Claims:1. A circuit breaker (10) comprising:
a chassis (43) coupled with a breaking unit (42); and
one or more fixed contacts (85, 86);
wherein said breaking unit (42) comprises one or more breaking units (42a, 42b, 42c) coupled together using respective hexagonal head bolts (56a, 56b, 56c, 56d); and
wherein said fixed contacts (85, 86) comprise one or more adhesive components (103a, 103b, 104) that are provided on respective one or more surfaces, said one or more adhesive components being configured to seal said one or more surfaces so as to prevent leakage of pressurized gases and maintain dielectric strength of the circuit breaker (10).

2. The circuit breaker (10) as claimed in claim 1, wherein said hexagonal head bolts (56a, 56b, 56c, 56d) are fastened with respective hexagonal nuts (57a, 57b, 57c, 57d).

3. The circuit breaker (10) as claimed in claim 1, wherein said adhesive components (103a, 103b, 104) are silicon rubber adhesives.

4. The circuit breaker (10) as claimed in claim 3, wherein said silicon rubber adhesives comprise one or more properties selected from any or combination of a maximum service temperature at 90 degree Celsius, high strength during and after short circuit at high voltages, ability to bond different materials, sealing property.

5. The circuit breaker (10) as claimed in claim 1, wherein said adhesive components (103a, 103b, 104) are adapted to seal an escape path of said pressurized gases and hold one or more cassettes (81, 82) together thereby preventing a breaking unit (42a), from one or more breaking units (42a, 42b, 42c), from opening during short circuit at high voltages.

6. The circuit breaker (10) as claimed in claim 1, wherein one or more breaking units (42a, 42b, 42c) further comprises one or more vents (98a, 98b) to allow escape of ionized highly pressurized gas.

7. The circuit breaker (10) as claimed in claim 1, wherein one or more breaking units (42a, 42b, 42c) comprises one or more vents (98a, 98b) to allow escape of ionized highly pressurized gas, wherein said one or more vents (98a, 98b) sealed by said adhesive components from one or more surfaces so as to prevent leakage of pressurized gases and maintain dielectric strength of the circuit breaker between basic breaker unit (40) and ETU (20) so prevent phase cross-over in case of reverse supply.
, Description:TECHNICAL FIELD
[0001] The present disclosure relates to the field of circuit breaker, and more specifically relates to, a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.

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] The invention will be illustrated with particular reference to a preferred application in a low-voltage electrical power distribution network, although this is not to be understood as limiting, and in any event the invention applies in general to both medium and low-voltage networks.
[0004] 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.
[0005] 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.
[0006] Circuit breakers are designed to have a breaking capacity which is also known as a rated service breaking capacity or Ics that specifies a maximum theoretical current which circuit breaker can withstand with respect to minimum let through energies (I2t) and withstand energies (VIdt). It is not only withstanding it once, but also in repeatable and safer manner that does not cause damage to the physical or operational aspect the circuit breaker. For example, a circuit breaker can have a rated service short circuit breaking capacity of 50kAmp at maximum voltage of 690V or 750V. But this rating would not be sufficient for installations with high voltage breaking capacity such as marines, solar panel grid suppliers, information technology installations which can have current availability up to 30-36 kAmp at a maximum voltage of 800V-1000V.
[0007] In current scenarios, the requirement of foot print of panels and indirectly breakers are reducing day-by-day. Also some installations like Marines, space constraints inherently limit the maximum overall dimension of breakers. Hence, to increase high voltage breaking capacity the overall volume or size of the breakers can’t be changed. Also with improvement of breaking capacity for higher voltages (690V-800V-1000V) the circuit breaker have to still meet or exceed stringent standards (IS - IEC), concerning mechanical strength, dielectric strength and temperature rise.
