Claims:
1. A form spring (102) for an electrical device having at least an electrical contact system (218) adapted to be opened and closed and a flux shift device (FSD) (212) operable to issue a trip command to the electrical device, wherein:
the form spring (102) is coupled with an operating lever fork (206) of an operating assembly (202) of the electrical device operable between ON and OFF condition of the electrical device, and
the form spring (102) is adapted to move along with the operating lever fork (206) while operating between ON and OFF condition to automatically reset the FSD while resetting of the operating lever fork (206) during reset of the electrical device.

2. The form spring (1) as claimed in claim 1, wherein the form spring (102) comprises at least two ends, at least a first end (102-1) from the at least two ends is movable and at least a second end (102-2) from the at least two ends is fixed, and wherein the second end (102-2) of spring is inserted and fixed into the operating lever fork (206) of the operating assembly (202).

3. The electrical device as claimed in claim 1, wherein the electrical device is a circuit breaker.

4. The electrical device as claimed in claim 1, wherein the electrical device is a switching device.

5. The electrical device as claimed in claim 1, wherein during ON to OFF operation of the operating lever fork (206), the operating lever fork (206) moves in a first direction and the form spring (102) pushes a reseter (214) of the FSD (212) for resetting the FSD.

6. The electrical device as claimed in claim 5, wherein when the form spring (1) pushes the reseter (214) of the FSD (212) for resetting the FSD, the electrical device is in OPEN condition.

7. The electrical device as claimed in claim 1, wherein during OFF to ON operation of the operating lever fork (206), the operating lever fork (206) moves in a first direction and the form spring (102) releases a reseter (214) of the FSD (212).

8. The electrical device as claimed in claim 7, wherein when form spring (102) releases the reseter (214) of the FSD (212), the electrical device is in CLOSED condition.

9. The electrical device as claimed in claim 1, wherein the form spring (102) is pivoted on the fork pivot pin (204) of the operating assembly (202).

10. The electrical device as claimed in claim 1, wherein the form spring (102) comprises a spring loaded plunger.

11. An electrical device having at least an electrical contact system (218) adapted to be opened and closed and a flux shift device (FSD) (212) operable to issue a trip command to the electrical device, the electrical device comprising:
a molded chassis (222) having the FSD (212) mounted thereon using one or more screws (216); and
a form spring (102) as claimed in claim 1.
, Description:
TECHNICAL FIELD
[0001] The present disclosure relates to a field of protection devices, and more specifically relates to, a molded case circuit breakers (MCCB) for resetting a Flux shift device (FSD) using form spring a part of mechanism.

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] A circuit breaker is employed for current interruption. More particularly MCCBs are utilized to protect instruments from damage during adverse conditions prevailing during the operation of the circuit in which molded case circuit breaker is employed. During adverse conditions like short circuit, the current rises to an alarmingly high level. The high current may cause damage to the parts in the electrical system. Hence during these conditions, the circuit has to be opened to protect the parts after the breaker.
[0004] A circuit breaker can be manually opened and closed, as well as automatically opened to protect conductors or equipment’s from damage caused by excessive heating due to over current in abnormal conditions such as overload or short-circuit. FSD is a one of the accessories which helps in issuing TRIP command to the circuit breaker. So after every TRIP command it needs to be rested. There are different methods by which you can reset the FSD so that it can again be used to issue TRIP command under circumstances like short circuit, overload etc.
[0005] However, conventionally, the pin or a metal protrusion from the sheet metal parts is used for resetting of FSD. Further, the prior-art requires complex and more components for resetting of FSD. Furthermore, resetting of FSD by using conventional techniques is cumbersome, inefficient and difficult.
[0006] Whereas there is certainly nothing wrong with existing techniques or system, nonetheless, there still exists a need to provide an efficient, effective, reliable and improved molded case circuit breakers (MCCB) for resetting a Flux shift device (FSD) using form spring a part of mechanism. Further, there exists need of a method for resetting a Flux shift device (FSD) by using form spring. Furthermore, there exists need of a form spring based FSD resetting mechanism to make the resetting process smooth as well as robust.
[0007] 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.
[0008] 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.
[0009] 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.
[00010] 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.
[00011] 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.

