rating, the contacts must be locked closed at the current withstand rating and be able to withstand the large electrodynamics repulsion forces generated by the current flow. With the increase of industry size and automation, the requirement of protection devices has also increased.
[0005] Circuit breakers provide protection for electrical systems from electrical fault conditions such as overload, short circuits and under voltage conditions and are widely used in domestic, commercial and light industrial installations They are designed to detect fault condition and immediately interrupt the current flow, either instantaneously or with time-delay, usually of few milliseconds. Unlike a fuse, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers come in various sizes ranging from small ones that are used to protect individual house hold appliance up to large switchgear designed to protect high voltage circuits feeding an entire city. In addition to fault conditions as mentioned above, there can also be stray voltages on metal enclosures of electrical equipment causing leakage currents to flow through parts which are actually not meant to be live, which can be fatal to human life, commonly called as electrical shock and even result in electrocution.
[0006] Earth leakage modules are designed to disconnect the circuit, if there is any leakage current. Earth leakage modules can detect leakage current typically from setting as low as 30 milliamperes to several amperes. There are earth leakage modules which can detect leakage currents typically 5-30 milliamperes and disconnect quickly in time much lesser than 25-40 milliseconds, and thus preventing electrocution. There are earth leakage modules with low sensitivities and intentionally slower responses designed to protect equipment or avoid risk of electric fires, but not disconnect unnecessarily the equipment with greater leakage currents in normal operation.
[0007] Typically, the earth leakage module basically consists of core balanced current transformer. The earth leakage module is connected such that all the phase conductors of the circuit breaker will pass through core balanced current transformer. In case of fault free system, the flux induced by each of the phase conductor will cancel each other, and the net resultant magnetic flux induced will be nil. As, such there will no secondary voltage induced across the secondary of the CBCT. In case of any residual current flowing through the conductor, the residual flux present in the CBCT will induce a secondary voltage across its secondary. The voltage is tapped from line conductors of the circuit breaker on the line side. The voltage tapped is then fed for powering up of the microprocessor card. The microprocessor card includes settings like current settings, time settings, trip indication etc.
[0008] The earth leakage modules are currently available as integrated as well as add-on modules. The integrated earth leakage modules have the detection, evaluation and actuating means of interruption means integrated inside the circuit breaker module. The circuit breaker with integrated earth leakage protection thus will provide basic circuit breaker functions like protection against overloads, short circuit and under voltage in addition to earth leakage protection. These modules will be compact in size as compared to add-on module, but will provide lesser features. The add-on modules are separate modules housing the detection, evaluation and some parts of actuating means of interruption which are mounted in conjunction with the circuit breaker. Add-on earth leakage modules are available in different configurations.
[0009] The bottom mounted configuration is the one which is mounted just below the circuit breaker in vertically mounted condition. The bottom mounted configuration has the best advantage of catering to all the termination types as that of the basic circuit breaker.
[00010] The side mounted configuration will have the earth leakage add-on module mounted next to the associated circuit breaker along its height in mounted condition. The side mounted will also have advantage of catering to maximum of the termination types as that of the basic circuit breaker. Also, the setting will be visible when mounted in distribution boards.
[00011] The L-shaped add-on configuration will typically have L-shape and when mounted in conjunction with the circuit breaker will have one limb along the height of the breaker and the other limb below the breaker in vertically mounted condition. This module has the best advantage of setting visibility when mounted in distribution boards and better than side mounted configuration.
[00012] An example of earth leakage module is recited in European patent 1261005, entitled, “Mechanism for an enclosed residual current-operated circuit breaker”. The patent discloses a mechanism, for an enclosed residual current-operated circuit breaker, has a relay provided with a piston adapted to act on a tripping mechanism, a handle for resetting the tripping mechanism and for acting on the piston of the relay in order to return it to the normal operating condition, a pre-adjusted elastic member arranged between the handle and the piston so that the force applied to the piston is set by means of the elastic member and does not depend on the force applied to the handle. Another example of protection circuit is recited in Chinese patent 102243957, entitled, “Moulded case circuit breaker with residual current protection”. The patent discloses a residual current protection with a moulded case circuit breaker, the device includes a base, contact interrupter module group, operating mechanism, residual current release, lid assembly, partitions, thermal magnetic release group, insulation, zero-sequence current transformer, leakage control unit, said contact interrupter module group fixed to the base, the operating mechanism fixed to the base and contact interrupter module group, the remaining current release mounted on the contact interrupter module group, and the drain is connected via a wire control assembly, the thermal-magnetic release set by each phase zero sequence current transformer located in contact interrupter module group and base Take electric wire holder, the leakage control assembly disposed between the thermal-magnetic release set and zero sequence current transformer, the leakage control components are connected to three-phase thermal magnetic release group, the said cover assembly is mounted on the base.
[00013] However in the conventional circuit breaker, the conventional design of a typical add-on earth leakage module demands separate earth leakage modules for a three pole breaker and a four pole breaker for a given frame size. This increases the number of components and hence increasing the tooling cost and making inventory management difficult in the assembly line. Further, in the conventional circuit breaker, the conventional layout of different configurations like bottom mounted, side mounted as well as conventional L shaped earth leakage module demands separate modules for circuit breaker of frame size of different depths as well as three pole and four pole versions of the same frame size. This increases the inventory at the assembly site which in turn increases complexity as well as tooling cost involved. Furthermore, in the existing circuit breaker, the conventional design of a typical add-on earth leakage module increases the variety of components required for three pole as well as four pole circuit breaker and through all the frame sizes. So, it will in turn increase the tooling cost incurred separately for earth leakage module for a three pole as well as four pole circuit breaker and for different frame sizes. The inventory management becomes difficult in the assembly line. Moreover, in the conventional design, the voltage tapped from line conductors of the circuit breaker on the line side is then fed for powering up of the microprocessor card. The microprocessor card includes settings like current settings, time settings, and trip indication. Conventionally, the voltage tapping means in the conventional layout involves use of voltage tapping wires with lug ends which are to be screwed to the phase conductors. Moreover, the routing of the voltage tapping wires also requires skilled workmanship. This increases complexity involved at the assembly line.