[0008] Whereas there is certainly nothing wrong with existing circuit breaker, nonetheless, there still exists a need to provide an efficient, effective, reliable, and improved module or mechanism to increase or to achieve breaking capacities at high voltages (for example, more than 690V) without increasing the physical dimensions or weight of an existing design of relatively low voltage circuit breaker. Further, there is a need of a circuit breaker having an increased interrupting rating at high voltages without increasing the size of the circuit breaker while maintaining full compliance with standards.
[0009] 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.
[00010] 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.
[00011] 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.
[00012] 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.
[00013] 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
[00014] An object of the present disclosure is to provide a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.
[00015] Another object of the present disclosure is to provide an arrangement or mechanism for improved breaking capacities at high voltages.
[00016] Another object of the present disclosure is to provide an improved module or mechanism to increase or to achieve breaking capacities at high voltages (more than 690V) without increasing the physical dimensions or weight of an existing design of relatively low voltage circuit breaker.
[00017] Another object of the present disclosure is to provide a circuit breaker having an increased interrupting rating at high voltages without increasing the size of the circuit breaker while maintaining full compliance with standards.

SUMMARY
[00018] The present disclosure relates to the field of circuit breaker, and more specifically relates to, a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.
[00019] Embodiments of the present disclosure provide an efficient, effective, reliable, improved circuit breaker. Further, a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.
[00020] Accordingly, an aspect of the present disclosure relates to a circuit breaker. In an aspect, the circuit breaker can include a chassis, a breaking unit and one or more fixed contacts. In another aspect, the chassis can be coupled with a breaking unit. In another aspect, breaking unit can include one or more breaking units coupled together using respective hexagonal head bolts. In another aspect, fixed contacts can include one or more adhesive components that are provided on respective one or more surfaces, said one or more adhesive components being configured to seal said one or more surfaces so as to prevent leakage of pressurized gases and maintain dielectric strength of the circuit breaker.
[00021] In an aspect, hexagonal head bolts can be fastened with respective hexagonal nuts.
[00022] In an aspect, adhesive components can be silicon rubber adhesives.
[00023] In an aspect, silicon rubber adhesives can include one or more properties selected from any or combination of a maximum service temperature at 90 degree Celsius, high strength during and after short circuit at high voltages, ability to bond different materials, sealing property.
[00024] In an aspect, adhesive components can be adapted to seal an escape path of said pressurized gases and hold one or more cassettes together thereby preventing a breaking unit, from one or more breaking units, from opening during short circuit at high voltages.
[00025] In an aspect, one or more breaking units further can include one or more vents to allow escape of ionized highly pressurized gases.
[00026] In an aspect, one or more breaking units comprises one or more vents to allow escape of ionized highly pressurized gas, wherein said one or more vents sealed by said adhesive components from one or more surfaces so as to prevent leakage of pressurized gases and maintain dielectric strength of the circuit breaker between basic breaker unit and ETU so prevent phase cross-over in case of reverse supply.
[00027] In contrast to the conventional circuit breaker, the present disclosure provides a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities. Further, in contrast to the existing circuit breaker, the present invention provides an efficient, effective, reliable, and improved module or mechanism to increase or to achieve breaking capacities at high voltages (more than 690V) without increasing the physical dimensions or weight of an existing design of relatively low voltage circuit breaker. Furthermore, in contrast to the existing circuit breaker, the present invention provides a circuit breaker having an increased interrupting rating at high voltages without increasing the size of the circuit breaker while maintaining full compliance with standards.
[00028] Further, in contrast to the conventional circuit breakers which can increase breaking capacity at particular 690V, the present invention facilitates increase breaking capacity (voltages) for more than 690V, and specifically 800V and 1000V for which breakers has been designed and given for installation too.
[00029] 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
[00030] 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:
[00031] FIG. 1 illustrates a molded case circuit breaker (MCCB), in accordance with an exemplary embodiment of the present disclosure.
[00032] FIG. 2 illustrates a MCCB having an operating handle, in accordance with another exemplary embodiment of the present disclosure.
[00033] FIG. 3 illustrates a MCCB with a breaker skin coupled with front cover, in accordance with another exemplary embodiment of the present disclosure.