SUMMARY
[00012] The present disclosure relates to a field of protection devices, and more specifically relates to, a molded case circuit breakers (MCCB) for resetting a Flux shift device (FSD) using form spring a part of mechanism.
[00013] Accordingly, an aspect of the present disclosure relates to a form spring for an electrical device having at least an electrical contact system adapted to be opened and closed and a flux shift device (FSD) operable to issue a trip command to the electrical device. The form spring is coupled with an operating lever fork of an operating assembly of the electrical device operable between ON and OFF condition of the electrical device. The form spring is adapted to move along with the operating lever fork while operating between ON and OFF condition to automatically reset the FSD while resetting of the operating lever fork during reset of the electrical device.
[00014] In an aspect, the form spring includes at least two ends, at least a first end from the at least two ends is movable and at least a second end from the at least two ends is fixed. The second end of spring is inserted and fixed into the operating lever fork of the operating assembly.
[00015] In an aspect, the electrical device is a circuit breaker.
[00016] In an aspect, the electrical device is a switching device.
[00017] In an aspect, during ON to OFF operation of the operating lever fork, the operating lever fork moves in a first direction and the form spring pushes a reseter of the FSD for resetting the FSD.
[00018] In an aspect, when the form spring pushes the reseter of the FSD for resetting the FSD, the electrical device is in OPEN condition.
[00019] In an aspect, during OFF to ON operation of the operating lever fork the operating lever fork moves in a first direction and the form spring (102) releases a reseter of the FSD.
[00020] In an aspect, when form spring releases the reseter of the FSD, the electrical device is in CLOSED condition.
[00021] In an aspect, the form spring is pivoted on the fork pivot pin of the operating assembly.
[00022] In an aspect, the form spring includes a spring loaded plunger.
[00023] An aspect of the present disclosure relates to an electrical device having at least an electrical contact system adapted to be opened and closed and a flux shift device (FSD) operable to issue a trip command to the electrical device. The electrical device includes a molded chassis having the FSD mounted thereon using one or more screws and a form spring.
[00024] 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
[00025] 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:
[00026] FIG. 1 illustrates an isometric view of a form spring, in accordance with an exemplary embodiment of the present disclosure.
[00027] FIG. 2 illustrates a side view of an operating mechanism and contact system in ON Position, in accordance with an exemplary embodiment of the present disclosure.
[00028] FIG. 3 illustrates a side view of an operating mechanism and contact system in OFF Position, in accordance with an exemplary embodiment of the present disclosure.
[00029] FIG. 4 illustrates an operating mechanism and contact system in RESET Position, in accordance with an exemplary embodiment of the present disclosure.
[00030] FIG. 5 illustrates an operating mechanism and contact system in TRIP Position, in accordance with an exemplary embodiment of the present disclosure.
[00031] FIG. 6 illustrates an isometric view of mechanism with Form Spring, in accordance with an exemplary embodiment of the present disclosure.
[00032] FIG. 7 illustrates an isometric view of a FSD, in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[00033] 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.
[00034] 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.
[00035] 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.
[00036] 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.
[00037] 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.
[00038] 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.
[00039] 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.
[00040] The present disclosure relates to a field of protection devices, and more specifically relates to, a molded case circuit breakers (MCCB) for resetting a Flux shift device (FSD) using form spring a part of mechanism.
[00041] However, conventionally, the pin or a metal protrusion from the sheet metal parts is used for resetting of FSD. Further, the prior-art requires complex and more components for resetting of FSD. Furthermore, resetting of FSD by using conventional techniques is cumbersome, inefficient and difficult.
[00042] The present invention provides molded case circuit breakers (MCCB) for resetting a Flux shift device (FSD) using form spring a part of mechanism. The proposed invention provides a method for resetting a Flux shift device (FSD) by using form spring. The proposed invention provides a form spring based FSD resetting mechanism to make the resetting process smooth as well as robust.
[00043] Earlier the resetting of FSD is achieved by means of circular pin instead of Form spring. Even competitors are also using the same pin or a metal protrusion from the sheet metal parts itself. The purpose of the proposed invention is to make the resetting process smooth as well as robust. By using the spring, the assembly problem is also getting resolved by means of removal of riveting process.
[00044] The proposed invention describes about a new component in mechanism that helps in achieving resetting of FSD (flux shift device) one of the accessories i.e. when breaker contacts were open this component (form spring) can reset the FSD while resetting the mechanism with breaker operating handle to the RESET position. Simple and fewer components ensure robust and reliable way of achieving the requisite functions.
[00045] An aspect of the present disclosure relates to a circuit breaker. The circuit breaker can include a molded chassis having a FSD (flux shift device) mounted on chassis with the help of screw can be rested by means of a form spring.
[00046] In an aspect, the form spring can have direct interaction with a fork lever without any intermediate links.
[00047] In an aspect, the form spring can have an easy and fast assembly on account of no extra component used.
[00048] In an aspect, the form spring can have easy replace ability.