[00014] Whereas there is certainly nothing wrong with existing earth leakage module, nonetheless, there still exists a need to provide an efficient, effective, reliable, and improved module or mechanism to demonstrate the minimization of inventory and ease of the assembly in the assembly line, so as to prepare earth leakage modules for a three pole as well as four pole circuit breaker. Further, there is a need of a vent spacer and voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process.
[00015] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[00016] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about”. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[00017] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00018] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[00019] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

OBJECTS OF THE INVENTION
[00020] An object of the present disclosure is to provide a vent spacer and voltage tapping module for earth leakage add-on module for three poles and four pole moulded case circuit breaker of different frame sizes.
[00021] Another object of the present disclosure is to provide a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size.
[00022] Another object of the present disclosure is to provide an improved module or mechanism to demonstrate the minimization of inventory and ease of the assembly in the assembly line, so as to prepare earth leakage modules for a three pole as well as four pole circuit breakers.
[00023] Another object of the present disclosure is to provide a vent spacer and voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process.
[00024] Another object of the present disclosure is to provide a vent spacer which further extends use of modular L-shaped earth leakage module for circuit breakers of varying depths for both three pole as well as four pole versions.

SUMMARY
[00025] The present disclosure relates to the field of circuit breaker, and more specifically relates to, a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size.
[00026] Embodiments of the present disclosure provide an efficient, effective, reliable, improved circuit breaker. Further, a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size. In an embodiment, the present disclosure provides a vent spacer and a voltage tapping module for earth leakage add-on module for three pole and four pole molded case circuit breaker of different frame sizes.
[00027] Accordingly, an aspect of the present disclosure relates to a circuit breaker. In an aspect, the circuit breaker can include a modular vent spacer mounted substantially below an earth leakage module enabling use of said earth leakage module for said circuit breaker when configured at a plurality of depths. In another aspect, the earth leakage module can include a voltage tapping module to ensure safe assembly of said circuit breaker.
[00028] In an aspect, the modular vent spacer can be connected to the earth leakage module using at least three mechanical joining elements.
[00029] In an aspect, the modular vent spacer can be a modular vent spacer having four poles.
[00030] In an aspect, modular vent spacer having four poles is a convertible modular vent spacer having a knock-out feature adapted to enable conversion of said modular vent spacer having four poles into at least one other modular vent having three poles by knocking out a part of said convertible modular vent spacer.
[00031] In an aspect, the modular vent spacer can be a modular vent spacer having three poles.
[00032] In an aspect, the modular vent spacer can include a spacer feature adapted to act as a venting region of the circuit breaker.
[00033] In an aspect, earth leakage module can be a modular L-shaped three pole earth leakage module or a modular L-shaped three pole earth leakage module and can include at least a Circuit Breaker Coil Tester (CBCT) housing module and a card housing module.
[00034] In an aspect, CBCT housing module can include voltage tapping module having a voltage tapping wire routing casing and a voltage tapping wires with leaf spring arrangement
[00035] In an aspect, voltage tapping wire routing casing can be an L-shaped casing having a rib and is adapted to guide said voltage tapping wires from the line conductors of the circuit breaker. In another aspect, leaf spring arrangement can be placed in the pockets given in the CBCT housing module such that when said earth leakage module is connected along with the circuit breaker. In another aspect, the leaf springs for said arrangement can be adapted to make contact with the line conductors of the circuit breaker and the voltage is tapped and fed via. voltage tapping wires at least to a microprocessor.
[00036] In an aspect, voltage tapping wires along with said leaf spring arrangement can be routed around rib like walls in said voltage tapping wire-routing casing forming said voltage tapping module.
[00037] In contrast to the conventional circuit breaker, the present disclosure provides vent spacer which further extends use of modular L-shaped earth leakage module for circuit breakers of varying depths for both three pole as well as four pole versions. It adds variants with minimal of components and inventory and is an extended variant of the modular nature of L-shaped earth leakage module. The modular nature of the vent spacer extends modular nature of L-shaped earth leakage module for use along with circuit breaker of different depths including three-pole as well as four-pole variants. Further, in contrast to the existing circuit breaker, the present invention provides includes voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process. Moreover the module also enables the voltage tapping wires along with voltage tapping casing to be used as sub assembly, which has to be simply screwed with the earth leakage module. This module also ensures that the customer termination does not interfere with the voltage tapping wires. Furthermore, in contrast to the existing circuit breaker, the present invention in fact, adds variants with minimal of components and inventory and is an extended variant of the modular nature of L-shaped earth leakage module.
[00038] Further, in contrast to the existing conventional circuit breaker, the present invention provides a vent spacer and voltage tapping module for earth leakage add-on module for three poles and four pole moulded case circuit breaker of different frame sizes.
[00039] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[00040] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The diagrams are for illustration only, which thus is not a limitation of the present disclosure, and wherein:
[00041] FIG. 1 illustrates a modular vent spacer four pole version, in accordance with an exemplary embodiment of the present disclosure.
[00042] FIG. 2 illustrates a rear side of the modular vent spacer four pole versions, in accordance with another exemplary embodiment of the present disclosure.
[00043] FIG. 3 illustrates a modular vent spacer three pole version, in accordance with another exemplary embodiment of the present disclosure.
[00044] FIG. 4 illustrates a rear side of the modular vent spacer three pole versions, in accordance with another exemplary embodiment of the present disclosure.
[00045] FIG. 5 illustrates a modular L-shaped three pole earth leakage module (3) and modular L-shaped four pole earth leakage module (4) for a circuit breaker of depth D1, in accordance with another exemplary embodiment of the present disclosure.
[00046] FIG. 6 illustrates a modular L-shaped three pole earth leakage module (3) and modular L-shaped four pole earth leakage module (4) for a circuit breaker of depth D2, in accordance with another exemplary embodiment of the present disclosure.