[00034] FIG. 4 illustrates a MCCB with a front cover, in accordance with another exemplary embodiment of the present disclosure.
[00035] FIG. 5 illustrates a MCCB with IP cover held by an operating handle, in accordance with another exemplary embodiment of the present disclosure.
[00036] FIG. 6 illustrates a MCCB with Individual basic breaking units, in accordance with another exemplary embodiment of the present disclosure.
[00037] FIG. 7 illustrates a MCCB with diametrically opposite side of rotating contact, in accordance with another exemplary embodiment of the present disclosure.
[00038] FIGs. 8-11 illustrate an exemplary working of proposed MCCB, in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[00039] 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.
[00040] 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.
[00041] 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.
[00042] 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.
[00043] 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.
[00044] 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.
[00045] 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.
[00046] The present disclosure relates to the field of circuit breaker, and more specifically relates to, a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.
[00047] Embodiments of the present disclosure provide an efficient, effective, reliable, improved circuit breaker. Further, a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.
[00048] Accordingly, an aspect of the present disclosure relates to a circuit breaker. In an aspect, the circuit breaker can include a chassis, a breaking unit and one or more fixed contacts. In another aspect, the chassis can be coupled with a breaking unit. In another aspect, breaking unit can include one or more breaking units coupled together using respective hexagonal head bolts. In another aspect, fixed contacts can include one or more adhesive components that are provided on respective one or more surfaces, said one or more adhesive components being configured to seal said one or more surfaces so as to prevent leakage of pressurized gases and maintain dielectric strength of the circuit breaker.
[00049] In an aspect, hexagonal head bolts can be fastened with respective hexagonal nuts.
[00050] In an aspect, adhesive components can be silicon rubber adhesives.
[00051] In an aspect, silicon rubber adhesives can include one or more properties selected from any or combination of a maximum service temperature at 90 degree Celsius, high strength during and after short circuit at high voltages, ability to bond different materials, sealing property.
[00052] In an aspect, adhesive components can be adapted to seal an escape path of said pressurized gases and hold one or more cassettes together thereby preventing a breaking unit, from one or more breaking units, from opening during short circuit at high voltages.
[00053] In an aspect, one or more breaking units further can include one or more vents to allow escape of ionized highly pressurized gases.
[00054] In contrast to the conventional circuit breaker, the present disclosure provides a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities. Further, in contrast to the existing circuit breaker, the present invention provides an efficient, effective, reliable, and improved module or mechanism to increase or to achieve breaking capacities at high voltages (more than 690V) without increasing the physical dimensions or weight of an existing design of relatively low voltage circuit breaker. Furthermore, in contrast to the existing circuit breaker, the present invention provides a circuit breaker having an increased interrupting rating at high voltages without increasing the size of the circuit breaker while maintaining full compliance with standards.
[00055] For the simplicity of understanding of the subject matter, following reference numerals are used for associated/corresponding feature/elements of the proposed circuit breaker:

10. Circuit breaker
42 (42a, 42b, 42c) Breaking unit
43. Chassis
56a, 56b, 56c, 56d Hexagonal head bolts
57a, 57b, 57c, 57d Hexagonal nuts
81, 82. Cassettes
98a, 98b. Vent
85, 86. Fixed contacts
103a, 103b, 104 Adhesive components

[00056] FIG. 1 illustrates a molded case circuit breaker (MCCB), in accordance with an exemplary embodiment of the present disclosure. FIG. 2 illustrates a MCCB having an operating handle, in accordance with another exemplary embodiment of the present disclosure.
[00057] Referring to FIGs. 1 and 2, a Molded Case Circuit Breaker (MCCB) 10 with electronic tripping unit (ETU) 20 can be described in general. The circuit breaker assembly 10 can include Rear housing 41 which covers basic breaking unit 42 from outside for intended uniform look and feel to customer.
