Claims:
1. A molded case circuit breaker (MCCB) for protecting electrical systems against fault current conditions, the circuit breaker comprising:
an operating mechanism that comprises of a resetting pin wherein said resetting pin is riveted to a fork;
an accessory unit integrated with said operating mechanism by means of an accessory actuator; and
a chassis/housing to house the accessory unit and facilitate integration between the accessory unit and the operating mechanism.
2. The circuit breaker of claim 1, wherein the accessory actuator is made up of plastic material.
3. The circuit breaker of claim 1, wherein said accessory unit comprises of an under voltage release/shunt release device.
4. The circuit breaker of claim 1, wherein the accessory actuator comprises of a tripping slope, a slot, a tripping profile and a resetting profile.
5. The circuit breaker of claim 4, wherein said tripping profile of the accessory actuator actuates a trip plate of said operating mechanism while tripping and resetting profile of the accessory actuator resets both operating mechanism and internal accessory simultaneously.
6. The circuit breaker of claim 1, wherein said accessory unit comprises of a locating profile, a guiding edge, a tripping pin.
7. The circuit breaker of claim 1, wherein said accessory unit is coupled to a fitting/tightening hardware.
8. The circuit breaker of claim 1, wherein said chassis comprises of a locking profile, a guiding cam profile wherein the guiding cam profile of the chassis facilitates complete guidance of guiding edge of the accessory unit so that intended location of the accessory unit is achieved prior to finalizing fitment of the accessory unit by means of the fitting hardware.
9. The circuit breaker of claim 1, wherein rotation of the resetting pin with the fork is converted into a linear motion of the accessory actuator through the interaction of resetting pin and resetting profile of the accessory actuator.
10. The circuit breaker of claim 1, wherein movement of accessory actuator is in opposite direction of trip such that during tripping conditions, the accessory unit gets reset and the operating mechanism gets locked with the tripping pin.

, Description:TECHNICAL FIELD
[0001] The present disclosure relates generally to protection devices for protecting electrical circuits against fault current conditions. In particular, the present invention discloses a fitting for guiding and/or integrating internal accessories of the protection device.

BACKGROUND
[0002] Now-a-days, molded case circuit breakers (MCCBs) are widely used power protection devices in industrial as well as domestic sectors. The major advantage of MCCBs over combination of switch disconnectors and fuses is that it provides trip as one of the state to the customer along with ON & OFF status. Further, inbuilt thermal-magnetic release or microprocessor based release facilitate fast sensing of faults and tripping of MCCB. Thus, MCCB gives all the benefits of switch disconnectors and fuses in one consolidated product and results in less space or volume consumption at user end.
[0003] An under voltage release device provides trip command to the MCCB in case voltage dips further to specified values of voltage. Further, a shunt release device provides trip command to the MCCB when power supply is applied to shunt trip terminals, and hence facilitates remote tripping feature.
[0004] Thus there is a need for a device that can provide under voltage release and shunt release tripping mechanisms to an MCCB such that the MCCB effectively trips an electrical system using such under voltage release/shunt release tripping mechanisms.

OBJECTS OF THE INVENTION
[0005] A general object of the present disclosure is to provide a protection device that trips an electrical system in case of a fault current condition.
[0006] Another object of the present disclosure is to provide a protection device with an actuator that integrates various internal accessories and mechanisms.
[0007] Another object of the present disclosure is to provide an improved under voltage release/shunt release device for utilization as an accessory for electric circuit breakers.
[0008] Another object of the present disclosure is to provide an under voltage release/shunt release device that automatically resets in an efficient and reliable manner.
[0009] Another object of the present disclosure is to provide a protection device that incorporates a housing/chassis that houses all the internal accessories and mechanisms.

SUMMARY
[0010] The present disclosure relates generally to protection devices for protecting electrical circuits against fault current conditions. In particular, the present invention discloses a fitting for guiding and/or integrating internal accessories of the protection device.
[0011] In an aspect, the present invention discloses a molded case circuit breaker (MCCB) for protecting electrical system against fault current conditions wherein the circuit breaker consists of an operating mechanism that comprises of a resetting pin wherein said resetting pin is riveted to a fork, an accessory unit integrated with said operating mechanism by means of an accessory actuator, and a chassis/housing to house the accessory unit and facilitate integration between the accessory unit and the operating mechanism.
[0012] In an aspect, the accessory actuator is made up of plastic material.
[0013] In an embodiment, the accessory unit comprises of an under voltage release/shunt release device.
[0014] In an embodiment, the accessory actuator comprises of a tripping slope, a slot, a tripping profile and a resetting profile wherein said tripping profile of the accessory actuator actuates a trip plate of said operating mechanism while tripping and resetting profile of the accessory actuator resets both operating mechanism and internal accessory simultaneously.
[0015] In an embodiment, the accessory unit comprises of a locating profile, a guiding edge, a tripping pin and said accessory unit is coupled to a fitting/tightening hardware.
[0016] In an embodiment, chassis comprises of a locking profile, a guiding cam profile wherein the guiding cam profile of the chassis facilitates complete guidance of guiding edge of the accessory unit so that intended location of the accessory unit is achieved prior to finalizing fitment of the accessory unit by means of the fitting hardware wherein rotation of the resetting pin with the fork is converted into a linear motion of the accessory actuator through the interaction of resetting pin and resetting profile of the accessory actuator.
[0017] In an aspect, movement of the accessory actuator is in opposite direction of trip such that during tripping conditions, the accessory unit gets reset and the operating mechanism gets locked with the tripping pin.