[00047] FIG. 7 illustrates an exploded view of a modular L-shaped four pole earth leakage module, in accordance with another exemplary embodiment of the present disclosure.
[00048] FIG. 8 illustrates a CBCT housing module, in accordance with another exemplary embodiment of the present disclosure.
[00049] FIG. 9 illustrates a voltage tapping casing, in accordance with another exemplary embodiment of the present disclosure.
[00050] FIGs. 10-13 illustrate details of the CBCT housing module, in accordance with another exemplary embodiment of the present disclosure.
[00051] FIG. 14 illustrates a card housing module, in accordance with another exemplary embodiment of the present disclosure.
[00052] FIG. 15 illustrates an isolation-box module, in accordance with an exemplary embodiment of the present disclosure.
[00053] FIG. 16 illustrates isolation box in case of modular L shaped four pole earth leakage modules (4) for a four pole circuit breaker, in accordance with an exemplary embodiment of the present disclosure.
[00054] FIG. 17 illustrates an exploded view of isolation mechanism module, in accordance with an exemplary embodiment of the present disclosure.
[00055] FIG. 18 illustrates top cover for earth leakage module, in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[00056] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[00057] If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[00058] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00059] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. These exemplary embodiments are provided only for illustrative purposes and so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those of ordinary skill in the art. The invention disclosed may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Various modifications will be readily apparent to persons skilled in the art. The general principles defined herein may be applied to other embodiments and applications without departing from the scope of the invention. Moreover, all statements herein reciting embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure). Also, the terminology and phraseology used is for the purpose of describing exemplary embodiments and should not be considered limiting. Thus, the present invention is to be accorded the widest scope encompassing numerous alternatives, modifications and equivalents consistent with the principles and features disclosed. For purpose of clarity, details relating to technical material that is known in the technical fields related to the invention have not been described in detail so as not to unnecessarily obscure the present invention.
[00060] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[00061] All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[00062] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[00063] The present disclosure relates to the field of circuit breaker, and more specifically relates to, a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size.
[00064] Embodiments of the present disclosure provide an efficient, effective, reliable, improved circuit breaker. Further, a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size
[00065] Accordingly, an aspect of the present disclosure relates to a circuit breaker. In an aspect, the circuit breaker can include a modular vent spacer mounted substantially below an earth leakage module enabling use of said earth leakage module for said circuit breaker when configured at a plurality of depths. In another aspect, the earth leakage module can include a voltage tapping module to ensure safe assembly of said circuit breaker.
[00066] In an aspect, the modular vent spacer can be connected to the earth leakage module using at least three mechanical joining elements.
[00067] In an aspect, the modular vent spacer can be a modular vent spacer having four poles.
[00068] In an aspect, modular vent spacer having four poles is a convertible modular vent spacer having a knock-out feature adapted to enable conversion of said modular vent spacer having four poles into at least one other modular vent having three poles by knocking out a part of said convertible modular vent spacer.
[00069] In an aspect, the modular vent spacer can be a modular vent spacer having three poles.
[00070] In an aspect, the modular vent spacer can include a spacer feature adapted to act as a venting region of the circuit breaker.
[00071] In an aspect, earth leakage module can be a modular L-shaped three pole earth leakage module or a modular L-shaped three pole earth leakage module and can include at least a Circuit Breaker Coil Tester (CBCT) housing module and a card housing module.
[00072] In an aspect, CBCT housing module can include voltage tapping module having a voltage tapping wire routing casing and a voltage tapping wires with leaf spring arrangement
[00073] In an aspect, voltage tapping wire routing casing can be an L-shaped casing having a rib and is adapted to guide said voltage tapping wires from the line conductors of the circuit breaker. In another aspect, leaf spring arrangement can be placed in the pockets given in the CBCT housing module such that when said earth leakage module is connected along with the circuit breaker. In another aspect, the leaf springs for said arrangement can be adapted to make contact with the line conductors of the circuit breaker and the voltage is tapped and fed via voltage tapping wires at least to a microprocessor.
[00074] In an aspect, voltage tapping wires along with said leaf spring arrangement can be routed around rib like walls in said voltage tapping wire-routing casing forming said voltage tapping module.
[00075] In contrast to the conventional circuit breaker, the present disclosure provides vent spacer which further extends use of modular L-shaped earth leakage module for circuit breakers of varying depths for both three pole as well as four pole versions. It adds variants with minimal of components and inventory and is an extended variant of the modular nature of L-shaped earth leakage module. The modular nature of the vent spacer extends modular nature of L-shaped earth leakage module for use along with circuit breaker of different depths including three-pole as well as four-pole variants. Further, in contrast to the existing circuit breaker, the present invention provides includes voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process. Moreover the module also enables the voltage tapping wires along with voltage tapping casing to be used as sub assembly, which has to be simply screwed with the earth leakage module. This module also ensures that the customer termination does not interfere with the voltage tapping wires. Furthermore, in contrast to the existing circuit breaker, the present invention in fact, adds variants with minimal of components and inventory and is an extended variant of the modular nature of L-shaped earth leakage module.
[00076] Further, in contrast to the existing conventional circuit breaker, the present invention provides a vent spacer and voltage tapping module for earth leakage add-on module for three poles and four pole moulded case circuit breaker of different frame sizes.
[00077] For the simplicity of understanding of the subject matter, following reference numerals are used for associated/corresponding feature/elements of the proposed construction of a three pole or four pole L-shaped modular earth leakage module consists of the following:
1. A three pole circuit breaker
2. A four pole circuit breaker (of the same frame size as that of the three pole circuit breaker).
3. Modular L-shaped three pole earth leakage module
4. Modular L-shaped four pole earth leakage module
5. CBCT Housing module
6. Card Housing module
7. Isolation-box module
8. Core balanced current transformer assembly
9. Line conductors of a three/four pole circuit breaker
10. Voltage tapping means
11. Microprocessor card
12. Current settings and Time settings
13. Trip indication
14. Setting flapper
15. Isolation box
16. Plastic casing
17. Card cover
18. Self-tapping mechanical joining screw
19. Top cover for Modular L-shaped three pole earth leakage module
20. Top cover for Modular L-shaped four pole earth leakage module
21. Flapper for Modular L-shaped three pole earth leakage module
22. Flapper for Modular L-shaped four pole earth leakage module
23. Sub assembly of (6) card housing module and (7) isolation-box module.
24. Sub-assembly of (6) card housing module, (7) isolation-box module and CBCT housing module (5).
25. Sub assembly of (6) card housing module and (7) CBCT housing module (5).
The modular construction of a modular L-shaped four pole earth leakage module (4) configuration basically can include three main modules, namely the CBCT housing module (5), card housing module (6) and isolation box module (7).
