DESC:TECHNIAL FIELD

[001] The present subject matter described herein, in general, relates to electrical switching devices, specifically to circuit breakers, and more particularly, to a stored energy operating mechanism of a circuit breaker which enables the circuit breaker to make, carry and break current under normal circuit condition and under abnormal circuit condition respectively.

BACKGROUND

[002] An electrical switching device may be defined as a unit designed to connect, carry and disconnect electrical supply so as to protect the equipments connected in the electrical circuit from damage caused by overload, under-voltage or short circuit etc. Circuit breakers, molded case circuit breaker (MCCB), are well-known electrical switching devices uses an operating mechanism, to provide automatic circuit interruption, when circuit fault conditions occur. In an event of fault, a pair of separable contacts in a contact assembly is actuated to repel and separate from their original closed position.

[003] The operating mechanism includes an operating spring and a linkage arrangement to control the opening and closing of the pair of contacts. The operating mechanism permits the circuit breaker to store energy by compressing springs that are linked to the contact assembly of breaker by latching different links. Stored energy of springs and latching between the linkages allows breaker to make the contacts in case of a normal circuit condition, hence completing the electrical circuit (closing of breaker) and break the contacts, hence interrupting the electrical circuit (tripping of breaker).

[004] The closing and tripping time of the circuit breaker is very crucial in switchgear application as both closing and tripping are done in a very short span of time. Achieving such fast operation mainly depends on the way of distribution of forces in an operating mechanism of circuit breaker. Force distribution depends on released energies of various springs used in mechanism along with the way how latching and de-latching is done.

[005] The three operations that are to be performed by the stored energy (of operating mechanism)in molded case circuit breaker (MCCB) are:
1. Charging
2. On
3. Off/trip
These three operations of MCCB may be performed manually as well as electrically. The trip signal is given to the circuit breaker in an event of a fault by the release a protection relay that may include but not limited to a triple modular redundant(TMR), a under voltage protection relay (UV), a SHUNT protection relay module, which senses the abnormal conditions and gives TRIP command to the operation mechanism, which thereby opens the circuit.

[006] A user (operator personnel) may have access to the operating mechanism through the handle which may be provided in line with the housing of the breaker. The handle is placed over the side plate of the operating mechanism. The TRIP command is given automatically to the contacts by the release if it senses an abnormal condition like overload and short circuit. If the trip signal is given, the breaker opens the circuit and the knob goes to the trip position to show the operator personnel that a fault has occurred in the system. If the operator wants to switch ON the breaker after the breaker is tripped, he/she cannot do it until the circuit breaker is fully charged. This is to make sure that the operator shouldn't switch ON the breaker before clearing the fault. Charging of the breaker is done by pulling/pushing the handle (Driver link) towards the downward position from mounting position. This movement loads the mechanism spring and now it is possible for the operator to ON the breaker.

[007] Thus, in view the hitherto existing operating mechanism in circuit breaker, there exist a dire need to provide an improved energy storing operating mechanism for circuit breaker that enables the circuit breaker to achieve higher breaking capacity, reducing force required to charge main spring, better performs and involves less components.

SUMMARY OF THE INVENTION

[008] The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.

[009] Anobject of the present invention is to provide an improved operating mechanism that enables a circuit breaker to achieve higher breaking capacity.

[0010] Another object of the present invention is to provide an improved operating mechanism that reduces handle force required to charge the high force main spring.

[0011] Another object of the present invention is to provide an improved operating mechanism with less number of components and lesser dimensions as compared to the existing operating mechanism, so as to reduce the entire space of the breaker.

[0012] Yet another object of the present invention is to provide improved operating mechanism that produces higher withstand capacity during abnormal conditions like short circuit, overload etc.

[0013] Still another object of the present invention is to provide a high mechanical life of circuit breaker.