[00058] In an embodiment, the ETU 20 can include sensing devices and electronic card with micro-processor to sense, calculate, analyze and give trip command to Flux device 11 which intern actuate the trip bar of Mechanism unit 30.
[00059] In an embodiment, the basic breaking unit 42 can be mechanically coupled with mechanism unit 30, changes the status of arc quenching chamber 42a, 42b and 42c as per the actuation instruction given by mechanism unit 30. As it is a three pole system, three arc quenching chamber are depicted, while the same arc quenching chamber 42d will be used to form four pole systems.
[00060] As shown in FIG. 2, an operating handle 50 can be mechanically coupled with mechanism unit 30 to operate the MCCB 10 manually. The operating handle 50 can be further fitted with the IP cover 51 which provides ingress protection of 40 from front. The chassis 43 can be mechanically coupled with basic breaking unit 42, which accommodates internal accessories and respective actuators. Front cover 48 can be mechanically coupled with chassis 43. Breaker Skin 49 can be fitted on front cover 48. In an embodiment, the said screw for joining of Breaker front cover 48 are Hi-lo screw 47a, 47b, 47c and 47d gives high holding strength to Breaker front cover due to high overlap between self-tapping screw threads and accommodating thermoplastic
[00061] FIG. 3 illustrates a MCCB with a breaker skin coupled with front cover, in accordance with another exemplary embodiment of the present disclosure.
[00062] As shown in FIG. 3, breaker skin 49 can be coupled with front cover 48 by 8 click fit out of which 4 click fits 49a, 49b, 49c and 49d are clearly visible. Click-fit 49a, 49b, 49c and 49d and symmetrically other 4 click-fits prevents the breaker skin 49 from removal during short circuit due to pressurized gases at high voltages. The number of click fits increases the holding force for breaker skin 49 in case high voltage breaking capacity. The overlapping area between click fit 49a, 49b, 49c and 49d of breaker skin 49 and slots for click fit 48a, 48b, 48c and 48d of front cover 48 increases the strength of the assembly and avoids removal of skin during short circuit at high voltages. The enhanced click-fits 49a, 49b, 49c and 49d on said Breaker Skin 49 is fitted with Breaker front cover 48 prevents undesired opening or removal of Breaker skin during breaking capacity at high voltages.
[00063] FIG. 4 illustrates a MCCB with a front cover, in accordance with another exemplary embodiment of the present disclosure.
[00064] As shown in FIG. 4, front cover 48 can be mechanically coupled with chassis 43 by screws 47a, 47b, 47c and 47d. As shown in FIG. 4 and 5, screws 47a, 47b, 47c and 47d enter the aperture 46a, 46b, 46c and 46d to bond the front cover 48 and chassis 43. Screws 47a, 47b, 47c and 47d are Hi-lo screws, to provide more strength to the joint. Hi-lo screws have a major diameter of thread more than the normal self-tapping screw and also provide larger overlap with counter bore due to pan head construction. Major diameter of hi-lo screw is greater than any self-tapping screw, thus overlap and engagement between hi-lo screw 47a, 47b, 47c and 47d and chassis hole 46a, 46b, 46c and 46d is greater, which increase the strength of the coupling avoiding the removal of front cover 48 during short circuit at higher voltages. Very high pressure gases are exhausted during the short circuit at high voltage pressurizing the front cover 48 to break and expose live parts of MCCB 10 to customer which is avoided by high strength hi-lo screw 47a, 47b, 47c and 47d. Over and above this, Hi-Lo screws with property class 4.8 facilitate more no. of screw and un-screw operations to user.
[00065] FIG. 5 illustrates a MCCB with IP cover held by an operating handle, in accordance with another exemplary embodiment of the present disclosure.