BRIEF DESCRIPTION OF THE DRAWINGS
[0018] 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.
[0019] Fig. 1 illustrates an exemplary representation of a circuit breaker along with various components in accordance with embodiments of the present disclosure.
[0020] Fig. 2 illustrates an exemplary front view of the circuit breaker with an accessory unit inserted into an accessory recess in accordance with embodiments of the present disclosure.
[0021] Fig. 3 illustrates an exemplary cross-sectional view of the circuit breaker along A-A section prior to insertion of accessory unit within the accessory recess in accordance with embodiments of the present disclosure.
[0022] Fig. 4 illustrates an exemplary cross-sectional view of the circuit breaker along A-A section during insertion of the accessory unit within the accessory recess in accordance with embodiments of the present disclosure.
[0023] Fig. 5 illustrates an exemplary cross-sectional view of the circuit breaker along A-A section at final intended position in accordance with embodiments of the present disclosure.
[0024] Fig. 6A and Fig. 6B illustrate exemplary representations of an accessory unit in accordance with embodiments of the present disclosure.
[0025] Fig. 7A and Fig. 7B illustrate exemplary representations of an accessory module in accordance with embodiments of the present disclosure.
[0026] Fig. 8 illustrates an exemplary representation of the circuit breaker prior to insertion of the accessory unit within the accessory recess in accordance with embodiments of the present disclosure.