[00078] Apart from the above, to specifically explain the proposed invention, below reference numerals are used for the components/feature directed toward specific novelty and advancement of the present invention.
31. Modular vent spacer four pole version
32. Modular vent spacer three pole version
33).Mechanical joining means for modular vent spacer
34. Leaf spring arrangement
35. Voltage tapping wires
36).Voltage tapping wire-routing casing
37).Voltage tapping module
[00079] In an embodiment, the modular nature of the vent spacer extends modular nature of L-shaped earth leakage module for use along with circuit breaker of different depths including three-pole as well as four-pole variants. The Modular vent spacer four pole version (31) can be mounted below the modular L-shaped four pole earth leakage module (4), enabling use of same modular L-shaped four pole earth leakage module (4) for a four pole circuit breaker (2) with different depth. The Modular vent spacer four pole versions (31) can be provided with three nos. of mechanical joining means, where the modular vent spacer four pole versions (31) can be joined by means of self-tapping screws with the modular L-shaped four pole earth leakage module (4). The knock-out feature given on an edge in the Modular vent spacer four pole version (31) enables converting modular vent spacer four pole version (31) into modular vent spacer three pole version (32) by knocking out a part of modular vent spacer four pole version (31). The modular vent spacer four pole versions (31) has features indicated by (31d), which will give rigidity and support to the structure. The space between the features (31d) is given for venting region of the circuit breaker. The modular vent spacer three pole version (32) is mounted below the modular L-shaped three pole earth leakage module enabling use of same modular L-shaped four pole earth leakage module (3) for a three pole circuit breaker (1) with different depth. The Modular vent spacer three pole versions (32) is provided with three nos. of mechanical joining means, where the modular vent spacer three pole version (32) will be joined by means of self-tapping screws with the modular L-shaped three pole earth leakage module (3). The Modular vent spacer three pole versions (32) has features indicated by (32d), which will give rigidity and support to the structure. The space between the features (32d) is given for venting region of the circuit breaker. The present invention, in fact, adds variants with minimal of components and inventory and is an extended variant of the modular nature of L-shaped earth leakage module. The CBCT housing module (5) houses the voltage tapping module (37) which includes the Voltage tapping wire-routing casing (36) and the voltage tapping wires (35) with leaf spring arrangement (34). The leaf spring arrangement (34) is placed in the pockets (5a) given in the CBCT housing module (5) and is such that when the earth leakage module (3, 4) is connected along with the circuit breaker (1, 2), the leaf springs will make contact with the line conductors of the circuit breaker and the voltage is tapped and fed via voltage tapping wires (35) to the microprocessor card (11). The voltage tapping casing (36) is an L-shaped casing which has rib like features as shown by (36b) provided on the bottom side as well as along the limb perpendicular to the base. The rib like walls will guide the voltage tapping wires (35) from the line conductors of the circuit breaker (1,2) till the tappings are terminated on electronic circuit board placed in isolation mechanism module (31). The rib like walls have tiny snap fits provided along its length so that the voltage tapping wires (35) can be snap fitted easily. For firm securing, some kind of rubber sealant can be used. The present invention includes voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process. Moreover the module also enables the voltage tapping wires along with voltage tapping casing to be used as sub assembly, which has to be simply screwed with the earth leakage module. This module also ensures that the customer termination does not interfere with the voltage tapping wires (35).
[00080] In an embodiment, the modular construction of ‘Isolation Mechanism’ module (31) can include :
26. Isolation Mechanism module Base casing
27. Isolation Mechanism module Top casing
28. Electronic circuit board carrying two sets of tapping points 28(a) and 28(b).
29. Switching Flapper
30. Phosphor bronze contacts
[00081] In an embodiment, there are two set of tappings put into an array like pattern on electronic circuit board. One set of tappings includes the power tappings taken from the line conductors of the circuit breaker via voltage tapping means which includes arrangement of leaf spring in various shapes. These tappings are then terminated on set of specified points on the electronic circuit board. The other set of tappings include the tappings taken from another set of points arranged along the first set of points on Electronic circuit board (28) to the microprocessor card and electronic circuits connected in conjunction with the microprocessor card for the purpose of current settings, time settings, trip indication etc. The Electronic circuit board (28) also have grooves cut along the array of two set of tappings given for meeting clearance and creepage requirements during line and test conditions. The Isolation mechanism module Base casing (26) has grooves cut in similar fashion as in electronic circuit board. The Isolation Mechanism module Top casings (27) are provided with thin walled structures. These walls are built in a pattern to get accommodated in the grooves cut in the Electronic circuit board (28) and then into the cut features provided in Isolation Mechanism module Base casing (26). The Electronic circuit board (28) is housed in the Isolation Mechanism module Base casing (26). The Isolation Mechanism module Base casing (26) is hinged with the Isolation Mechanism module Top casing (27) and is assembled over the Isolation Mechanism module Base casing (26). A set of electrical contacts (30) made of phosphor bronze alloy is arranged on a Switching Flapper (29) component. The Switching Flapper (29) with electrical contacts (30) arrangement is hinged around the isolation mechanism casing assembly and can stay intact with the isolation mechanism module. When the Isolation Mechanism module Base casing (26) and top casing are assembled together, the wall structures of the isolation mechanism top casing accommodates in grooves cut in Electronic circuit board (28) and Isolation Mechanism module Base casing (26) and provides the required clearances and creepage that are to be provided between the two set of tapping terminated on the electronic circuit board. In normal working conditions, when the Switching Flapper (29) is closed, the set of electrical contacts (30) made of phosphor bronze alloy completes the electric circuit path between the two set of tappings. The voltage tapped from the line conductors of the circuit breaker are basically fed to power up the microprocessor card and electronic circuits connected in conjunction with the microprocessor card for the purpose of current settings, time settings, trip indication etc. While performing Dielectric voltage withstand test on the circuit breaker critical for electrical safety testing, the Switching Flapper (29) is opened up, thus the electrical contacts (30) disengages with two set of tapping, thus electrically isolating the two, that is the circuit breaker under test and microprocessor card and relays which are in conjunction with the microprocessor card. The construction of the isolation mechanism module (31) is such that the required clearances and creepage are met both under live and test conditions. The isolation mechanism module (31) can be screwed joined to the isolation-box module, in case of Modular L-shaped four pole earth leakage module for a four pole circuit breaker. The isolation mechanism module (31) can be screwed joined to the CBCT Housing module (5), in case of Modular L shaped three pole earth leakage modules for three pole circuit breaker. The Switching Flapper (29) of the isolation mechanism module (31) will be accessed through the window given in top cover. The Switching Flapper (29) is hinged and will stay intact with the isolation mechanism module. During the dielectric test, the Switching Flapper (29) has to be opened around the hinge given in isolation mechanism module (31) and will stay intact with the Top cover for Modular L-shaped three pole earth leakage module / four pole earth leakage modules during the dielectric voltage withstand test.