[0014] Accordingly, in one implementation, the present invention provides a stored energy mechanism module to regulate at least one ON or OFF operation of at least one molded case circuit breaker (MCCB) under normal and abnormal circuit condition, said stored energy mechanism module comprising:
at least two side-plate assembly comprises of at least one operating handle to drive the said stored energy mechanism module;
at least one cam assembly operable coupled with said side-plate assembly, comprises of at least one cam means, wherein said cam means rotated by means of one or more force received by said operating handle;
at least one coupler system mounted on said side-plate assembly, comprises of at least two charging links to guide at least one spring assembly;
said spring assembly comprises of at least one main spring means to store energy/force due to rotation of said cam means, and thereby transfer said energy/force to at least one latch system for regulating said ON or OFF operation of said MCCB;
said latch system comprises of at least two latch link means, at least two upper link means, and at least two lower link means, wherein said lower link means adapted to receive said energy stored in said main spring means to actuate at least one drive shaft means and subsequently enable latching or de-latching of at least one latch bracket by rotating at least one trip bar during said ON or OFF operation of said MCCB.

[0015] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

[0016] Figure 1 illustrates an isometric view of the four pole circuit breaker cassette with breaker, in accordance with an embodiment of the present subject matter.

[0017] Figure 2 illustrates an isometric view of the four pole Circuit Breaker cassette with stored energy mechanism in ready to assemble position, in accordance with an embodiment of the present subject matter.

[0018] Figure 3 illustrates an isometric view of current stored energy mechanism, in accordance with an embodiment of the present subject matter.

[0019] Figure 4 illustrates an exploded view of the mechanism, in accordance with an embodiment of the present subject matter.

[0020] Figure 5 illustrates an isometric view of left-hand side plate, in accordance with an embodiment of the present subject matter.

[0021] Figure 6 illustrates the exploded view of left-hand side plate, in accordance with an embodiment of the present subject matter.

[0022] Figure 7 illustrates an isometric view of right-hand side-plate, in accordance with an embodiment of the present subject matter.

[0023] Figure 8 illustrates the exploded view of right-hand side plate assembly, in accordance with an embodiment of the present subject matter.

[0024] Figure 9 illustrates an isometric view of a latch-system, in accordance with an embodiment of the present subject matter.

[0025] Figure 10 illustrates an exploded view of the latch-system, in accordance with an embodiment of the present subject matter.

[0026] Figure 11 illustrates an isometric view of a coupler system, in accordance with an embodiment of the present subject matter.

[0027] Figure 12 illustrates an exploded view of a coupler system, in accordance with an embodiment of the present subject matter.

[0028] Figure 13 illustrates an isometric view of a spring assembly, in accordance with an embodiment of the present subject matter.

[0029] Figure 14 illustrates an exploded view of a spring, in accordance with an embodiment of the present subject matter.

[0030] Figure 15 illustrates an isometric view of cam-charging pin assembly, in accordance with an embodiment of the present subject matter.

[0031] Figure 16 illustrates an exploded view of cam-charging pin assembly, in accordance with an embodiment of the present subject matter.

[0032] Figure 17 illustrates the charging cycle from start to end, in accordance with an embodiment of the present subject matter.

[0033] Figure 18 illustrates the mechanism ready to close position, in accordance with an embodiment of the present subject matter.

[0034] Figure 19 illustrates the mechanism ON position, in accordance with an embodiment of the present subject matter.

[0035] Figure 20 illustrates the mechanism OFF position, in accordance with an embodiment of the present subject matter.

[0036] Figure 21 illustrates the mechanism TOGGLE/ON position, in accordance with an embodiment of the present subject matter.

[0037] Figure 22 illustrates latch link biasing spring connected between spring pin and latch link joining pin, in accordance with an embodiment of the present subject matter.

[0038] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0039] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

[0040] Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0041] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

[0042] It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

[0043] By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.

[0044] Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.

[0045] It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

[0046] Referring now to figure 1,an isometric view of a four pole circuit breaker cassette (B) with breaker is illustrated. In one implementation, the circuit breaker cassette is a cassette on which stored energy mechanism module is mounted.

[0047] Referring now to figure 2, an isometric view of the four pole circuit breaker cassette (B) with a stored energy mechanism (A) in ready to assemble position is illustrated. In one implementation, the stored energy mechanism (A) is mounted on the four pole circuit breaker cassette (B) by using screws.

[0048] Referring now to figure 3, an isometric view of the stored energy mechanism (A) is illustrated.

[0049] Referring now to figure 4, an exploded view of the stored energy mechanism (A) mechanism is illustrated.