[00066] As shown in FIG. 4 and 5, screws 47a, 47b, 47c and 47d enter the aperture 46a, 46b, 46c and 46d to bond the front cover 48 and chassis 43. Screws 47a, 47b, 47c and 47d are Hi-lo screws, to provide more strength to the joint. Hi-lo screws have a major diameter of thread more than the normal self-tapping screw and also provide larger overlap with counter bore due to pan head construction. Major diameter of hi-lo screw is greater than any self-tapping screw, thus overlap and engagement between hi-lo screw 47a, 47b, 47c and 47d and chassis hole 46a, 46b, 46c and 46d is greater, which increase the strength of the coupling avoiding the removal of front cover 48 during short circuit at higher voltages. Very high pressure gases are exhausted during the short circuit at high voltage pressurizing the front cover 48 to break and expose live parts of MCCB 10 to customer which is avoided by high strength hi-lo screw 47a, 47b, 47c and 47d. Over and above this, Hi-Lo screws with property class 4.8 facilitate more no. of screw and un-screw operations to user.
[00067] As shown in FIG. 5, IP cover 51 can be held by the operating handle 50. Removal of IP cover 51 is avoided by front cover 48. Operating handle 50 can be mechanically coupled to mechanism 30 by screw (screw is not visible in the figure) to hold the operating knob 50 tightly and avoid its removal. Operating handle 50 is additionally restricted by front cover 48. Operating knob 50, front cover 48 and breaker skin 49 experiences high pressure during short circuit at high voltages and hence are mechanically coupled by screws to avoid removal of components and facilitate further operations for rated service breaking capacity.
[00068] As shown in FIG. 5, chassis 43 can be mechanically coupled with basic breaking unit 42 with 2 high tensile screws with property class 4.8, 44a and 44b on top and 2 high tensile screw with property class 4.8, 45a and 45b at bottom. Screw 44a and 44b can be fastened at holes 52a and 52b in basic breaking unit 42, in which the hole of 42a and 42c is used for fastening chassis 43 by screws 44a and 44b. As shown in FIG. 2 and 5, screw 45a and 45b passing through mechanical spacer 53a and 53b are fastened with nuts provided in the slot 54a and 54b. Screws 45a and 45b sandwiches basic breaker unit 42 between chassis 43 and rear housing 41. This increases the overall holding force and avoids the dismantling of basic breaker unit 42 and housing 41 during high voltage breaking. The dual fitment of chassis 43 on the basic breaker unit 42 eliminates the removal and breakage during short circuit at high voltages. Also the overlap area of these joining screws has been increased with selection of pan head construction.
[00069] FIG. 6 illustrates a MCCB with Individual basic breaking units, in accordance with another exemplary embodiment of the present disclosure.
[00070] Before the chassis 43 can be coupled with basic breaking unit 42, individual basic breaking units 42a, 42b and 42c are stacked together to form basic breaking unit 42. Individual basic breaking units and term “poles” is used interchangeably. As shown in FIG. 6, poles 42a, 42b and 42c can be joined by 4 hexagonal head bolts 56a, 56b, 56c and 56d which are fastened with hexagonal nuts 57a, 57b, 57c and 57d. Hexagonal head bolts 56a, 56b, 56c and 56d used for stacking the poles 42a, 42b and 42c provide greater strength than that of normal strength screws as tensile strength for hexagonal head bolt is more. Hexagonal head bolts of class 12.9 are used which holds the poles 42a, 42b and 42c tightly and prevents opening of poles during short circuit at higher voltages. In an embodiment, Creepage between said common member Hexagonal head bolt 56a, 56b, 56c and 56d passing through all poles 42a, 42b and 42c and Fixed contact assembly 85 and 86 in particular poles, is enhanced with silicon rubber adhesive to prevent comparative tracking between them during short circuit at high voltages. Also the same application silicon adhesive prevents undesired opening of cassettes during high voltage rupturing due to high pressurized gases.