[00082] The present invention involves use of modular isolation mechanism which will ensure that the Switching Flapper (29) carrying third set of contacts have to just be opened around the hinge axis on isolation mechanism module (31) and thus will stay physically along with the circuit breaker in mounted condition. There will be no misplacement of any of the plastic component carrying contacts or mechanical joining hardware and hence ensures smooth testing and functioning of the circuit breaker along with the earth leakage module. The present invention of modular construction of the isolation mechanism module (31) also ensures that this module can be used across all frame sizes alike and irrespective of the whether the add-on module will go along with a three pole or a four pole circuit breaker. So, it will in turn minimize the tooling cost which could have been incurred separately for earth leakage module for a three pole as well as four pole circuit breaker and for different frame sizes. The inventory management will be easier in the assembly line. The modular L-shaped earth leakage (3,4) module consists of :
5. CBCT Housing module
6. Card housing module
7. Isolation-box module
8. Core balanced current transformer
23. Sub assembly of (6) card housing module and (7) isolation-box module.
Sub-assembly of (6) card housing module, (7) isolation-box module and CBCT housing module (5).
Sub assembly of (6) card housing module and (7) CBCT housing module (5).
The three pole Modular L-shaped earth leakage module (7) can be assembled by assembling:
5. CBCT Housing module
6. Card housing module
8. Core balanced current transformer
Sub assembly of (6) card housing module and (7) CBCT housing module (5)
Here, the isolation-box module (7) will be assembled inside the CBCT hosing module (5).
[00083] The four pole Modular L-shaped earth leakage module (8) can be assembled by assembling:
5. CBCT Housing module
6. Card housing module
7. Isolation-box module
8. Core balanced current transformer
23. Sub assembly of (6) card housing module and (7) isolation-box module.
Sub-assembly of (6) card housing module, (7) isolation-box module and CBCT housing module (5).
Sub assembly of (6) card housing module and (7) CBCT housing module (5).
[00084] The elongated protrusion features given in the card housing module (6) are used to slide through similar groove cut feature given in the CBCT housing module (5) in case of assembly of three pole Modular L-shaped earth leakage modules (7). The elongated protrusion features given in the card housing module (6) are used to slide through similar groove cut feature given in the Isolation-box module (7) in case of assembly of four pole Modular L-shaped earth leakage module (8). There is interlocking feature given in the elongated protrusions of the card housing module (6) which ensures that the CBCT housing module (5) in case of assembly of three pole Modular L-shaped earth leakage module (7) will remain secured in its final assembled position and prevent the CBCT housing module (5) from falling apart. There is interlocking feature given in the elongated protrusions of the card housing module (6) which ensures that the Isolation-box module (7) in case of assembly of four pole Modular L-shaped earth leakage module will remain secured in its final assembled position and prevent the Isolation-box module (7) from falling apart. The wedge feature given in the Isolation-box module (7) is used to clamp on the walls of the CBCT housing module (5) in case of assembly of four pole Modular L-shaped earth leakage modules (8). The CBCT housing (5) has knock out feature which will be knocked out, in case four pole Modular L-shaped earth leakage module (8) is being assembled so as to integrate the internal elements in the CBCT housing module (5), card housing module (6) as well as isolation-box module (7). The CBCT housing (5) has knock out feature which will remain secure and intact by some means like factory seal, label, sticker, etc. in of three pole Modular L-shaped earth leakage module (7) is being assembled as this will be the part of the outside facia of Modular L-shaped three pole earth leakage module (3). The card housing module (6) has features on its bottom surface to secure the microprocessor card (11) at the bottom. The card cover (17) will have features to secure the microprocessor card (11) at the top. The top cover (19, 20) for three pole and four pole Modular L-shaped earth leakage module (7), (8) respectively has window which has a flapper .The purpose of the window given in top cover is to have better view while terminating cables at customer end. The isolation box will be accessed through the window given in top cover (19, 20) for three pole and four pole Modular L shaped earth leakage module (7), (8) respectively. The modular construction of L-shaped module configuration gives advantage over conventional L-shaped module, with respect to the fact that the same modules can be configured differently to form earth leakage modules for a three pole circuit breaker as well as four pole circuit breaker. Connecting modules in the sequence as explained in the description and images, earth leakage modules for three and four pole can be assembled. The assembly being modular, it is easy to replace the defective module on line, instead of entire module. Minimal tooling cost required for development of earth leakage modules for three pole as well as four pole circuit breaker. Easy inventory management on the assembly line.