[0050] In one implementation, as shown in figure 3 and 4, the stored energy mechanism (A) consists of left-hand side plate assembly (1), right-hand side plate assembly (2), latch system (3), coupler system (4), spring assembly (5), cam assembly(6). All these sub-assemblies are coupled together by at least one coupling means that may include but not limited to riveting, screwing and the like. Each of the sub-assemblies further includes different parts having different functions and said parts are joined together by using the coupling techniques of riveting, screwing and the like.

[0051] Referring now to figure 5 an isometric view of a left-hand side plate is illustrated.

[0052] Referring now to figure 6 the exploded view of the left-hand side plate is illustrated.

[0053] In one implementation, the present invention provides an improved operating stored energy mechanism (A) to regulate ON/OFF operation of a molded case circuit breaker (MCCB). The mechanism module comprising: an operating handle (1h) means fixed onto a side plate (1) which drives a mechanism consisting of a cam means (6b) and compresses the main spring means (5a) by means of a charging link (4b). The stored spring energy /force can be further used for making and breaking the circuit during normal and abnormal condition. The latch system (3) consisting of latch link means (3a), upper link means (3b), a lower link means (3c), wherein the lower link means (3c) transfers the spring force stored in the main spring means (5a) to drive shaft (7) later. The latch bracket (1d) which latches or detaches by rotating the trip bar causes the ON and OFF operations of the breaker to achieve contact pressure.

[0054] In one implementation, the left-hand side plate (1) comprises a spring pin (1b), latch bracket (1d) which is allowed to rotate freely around a latch bracket pivot pin(1c), the latch bracket pivot pin(1c) is fixed on the left hand side plate(1a). The latch bracket (1d) also consists latch bracket roller pin (1i) which is allowed to rotate freely on the latch bracket roller pivot pin (1j). The roller pin (1i) is reduces the friction and wear during latching and de-latching operations. The off plate (1e) which is playing an important role during OFF operation is riveted on left hand side plate(1a) by means of two riveted pins. The off plate (1e) carries the off button (1f) which can be pushed to make the breaker in OFF condition.

[0055] In one implementation, the spring pin (1b) supports the entire spring assembly (5) as shown in figure 5 along with the handle (1h), and ratchet holder (1g) which is also riveted on the opposite side of left hand side plate (1a).

[0056] Referring now to figure 7, isometric view of right-hand side-plate (2) on the right side of the stored energy mechanism is illustrated. In one implementation, the right hand-side plate (2) contains several parts which are joined by using at least one of the techniques of riveting, screwing and the like as to perform as per their functions.

[0057] Referring now to figure 8 the exploded view of right-hand side plate assembly (2) is illustrated.

[0058] Referring now to figure 9 an isometric view of a latch-system (3) is illustrated. In one implementation the latch system consists of different kinds of links different kinds of links joined together by means of a latch-link joining pin (3d).

[0059] Referring now to figure 10 an exploded view of the latch-system (3) is illustrated. In one implementation, the latch system (3) consists of two lower link (3c), two upper links (3b), two latch link(3a), each of these are connected by means of a latch ink joining pin(3d).There are two bearing couplers(3e) are used to support the two bearing. The bearings are the part of the latch assembly (3) which reduces the friction and wear during CHARGING and TRIP operations. These bearings are mounted exactly on the pivot of latch system.

[0060] Referring now to Figure 11 an isometric view of a coupler system (4) is illustrated. In one implementation, the coupler system (4) is mounted on left hand side plate as shown in figure (3).The coupler system (4) is in middle portion of the energy stored mechanism and also supports the spring assembly (5) by means of floating pin (4c).

[0061] Referring now Figure 12 an exploded view of a coupler system (4) is illustrated. In one implementation, the coupler system consists of two charging links(4b) which are riveted to each other with floating pin (4c), two charging link stoppers (4g) and the main coupler (4a) in between the rigid pins (4f) which is used to mount the coupler system(4) on left hand side plate (1). The two coupler spacers (4h) are used to maintain the required center position of the coupler system (4) as shown in figure 3. The pin on (4e) is riveted on the charging link (4b) and is used to transfer all the spring force generated during ON cycle to latch system (4) through upper link (4b).

[0062] Referring now to figure 13 an isometric view of a spring assembly is illustrated.