[00071] As shown in FIG. 2 and 5, basic breaking unit 42 with chassis 43 can be mechanically coupled with rear housing 41. Removal of rear housing is prevented by the screw 45a and 45b and nut arrangement from chassis 43 to rear housing 41. Rear housing 41
can be provided with 2 click fits, out of which one is clearly visible in FIG. 2 59a, other is symmetrically opposite to 59a. Clickfit 59a latches to the surface 60a as shown in FIG. 6 which is symmetrically opposite to the surface shown as 60b of the basic breaking unit 42c. Rear housing 41, basic breaking unit 42 and chassis 43 together forms breaking unit 40
[00072] During short circuit at high voltages like 800V and 1000V highly pressurized gases are formed inside the arc chamber containing highly ionized gases at very high temperature. These highly pressurized gases have tendency to escape through any free space available, in order to avoid the leakage of highly pressurized gases which leads to breakage and deformation of components, these highly pressurized gases are routed out through the vent. The venting allows the flow of highly pressurized gases out of the MCCB 10 will be discussed in detail.
[00073] FIG. 7 illustrates a MCCB with diametrically opposite side of rotating contact, in accordance with another exemplary embodiment of the present disclosure.
[00074] FIGs. 8-11 illustrate an exemplary working of proposed MCCB, in accordance with an exemplary embodiment of the present disclosure.
[00075] Highly pressurized ionized gases can be routed out of MCCB 10 from two sides through vents 98a and 98b with higher opening. As shown in FIG. 7, at the one side these highly pressurized gases are routed out through the opening 62a, 62b and 62c. This opening 62a, 62b and 62c directly route the highly pressurized gases out the MCCB 10, avoiding the leakage or spread of highly pressurized gases to any other part of MCCB 10. In an embodiment, the said opening of the vent 98a and 98b, provided in poles 42a, 42b and 42c is made up of flexible material with higher opening to prevent high pressure condition inside the arc chamber of poles and easy escape of ionized gasses from opening.
[00076] As shown in FIG.7 and 8, at diametrically opposite side of rotating contact which is the other side of MCCB 10, highly pressurized gases are formed in the chamber 93. These highly pressurized gases at other side are initially routed from 61a, 61b and 61c to the ETU 20 side opening 63a, 63b and 63c. From 63a, 63b and 63c the highly pressurized gases are routed out of MCCB 10 through 64a, 64b and 64c as shown in FIG.8. When the breaking unit 40 can be mechanically coupled with ETU 20, the opening 61a, 62b and 63c is flushed with the opening 63a, 63b and 63c resulting in the routing of highly pressurized gases out the MCCB 10. The flushing thus formed between 61a, 61b and 61c and 63a, 63b and 63c avoids the leakage of these highly pressurized gases. During short circuit at high voltages, these highly pressurized gases tend to escape through the rear housing 41 surface 65a, 65b and 65c.
[00077] The highly pressurized gases tend to move upward towards the pole stacking hexagonal head bolt and Electrical joint between contact system and ETU, 56d and make it live, resulting in the internal flash-over. These highly pressurized gases when move upwards enter into the open space available between chassis 43 and mechanism 30, which exert high pressure on front cover 48. Due to this pressure the front cover 48 can break and get removed thus exposing the mechanism 30 and preventing rated service breaking capacity test. To avoid the leakage of highly pressurized gases and ensure routing of gases directly out of MCCB 10, the area around opening 61a, 61b and 61c is sealed by silicon rubber adhesive. This adhesive is applied on the outer surface of opening 61a, 61b and 61c to ensure 100% flushing with the opening 63a, 63b and 63c respectively. The silicon rubber adhesive is semisolid and has high viscosity which prevents it from flowing and moving to undesired area. It occupies space and acts like sealant. The silicon rubber adhesive applied on the opening 61a, 61b and 61c ensure the sealing and prevent the gases from moving towards the rear housing 41, hexagonal head bolt 56d and chassis 43. The same restricts the removal of rear housing 41 and ETU 20 as adheres tightly to breaking unit 42. In an embodiment, the said venting channels 61a, 61b and 61c of basic breaker 40 are used to continue the flow of highly pressurized gasses through venting channels 63a, 63b and 63c of ETU 20 where the leakages of the said highly pressurized gasses are prevented through application of silicon rubber adhesive at surfaces around 61a, 61b and 61c. The silicon rubber adhesive has characteristics including a maximum service temperature at 90 degree Celsius, high strength during and after short circuit at high voltages, ability to bond different materials, sealing property.