[00085] FIG. 1 illustrates a modular vent spacer four pole version, in accordance with an exemplary embodiment of the present disclosure.
[00086] The Modular vent spacer four pole version (31) can be mounted below the modular L-shaped four pole earth leakage module (4), enabling use of same modular L-shaped four pole earth leakage module (4) for a four pole circuit breaker (2) with different depth.
[00087] The Modular vent spacer four pole versions (31) can be provided with three nos. of mechanical joining means shown by (31a), where the modular vent spacer four pole versions (31) can be joined by means of self-tapping screws with the modular L-shaped four pole earth leakage module (4). The features shown by (31b) is the mounting hole location which is in line with the mounting hole location given in L-shaped four pole earth leakage module (4).
[00088] The knock-out feature is given in the Modular vent spacer four pole version (31) shown by feature (31c). It enables converting Modular vent spacer four pole versions (31) into Modular vent spacer three pole version (32) by knocking out a part of Modular vent spacer four pole versions (31).
[00089] FIG. 2 illustrates a rear side of the modular vent spacer four pole versions, in accordance with another exemplary embodiment of the present disclosure.
[00090] FIG. 2 shows the rear side of the modular vent spacer four pole versions (31). The modular vent spacer four pole versions (31) has features indicated by (31d), which will give rigidity and support to the structure. The space between the features (31d) is given for venting region of the circuit breaker. As it is clearly seen, the knock out feature shown by (31c) is clearly given on an edge, such that knocking out a part of the modular vent spacer four pole versions (31) will easily convert into Modular vent spacer three pole versions (32).
[00091] FIG. 3 illustrates a modular vent spacer three pole version, in accordance with another exemplary embodiment of the present disclosure.
[00092] FIG. 3 shows modular vent spacer three pole versions (32). The Modular vent spacer three pole version (32) can be mounted below the modular L-shaped three pole earth leakage module (3), enabling use of same modular L-shaped four pole earth leakage module (3) for a three pole circuit breaker (1) with different depth. The Modular vent spacer three pole versions (32) can be provided with three nos. of mechanical joining means shown by (32a), where the modular vent spacer three pole versions (32) will be joined by means of self-tapping screws with the modular L-shaped three pole earth leakage module (3). The features shown by (32b) is the mounting hole location which is in line with the mounting hole location given in L-shaped three pole earth leakage module(3). Basically, the features shown by (31b) and (31c) of four pole version are the same as (32b) and (32c) of three pole version.
[00093] FIG. 4 illustrates a rear side of the modular vent spacer three pole versions, in accordance with another exemplary embodiment of the present disclosure.
[00094] FIG. 4 shows the rear side of the Modular vent spacer three pole versions (32). The Modular vent spacer three pole versions (32) has features indicated by (32d), which will give rigidity and support to the structure. The space between the features (32d) is given for venting region of the circuit breaker.
[00095] FIG. 5 illustrates a modular L-shaped three pole earth leakage module (3) and modular L-shaped four pole earth leakage module (4) for a circuit breaker of depth D1, in accordance with another exemplary embodiment of the present disclosure.
[00096] FIG. 6 illustrates a modular L-shaped three pole earth leakage module (3) and modular L-shaped four pole earth leakage module (4) for a circuit breaker of depth D2, in accordance with another exemplary embodiment of the present disclosure.
[00097] FIG. 6 shows a modular L-shaped three pole earth leakage module (3) and modular L-shaped four pole earth leakage module (4) for a circuit breaker of depth D2. This is possible with incorporation of a vent spacer three pole version (32) and vent spacer four pole version (31).
[00098] FIG. 7 illustrates an exploded view of a modular L-shaped four pole earth leakage module, in accordance with another exemplary embodiment of the present disclosure.
[00099] In an embodiment, in case of Modular L-shaped four pole earth leakage module (4) for a four pole circuit breaker(2), the CBCT housing module (5), the card housing module (6) and the isolation-box module (7) can be integrated by means of slide fit and screw joining. In case of Modular L-shaped three pole earth leakage module (3) for a three pole circuit breaker(1), the CBCT housing module (5) and the card housing module (6) can be integrated by means of slide fit and screw joining. The isolation-box module (7) cannot be included. In this case, the isolation mechanism module can be arranged in the CBCT housing module (5). The CBCT housing module (5) houses the core balanced current transformer assembly (8).
[000100] FIG. 8 illustrates a CBCT housing module, in accordance with another exemplary embodiment of the present disclosure.
[000101] As shown in FIG. 8, The CBCT housing module (5) houses the voltage tapping module (37) which includes the voltage tapping wire routing casing (36) and the voltage tapping wires (35) with leaf spring arrangement (34).
[000102] FIG. 9 illustrates a voltage tapping casing, in accordance with another exemplary embodiment of the present disclosure.
[000103] As shown in FIG. 9, the voltage tapping wire-routing casing (36) can be screwed to the CBCT housing module (5) at points indicated by (36a). FIG. 9 depicts, the voltage tapping casing (36) is an L-shaped casing which have rib like features as shown by (36b) provided on the bottom side as well as along the limb perpendicular to the base. The rib like walls can guide the voltage tapping wires (35) from the line conductors of the circuit breaker (1,2) till the tappings are terminated on electronic circuit board placed in isolation mechanism module (31). The rib like walls have tiny snap fits provided along its length so that the voltage tapping wires (35) can be snap fitted easily. For firm securing, some kind of rubber sealant can be used.
[000104] FIGs. 10-13 illustrate details of the CBCT housing module, in accordance with another exemplary embodiment of the present disclosure.
[000105] The leaf spring arrangement (34) can be placed in the pockets (5a) given in the CBCT housing module (5) as shown in FIG. 10 and is such that when the earth leakage module (3, 4) can be connected along with the circuit breaker (1, 2), the leaf springs can make contact with the line conductors of the circuit breaker and the voltage is tapped and fed via voltage tapping wires (35) to the microprocessor card (11). The voltage tapping wires (35) along with leaf spring arrangement (34) can be routed around the rib like walls given by (36b) in the voltage tapping wire-routing casing (36) and this subassembly can be called as voltage tapping module (37).