DETAILED DESCRIPTION
[0027] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such details 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 spirit and scope of the present disclosure as defined by the appended claims.
[0028] Embodiments explained herein relate generally to protection devices for protecting electrical circuits against fault current conditions. In particular, the present invention discloses a fitting for guiding and/or integrating internal accessories of the protection device.
[0029] In an aspect, the present invention discloses a molded case circuit breaker (MCCB) for protecting electrical system against fault current conditions wherein the circuit breaker consists of an operating mechanism that comprises of a resetting pin wherein said resetting pin is riveted to a fork, an accessory unit integrated with said operating mechanism by means of an accessory actuator, and a chassis/housing to house the accessory unit and facilitate integration between the accessory unit and the operating mechanism.
[0030] In an aspect, the accessory actuator is made up of plastic material.
[0031] In an embodiment, the accessory unit comprises of an under voltage release/shunt release device.
[0032] In an embodiment, the accessory actuator comprises of a tripping slope, a slot, a tripping profile and a resetting profile wherein said tripping profile of the accessory actuator actuates a trip plate of said operating mechanism while tripping and resetting profile of the accessory actuator resets both operating mechanism and internal accessory simultaneously.
[0033] In an embodiment, the accessory unit comprises of a locating profile, a guiding edge, a tripping pin and said accessory unit is coupled to a fitting/tightening hardware.
[0034] In an embodiment, chassis comprises of a locking profile, a guiding cam profile wherein the guiding cam profile of the chassis facilitates complete guidance of guiding edge of the accessory unit so that intended location of the accessory unit is achieved prior to finalizing fitment of the accessory unit by means of the fitting hardware wherein rotation of the resetting pin with the fork is converted into a linear motion of the accessory actuator through the interaction of resetting pin and resetting profile of the accessory actuator.
[0035] In an aspect, movement of the accessory actuator is in opposite direction of trip such that during tripping conditions, the accessory unit gets reset and the operating mechanism gets locked with the tripping pin.
[0036] Fig. 1 illustrates an exemplary representation of a circuit breaker 100 along with various components wherein a plastic cover 102 is depicted open and an accessory unit 104 is properly housed into an accessory recess/cavity 106 of chassis/housing 108.
[0037] In an aspect, the accessory unit 104 is integrated with an operating mechanism 110 by means of a plastic accessory actuator 112.
[0038] Fig. 2 illustrates an exemplary front view of the circuit breaker 100 with an accessory unit 104 inserted into the accessory recess 106 wherein the circuit breaker 100 trips the accessory unit 104 that is housed within the accessory recess 106 of the chassis 108. Further, the parting line (section A-A) of cross-section of the circuit breaker 100is also depicted for reference of figures ahead.
[0039] Fig. 3 illustrates an exemplary cross-sectional view of the circuit breaker 100 along the parting line (section A-A) prior to insertion of the accessory unit wherein within the accessory recess 106 of chassis 108.
[0040] In an aspect, locating profile 302 of accessory unit 104 first interacts with a locking profile 304 of chassis 108. The interaction of two profiles acts as a hinge point for assembly and locates the accessory unit 104. The same interaction further acts as a locator or stopper for the accessory unit 104 after the completion of fitment.
[0041] In an aspect, guiding cam profile 306 (as clearly shown in FIG. 6A) of chassis 108 facilitates complete guidance of guiding edge 308 (as clearly shown in FIG. 6B) of the accessory unit 104 until complete insertion of the accessory unit 104 into the accessory recess 106 such that intended location of the accessory unit 104 is achieved prior to finalizing the fitment of the accessory unit 104 by means of a fitment/tightening hardware 310 (as clearly shown in FIG. 6B).
[0042] Fig. 4 illustrates an exemplary cross-sectional view of the circuit breaker 100 along A-A section during insertion of the accessory unit a tripping slope 402 of the plastic accessory actuator 112 receives a tripping pin 404 of the accessory unit 104. The tripping pin 404 of the accessory unit 104 interacts with the tripping slope 402 of the plastic accessory actuator 112.
[0043] In an aspect, insertion force on accessory unit 104 and tripping force of tripping pin 404 facilitates a driving force to the tripping slope 402 of the plastic accessory actuator 112 causing movement of the accessory actuator 112.
[0044] In an aspect, the peculiarity of invention is providing safety to end customer from hazardous event of shock. Accordingly, if circuit breaker 100 is switched ON and the internal accessory 104 is energized through control circuit instead of main circuit, then there is a high chance to get shock or electrocuted if customer tends to insert the accessory unit 104 when main circuit is energized. The invention provides sufficient safety to customer as it trips the MCCB and inturn trips the main circuit, thus, preventing a hazardous event.
[0045] Fig. 5 illustrates an exemplary cross-sectional view of the circuit breaker 100 along A-A section at final intended position wherein the accessory unit 104 is located at final intended position with the plastic accessory actuator 112 moved completely to actuate the trip plate of the operating mechanism 110.
[0046] In an aspect, tripping pin 502 of accessory unit 104 is completely received by slot 504 of the plastic accessory actuator 112. Further, an accessory resetting pin 504 of the operating mechanism 110 facilitates resetting of the accessory unit 104 while resetting the operating mechanism 110.
[0047] In an embodiment, the resetting pin 504 is riveted with a fork 506 (as clearly shown in FIG. 8) of the operating mechanism 110.
[0048] Fig. 6A and Fig. 6B illustrate exemplary representations of an accessory unit wherein tripping pin 404, guiding edge 602, locating profile 302 and tightening hardware 310 of the accessory unit 104 are shown.
[0049] Fig. 7A and Fig. 7B illustrate exemplary representations of an accessory module wherein tripping slope 402, slot 504, tripping profile 406 and resetting profile 508 of the plastic accessory actuator 112 are shown.
[0050] In an aspect, a tripping profile 406 of the plastic accessory actuator 112 utilizes the movement caused by insertion force and tripping force of tripping pin 404 and trips the MCCB mechanism 110, if the MCCB is switched ON.
[0051] Fig. 8 illustrates an exemplary representation of the circuit breaker 100 prior to insertion of the accessory unit 104 within the accessory recess 106 of chassis 108 wherein guiding cam profile 306 of the chassis 106 is shown along with the resetting pin 504 and fork 506 of the operating mechanism 110.
[0052] In an aspect, guiding cam profile 306 of chassis 108 facilitates complete guidance of guiding edge 308 of the accessory unit 104 until complete insertion of the accessory unit 104 into the accessory recess 106 such that intended location of the accessory unit 104 is achieved prior to finalizing the fitment of the accessory unit 104 by means of a fitment/tightening hardware 310.
[0053] In an aspect, trip status in MCCBs facilitates the user to use various accessories through control circuits such that main circuit can be isolated from downstream appliances in case of emergencies or faults. To normalize the system, resetting operation of the operating mechanism 110 of circuit breaker 100 is to be done. The operation of resetting the operating mechanism 110 causes rotary motion of fork 506 and resetting pin 504. This rotation of resetting pin 504 with fork 506 in converted into a linear motion of the plastic accessory actuator 112 through the interaction of resetting pin 504 and resetting profile 508. This movement of plastic accessory actuator 112 is in opposite direction of trip so that the accessory unit 104 gets reset and trip latch of the operating mechanism 110 get locked with tripping pin 404.
[0054] 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
[0055] The present disclosure provides a protection device that trips an electrical system in case of a fault current condition.
[0056] The present disclosure provides a protection device with an actuator that integrates various internal accessories and mechanisms.
[0057] The present disclosure provides an improved under voltage release/shunt release device for utilization as an accessory for electric circuit breakers.
[0058] The present disclosure provides an under voltage release/shunt release device that automatically resets in an efficient and reliable manner.
[0059] The present disclosure provides a protection device that incorporates a housing/chassis that houses all the internal accessories and mechanisms.