[00049] In an aspect, the form spring can have unique construction with two legs. One leg is fixed and other is free or load leg.
[00050] For the simplicity of understanding of the subject matter, following reference numerals are used for associated/corresponding feature/elements of the proposed mechanism:
102- Form spring
102-1- Fixed leg
102-2- Free leg
202- Mechanism assembly
204- Fork pivot pin
206- Fork
208- TAC actuator
210- Lower link
212- FSD (Flux Shift Device)
214- Resetter link
216- FSD screw
218- Contact system assembly
220- Shaft
222- Chassis assembly
224- Plunger link
[00051] FIG. 1 illustrates an isometric view of a form spring, in accordance with an exemplary embodiment of the present disclosure.
[00052] In an embodiment, the proposed invention addressed to a circuit breaker for rapidly cooling and extinguishing an arc. The proposed invention describes a method by which if the breaker electrical conductors under some circumstance got welded and the weld remains unbroken, then the operating lever fork cannot be taken to “OFF” position. A lever fork can interfere with driveshaft which cannot let the lever fork move further even with the application of three times the normal force required to switch off the MCCB. And on removal of this force the lever can return to the “ON” position thereby depicting the true condition of the contacts and the circuit.
[00053] The embodiments are described with reference to a circuit breaker, but the present invention may be implemented on any electrical device that has electrical contact system that can be opened and closed and which is able to use FSD as a tripping device or accessory.
[00054] As shown in FIG. 1, the form spring can have unique construction with two legs. One leg is fixed and other is free or load leg. For example, 102-1 is fixed leg and 102-2 is free leg.
[00055] FIG. 2 illustrates a side view of an operating mechanism and contact system in ON Position, in accordance with an exemplary embodiment of the present disclosure.
[00056] As shown in FIG. 2, the form spring 102 can be pivoted at the fork pivot pin 204. The fork pivot pin 204 can be a part of a mechanism assembly. The standalone FSD assembly can be mounted on a chassis 222 with the help of mounting screw 216. FIG. 2 shows that the contact system is in ON condition as the lower link 210 has pushed the shaft 220 in downward direction. As shown in FIG. 2, the fork 206 is in on condition so the form spring 102 is in Free State as no load on the spring. The FSD assembly is also in resettled position.
[00057] FIG. 3 illustrates a side view of an operating mechanism and contact system in OFF Position, in accordance with an exemplary embodiment of the present disclosure.
[00058] As shown in FIG. 3, the form spring 102 can be pivoted at the fork pivot pin 204. The fork pivot pin 204 can be a part of a mechanism assembly. The standalone FSD assembly can be mounted on a chassis 222 with the help of a mounting screw 222. FIG. 3 also shows that the contact system is in OFF condition as the lower link 210 has pulled the shaft 220 in upward direction. As shown in FIG. 3, the fork 206 is in OFF condition so the Form spring 102 is in loaded state as it has to put load on the FSD rosette 216.
[00059] FIG. 4 illustrates an operating mechanism and contact system in RESET Position, in accordance with an exemplary embodiment of the present disclosure.
[00060] FIG. 5 illustrates an operating mechanism and contact system in TRIP Position, in accordance with an exemplary embodiment of the present disclosure.
[00061] As shown in FIG. 5, side view of a circuit breaker assembly in TRIP condition. FIG. 5 also shows that the contact system is in TRIP condition as the lower link 210 has pulled the shaft 220 in upward direction. As shown in FIG. 5, the fork 206 is in TRIP condition so the form spring 102 is in unloaded state as it has to put no load on the FSD screw 216.
[00062] In another embodiment, during normal operating conditions, when the fork is rotated from On to OFF, the fork can move the drive shaft 220 in clockwise direction making the breaker in OPEN condition. When the fork 206 rotates it also carries the form spring 102 along with it as the form spring 102 is mounted on pivot pin 204 and its one end 102-2 can be inserted into the slot made on fork 206. During ON to OFF the form spring 102 pushes the FSD screw 214 in backward direction so that it can get reseted. During OFF to ON operation the fork 206 can be rotated in anticlockwise direction making the shaft rotated in anticlockwise direction so that the breaker gets in CLOSED condition. When the fork rotated it also carries the form spring 102 with it so that the form spring releases the load on the FSD reseter 206.
[00063] FIG. 6 illustrates an isometric view of mechanism with Form Spring, in accordance with an exemplary embodiment of the present disclosure.
[00064] FIG. 6 shows the assembly of Form spring 102 with mechanism assembly 202. The form spring 102 can be first mounted on the fork pivot pin 204 then with the help of a sharp tool the fixed leg 102-2 of spring is inserted into the fork 206. The free leg 102-1 remains in free condition
[00065] FIG. 7 illustrates an isometric view of a FSD, in accordance with an exemplary embodiment of the present disclosure.
[00066] As shown in FIG. 7, the FSD includes a plunger link 224, a resseter link 214 and FSD screw 216.
[00067] In another embodiment, the proposed invention does not require additional components to achieve resetting of the FSD. The proposed invention provides direct interaction of fork lever and FSD reseter without any intermediate links. The proposed invention provides easy and fast assembly on account of no extra components. The proposed invention provides robust and reliable operations. In proposed invention there is no interlocking or interference of parts. The proposed invention provides overtravel on FSD reseter to ensure contact pressure
[00068] 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.
[00069] 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.
[00070] 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.
[00071] 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.
[00072] 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.
[00073] 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.
[00074] 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.