[000106] The present invention includes voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process. Moreover the module also enables the voltage tapping wires along with voltage tapping casing to be used as sub assembly, which has to be simply screwed with the earth leakage module. This module also ensures that the customer termination does not interfere with the voltage tapping wires (35).
[000107] FIGs. 10-13 show details of the CBCT housing module (5). The module (5) has an elongated feature (5b) along its depth so as to engage with the circuit breaker. This serves as mechanical joining between the earth leakage module (3, 4) as well as the circuit breaker (1, 2) respectively. Also, it helps in meeting the necessary clearance and creepage requirements as per the standards. This elongated feature also has T-provision (5c) on its upper end, which locks the earth leakage module (3, 4) in position and prevents its translational motion along height direction of a circuit breaker (1, 2). In addition to this, the module (5) also has a hexagonal feature (5d) as seen in Figure 10 which engages with the slot in the circuit breaker (1, 2). This again helps in preventing the translational motion along height direction of a circuit breaker (1, 2).
[000108] The CBCT housing module (5) along with the voltage tapping module (37) ensures that the voltage tapping wires (35) or conductors or strips whichever used are intact and shielded by means of voltage tapping wire-routing casing (36). The CBCT housing module (5) has slot (5f) as shown in FIG. 11 to accommodate the core balanced current transformer (8). The core balanced current transformer (8) is designed considering termination required for a four pole circuit breaker (2). The same core balanced current transformer (8) is being used in modular L-shaped three pole earth leakage module (3) for a three pole circuit breaker (1) as shown in FIG. 7. The CBCT housing module (5) has knockout feature (5g) as shown in the FIG. 10. In case of modular L shaped four pole earth leakage module(4) for a four pole circuit breaker (2), the feature (5g) will be knocked out before the assembly, as shown in FIG. 13 so as to integrate the internal elements in the CBCT housing module (5), card housing module (6) as well as isolation-box module (7). In case of a modular L-shaped three pole earth leakage module (3) for a three pole circuit breaker (1), the CBCT housing module (5) will be used as it is, with the feature (5g) intact and secured by some means, say like factory seal, label, sticker etc. as this will be the part of the outside facia of modular L-shaped three pole earth leakage module (3).
[000109] Whenever Modular L-shaped three pole earth leakage module (3) can be configured for a three pole circuit breaker (1), the voltage tapping means (10) for the fourth pole will not be assembled in the CBCT housing module (5). Also, the hexagonal feature (5d) given in the fourth pole of CBCT housing module (5) can be accommodated inside the card housing module (6).
[000110] FIG. 14 illustrates a card housing module, in accordance with another exemplary embodiment of the present disclosure.
[000111] The card housing module (6) houses the microprocessor card (11) which includes settings like current settings (12), time settings (13), trip indication(14) etc. The microprocessor card (11) as shown in FIG. 14 has a slot (11a) and is placed vertically in the card housing module (6) and is constrained in the breaker’s (1,2) width-height direction at the bottom side by means of locking feature (6a) given in the card housing module (6) as seen in FIG. 14.
[000112] FIG. 15 illustrates an isolation-box module, in accordance with an exemplary embodiment of the present disclosure.
[000113] On the top side too, the microprocessor card (11) has a slot (11b), which gets locked by means of feature (17a) given in the card cover (17) as shown in FIG. 15. This constrains the microprocessor card (11) along the depth of the breaker (1, 2).
[000114] FIG. 16 illustrates isolation box in case of modular L shaped four pole earth leakage modules (4) for a four pole circuit breaker, in accordance with an exemplary embodiment of the present disclosure.
[000115] In case of modular L-shaped four pole earth leakage module (4), the feature (6b) of card housing module (6) slides through the feature (7a) of the isolation-box module (7) and gets locked by T-shaped feature given in the feature (6c) of the card housing module (6). On sliding the isolation-box module (7) over the card housing module (6), the feature (6d) of card housing module (6) can come under the feature (7b) given in the isolation-box module (7). Then the hole-feature (6d) in card housing module (6) will lie in the same axis as that of the hole-feature (7c) of the isolation-box module (7). Now, a sub-assembly (23) of card housing module (6) and isolation-box module (7) will be formed. Then the inverted L-shaped feature (7d) and (7d’) of the isolation-box module as shown in FIG. 16 can be clamped over the walls of the CBCT housing module (5) and the subassembly (24) consisting of (6) card housing module, (7) isolation-box module and CBCT housing module (5) will be formed. Now, the card cover (17) can be assembled over the card housing module (6) with the feature (17c) lying axially with (6d) of card housing module and (7c) of isolation-box module (7). Self-tapping mechanical joining screw (18) is provided through features (17b) and (6e) to engage respectively the card cover (17) and card housing module (6).
[000116] FIG. 18 illustrates top cover for earth leakage module, in accordance with an exemplary embodiment of the present disclosure.
[000117] Now, top cover for Modular L-shaped four pole earth leakage module (20) can be assembled over the above assembly. A self-tapping mechanical joining screw (18) is provided to engage the top cover (20), card housing module (6), card cover (17) and isolation-box module (7). The isolation-box module (7), as seen in FIG. 16 houses the isolation box (15) only in case of Modular L shaped four pole earth leakage modules (4) for a four pole circuit breaker (2) which was described previously. The isolation-box module (15) is not connected in case of a Modular L-shaped three pole earth leakage module (3) for a three pole circuit breaker (1). In case of Modular L-shaped three pole earth leakage module (3) for three pole circuit breaker (1) , the features (7a) as shown by in isolation-box module (7) will be given by (5h) in the CBCT housing module (5) as shown by in FIG. 12. Similarly, features (7b) and (7c) of isolation-box module (7) as shown in Fig. 16 can be provided by (5j) and (5k) of the CBCT housing module (5) as Fig.12.