[0063] Referring now to figure 14 an exploded view of the spring is illustrated. The spring assembly consists of main spring (5a), spring guide 1 (5b) and spring guide 2 (5c). The springs are held between the two coupler throughout the mechanical operations. The spring guide 1 (5b) and spring guide 2 (5c) are attached with main spring (5a) in between spring pin (1b) and floating pin (4c) respectively.

[0064] Referring now to Figure 15 an isometric view of cam-charging pin assembly is illustrated.

[0065] Referring now to figure 16 an exploded view of cam-charging pin assembly is illustrated. In one implementation, the cam-charging pin (6a) is held fixed and cam (6b), cam spacer, cam plate (6c) all are inserted one by one.

[0066] In one implementation, referring to figure 17, the charging cycle from start to end is illustrated. The charging operation may be required to compress the main spring (5a) in stages because the force required is too high to compress in a single operations so multiple cycles of charging is required. Charging operation may be completed within 7 to 8 strokes of the handle (1h) which can be mounted on left hand side plate (1a). As shown in figure 17, the different positions of charging cycles from start to end wherein the first figure shows the direction of the rotating cam (6b) which rotated by a handle (1h) in anticlockwise direction. In first figure it is observed that while rotating the handle (1h), the cam means (6b) pushes the charging pin (4d) in backward direction which is riveted on charging link (4b) at the same time. Due to force exerted by cam (6b), the charging link (4b) compresses the spring (5a). Finally after 7-8 strokes of the handle (1h), the main spring (5a) may achieve a full compressed state due to the rotation of cam means (6b) and the main spring gets locked on close D shaft (2d) by means of on bar (2c) as shown in the last diagram of figure 17.

[0067] In one implementation, referring now to figure 18, the mechanism in ready to close position is illustrated. As shown in the figure, the main means may be fully compressed to store energy/force.

[0068] In one implementation, referring now to figure 19, the mechanism in ON position is illustrated. During the ON position, the moving contacts (7b) are held fixed to the fixed contacts (7c) with sufficient pressure called as contact pressure. The contact pressure is required to achieve higher withstand as shown in figure18, the compression spring (5a) is fully compressed by the cam (6b) and it gets locked on close D shaft (2d) on bar (2c). When we press the on button (2b) as shown in figure 8, it releases the pressure/force on bar (2c) and hence the cam is released and it also allows the compression spring to expand. When the compression spring (5a) transfers the whole spring force to the charging link (4b) the pinion (4e) which is fixed on the charging link (4b) transfers all the spring force to the lower link means (3c) through upper link means (3b) and finally the force is transferred to shaft(7). Due to which the shaft rotates in high speed carrying the force and the moving contacts touches the fixed contacts with high impacts and the cycle gets completed.

[0069] In one implementation, referring now to figure 20 the mechanism in OFF position is illustrated. After the closing cycle is completed, the breaker may be ready to OFF, and hence the moving contacts (7a) are held fixed with the fixed contact (7c) due to contact pressure. At the same time there may also be backpressure which comes from the compression springs on moving contacts. The backpressure may be suffered by the latch system as shown in figure 19, the force can then transferred from shaft (7) to lower link (3c) then to upper link (3b) then to lath link (3a) and then from latch link(3a) to latch bracket(1d) to trip bar(2f). Now the latch bracket (1d) may get lock on the trip bar (2f), so the entire force can be transferred to the trip bar through different links. When the off button (1f) which is mounted on off plate (1e) which is fixed in left hand side plate (1a) as shown in figure(5) is pressed, it rotates the trip bar in clockwise direction and hence the contact between latch bracket(1d) and trip bar(2f) gets vanishes and latch bracket gets released due to which latch link (3a)moves in anticlockwise direction and hence the moving contact(7a) and fixed contacts(7c) gets open and the breaker reaches the OFF condition.

[0070] In one implementation, referring now to figure 21, the mechanism in TOGGLE/ON position is illustrated. When the mechanism is in TOGGLE position, the moving contacts (7b) are held fixed to the fixed contacts (7c) with sufficient pressure called as contact pressure. The contact pressure is required to achieve higher withstand during short circuit conditions when the current passes from the contacts thereby producing tremendous amount of backpressure. As shown in figure 21, the force exerted by the shaft (7) is then transferred to lower ink means (3c), upper link means (3b), lath link means (3a) and then from latch link means (3a) to latch roller (1i) to trip bar(2f) thereby enabling the latch bracket(1d) to get locked on the trip bar(2f). The force produces a moment on the latch link (3a) in anticlockwise direction and hence less force is then transferred to latch bracket (1d). So a condition may be formed that higher the force exerted by the drive shaft means(7) lesser will be the reaction on latch bracket (1d) due to which chances of opening or tripping the mechanism will become very less and hence the higher withstand of mechanism is achieved due to this arrangement.