[00078] As shown in FIG.7 and 8, these highly pressurized gases when moving upward towards the chassis 43 also enter the ETU 20 via wiring slot 28. As the highly pressurized gases enter the ETU 20 in the chamber containing the electronics card, pushes the ETU front cover 22 with high pressure, resulting in removal and breaking of ETU front cover 22. In order to avoid the removal and breakage of ETU front cover 22, it is mechanically coupled to ETU box 21 by hi-lo screws 23a and 23b which are fastened into holes 24a and 24b which avoids the removal ETU front cover 22. To further cover the ETU front cover 22, it is further covered by ETU flapper 25 by click fits 26a and 26b which latches to slot 27a and 27b. Thus the adhesive applied to seal the opening 61a, 61b and 61c prevents the removal of ETU front cover 22.
[00079] As shown in FIG. 9, 10 and 11, the highly pressurized gases formed inside the chamber 92 and 93, before routing out of the MCCB 10, exert very high pressure on the inner walls of cassette 81 and 82. Cassette 81 and 82 can be re-enforced with additives with percentage more than 45% to achieve desired Ultimate tensile strength. Same applies for pole 42b and 42c as 42a, 42b and 42c are identical. Due to these highly pressurized gases the cassettes 81 and 82 tend to open which is undesirable. Cassettes 81 and 82 can be coupled by two rivets 83a and 83b which hold the cassettes 81 and 82 tightly at the end 84a and 84b. While closing the cassettes 81 and 82, surface 99a, 99b, 99c and 99d of cassette 81 flushes with surface 100a, 100b, 100c and 100d of cassette 82 with large overlap area. This overlap area acts as dielectric medium and prevents the movement of highly pressurized gases out of the pole 42a and creating electrical tracking between Hexagonal head bolt 56a, 56b, 56c and 56d and live fixed contacts 85 and 86. But at high voltages applications, these dielectric mediums 99a, 99b, 99c and 99d tends to fail and create phase cross over between Hexagonal head bolt 56a, 56b, 56c and 56d and live fixed contacts 85 and 86. In order to avoid this internal flash over silicon rubber adhesive is applied on surface 103a, 103b and 104. Adhesive on these surfaces seals the surface completely and prevents the leakage of highly pressurized gases and maintain the dielectric strength of the system at high voltage rapturing too. Silicon rubber adhesive seals the path of escape of highly pressurized gases and holds the cassettes 81 and 82 together preventing the pole 42a from opening during short circuit at high voltages. In an embodiment, the said poles 42a, 42b and 42c consist of two cassette constructions 81 and 82, are moulded with reinforced compression grade thermoset sheet moulding material. The percentage of reinforced additive is more than 45% to increase ultimate tensile strength at breaking capacities at high voltages.
[00080] 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.
[00081] 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 refer 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.
[00082] 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.
[00083] 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.
[00084] 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.

[00085] 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.
[00086] 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.
[00087] 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
[00088] The present disclosure provides a moulded case circuit breaker (MCCB) or any breaker with foot-print and overall size or volume same and improved for high voltages breaking capacities.
[00089] The present disclosure provides an arrangement or mechanism for improved breaking capacities at high voltages.
[00090] The present disclosure provides provide an improved module or mechanism to increase or to achieve breaking capacities at high voltages (more than 690V) without increasing the physical dimensions or weight of an existing design of relatively low voltage circuit breaker.
[00091] The present disclosure provides a circuit breaker having an increased interrupting rating at high voltages without increasing the size of the circuit breaker while maintaining full compliance with standards.
[00092] The present disclosure provides a circuit breaker with no load-line biased such that high voltage supply can be provided at/from both side.