[000118] The features (5h), (5j) and (5k) however will not serve any purpose only in case of Modular L-shaped four pole earth leakage module (4) for four pole circuit breaker (2) as shown in FIG. 12. Now, the feature (6b) of card housing module (6) slides through the feature (5h) of the CBCT housing module (5) and gets locked by T-shaped feature given in the feature (6c) of the card housing module (6).
[000119] On sliding the CBCT housing module (5) over the card housing module (6), the feature (6d) of card housing module (6) can come under the feature (5j) given in CBCT housing module (5) .Then the hole-feature (6d) in card housing module (6) will lie in the same axis as that of the hole-feature (5k) of the CBCT housing module (5) .Now, a sub-assembly (25) of card housing module (6) and CBCT housing module (5) will be formed.
[000120] Now, the card cover (17) will be assembled over the card housing module (6) with the feature (17c) lying axially with (6d) of card housing module and (5k) of CBCT housing module (5) .Self-tapping mechanical joining screw (18) is provided through features (17b) and (6e) to engage respectively the card cover (17) and card housing module (6). FIG. 17 shows the exploded view of isolation mechanism module (31).The isolation-box module (7) houses the isolation mechanism module (31). The isolation mechanism module (31) houses the ‘isolation mechanism’ as shown in FIG. 16. The isolation mechanism consists of two set of tappings brought to an array on electronic circuit board (28): Power tappings (28a) from the line conductors of the circuit breaker (1, 2) via voltage tapping means which includes arrangement of leaf spring in various shapes and terminated on set of specified points on an electronic circuit board (28). Tappings (28b) arranged along the first set of points on electronic circuit board (28) to the microprocessor card (11) and electronic circuits connected in conjunction with the microprocessor card (28) for the purpose of current settings (12a), time settings (12b), trip indication (13) etc. The Switching Flapper (29) with electrical contacts (30) arrangement is hinged around the isolation mechanism casing assembly and can stay intact with the isolation mechanism module. The Electronic circuit board (28) and Isolation mechanism module Base casing (26) have grooves cut along the array of two set of tappings given for meeting clearance and creepage requirements during line and test conditions. The Isolation Mechanism module Top casing (27) are provided with thin walled structures, built in a pattern to get accommodated in the grooves cut in the Electronic circuit board (28) and then into the cut features provided in Isolation Mechanism module Base casing (26). It provides the required clearances and creepage that are to be provided between the two set of tapping terminated on the electronic circuit board. In normal working conditions, when the Switching Flapper (29) is closed, the set of electrical contacts (30) made of phosphor bronze alloy completes the electric circuit path between the two set of tappings. The voltage tapped from the line conductors of the circuit breaker are basically fed to power up the microprocessor card and electronic circuits connected in conjunction with the microprocessor card for the purpose of current settings, time settings, trip indication etc. While performing Dielectric voltage withstand test on the circuit breaker critical for electrical safety testing, the Switching Flapper (29) is opened up, thus the electrical contacts (30) disengages with two set of tapping, thus electrically isolating the two, that is the circuit breaker under test and microprocessor card and relays which are in conjunction with the microprocessor card. The construction of the isolation mechanism module (31) is such that the required clearances and creepage are met both under live and test conditions. The isolation mechanism module (31) can be screwed joined to the card housing module (6), in case of Modular L-shaped four pole earth leakage module for a four pole circuit breaker and to the CBCT Housing module (5), in case of Modular L-shaped three pole earth leakage module for three pole circuit breaker. It ensures that the Switching Flapper (29) will stay physically along with the circuit breaker in mounted condition. There will be no misplacement of any of the plastic component carrying contacts or mechanical joining hardware and hence ensures smooth testing and functioning of the circuit breaker along with the earth leakage module Now, top cover for Modular L-shaped three pole earth leakage module (19) will be assembled over the above assembly. A self-tapping mechanical joining screw (18) is provided to engage the top cover (20), card housing module (6), card cover (17) and CBCT housing module (5). FIG. 18 shows the top cover (19, 20) which is different for earth leakage modules (3, 4) for both three pole (1) as well as four pole circuit breaker (2). The top cover (19),(20), as one can see has corresponding windows (19a),(20a) which has a flapper (21),(22) respectively as shown .The purpose of the window given in top cover is to have better view while terminating cables at customer end. The Switching Flapper (29) of the isolation mechanism module (31) can be accessed through the window (19b), (20b) given in top cover (19), (20) respectively.
[000121] The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.
[000122] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc. The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the appended claims.
[000123] While embodiments of the present disclosure have been illustrated and described, it will be clear that the disclosure is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the scope of the disclosure, as described in the claims.
[000124] In the description of the present specification, reference to the term "one embodiment," "an embodiments", "an example", "an instance", or "some examples" and the description is meant in connection with the embodiment or example described The particular feature, structure, material, or characteristic included in the present invention, at least one embodiment or example. In the present specification, the term of the above schematic representation is not necessarily for the same embodiment or example. Furthermore, the particular features structures, materials, or characteristics described in any one or more embodiments or examples in proper manner. Moreover, those skilled in the art can be described in the specification of different embodiments or examples are joined and combinations thereof.
[000125] All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
[000126] Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
[000127] The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
[000128] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION
[000129] The present disclosure provides a vent spacer and voltage tapping module for earth leakage add-on module for three poles and four pole moulded case circuit breaker of different frame sizes.
[000130] The present disclosure provides a vent spacer and voltage tapping module for use of same earth leakage module for same frame size of different depths and at the same time for a three pole and four pole configuration of same frame size.
[000131] The present disclosure provides an improved module or mechanism to demonstrate the minimization of inventory and ease of the assembly in the assembly line, so as to prepare earth leakage modules for a three pole as well as four pole circuit breaker.
[000132] The present disclosure provides a vent spacer and voltage tapping module which ensures that the voltage tapping wires are routed properly from the start till end point, along the voltage tapping casing, thus ensuring clean and safe assembly process.
[000133] The present invention provides a vent spacer which further extends use of modular L-shaped earth leakage module for circuit breakers of varying depths for both three pole as well as four pole versions.