[0071] Referring now to figure 22 latch link biasing spring connected between spring pin and latch link joining pin is illustrated.

[0072] In one implementation, as shown in figure 4 the spring assembly (5) may include two main compression springs positioned parallel to each other. In conventional techniques uses single concentric compression spring, that may help in larger spring force within the same volume. Conventional techniques faces the problem of improper distribution of spring force from charging link (4b) to drive shaft (7), in order to overcome the problem the present invention uses two latch links as a part of latch link assembly shown in figure10. The purpose of using two latch links is to design the system for larger spring force. Conventional techniques also faced the problem of improper distribution of trip force from latch link (3a) to latch bracket (7), so to overcome the problem the present invention uses two latch brackets as a part of latch bracket assembly shown in figure 6.

[0073] In one implementation, the coupler system (4) is arranged in manner to withstand the high mechanism spring forces and to lock and/or unlock the cam means. The coupler system also comprises the triangular shaped coupler (4a) so as to hold a charging link (4b) fixed as well as acting its pivot point means adapted to lock and/or unlock the cam means (6b). A roller pin (4d) in the coupling system (4), rotates and acts as a bearing in charging operation to reduce the wear and friction.

[0074] In one implementation, the latch system (3) comprising two latch links means (3a), two upper links (3b) and two lower links (3c), adapted to withstand the high mechanism spring forces and joined together by latch link joining pin (3d) due to which the two pairs are acting like a single entity throughout the ON/OFF/CHARGING operations. Further the improved latch system comprises at least two bearing couplers holding the bearings which are used to accommodate high forces and reduce the friction and wear.

[0075] In one implementation, the improved operating store energy mechanism includes two main compression springs which are located in between spring coupler (5b and 5c) to avoid buckling of main spring
[0076] Some of the benefits achieved by the present invention are mentioned below:
1. The present invention enables higher rotation of moving contact to achieve higher breaking capacity.
2. The present invention reduces the handle force required to charge the high force main spring
3. The present invention involves less number of components for better operating mechanism of circuit breaker.
4. The present invention involves better ergonomic considerations.
5. The present invention delivers high force without compromising on life of spring.
6. The present invention delivers high contact pressure with low main spring force spring force.
7. The present invention involves no nuisance tripping in shock and vibration tests.
8. The present invention provides high mechanical life.
,CLAIMS:1. A stored energy mechanism module (A) to regulate at least one ON or OFF operation of at least one molded case circuit breaker (MCCB) under normal and abnormal circuit condition, said stored energy mechanism module comprising:

at least two side-plate assembly (1 and 2) comprises of at least one operating handle (1h) to drive the said stored energy mechanism module;
at least one cam assembly (6) operably coupled with said side-plate assembly, comprises of at least one cam means (6b), wherein said cam means (6b) rotated by means of one or more force received by said operating handle (1h);
at least one coupler system (4) mounted on said side-plate assembly, comprises of at least two charging links (4b) to guide at least one spring assembly (5);
said spring assembly (5) comprises of at least one main spring means (5a) to store energy/force due to rotation of said cam means (6b), and thereby transfer said energy/force to at least one latch system (3) for regulating said ON or OFF operation of said MCCB;
said latch system (3) comprises of at least two latch link means (3a), at least two upper link means (3b), and at least two lower link means (3c), wherein said lower link means (3c) adapted to receive said energy stored in said main spring means (5a) to actuate at least one drive shaft means (7) and subsequently enable latching or de- latching of at least one latch bracket (1d) by rotating at least one trip bar (2f) during said ON or OFF operation of said MCCB.

2. The stored energy mechanism module as claimed in claim 1, wherein said spring assembly (5) held by means of at least one spring pin (1b) mounted on said side plate assembly (1).

3. The stored energy mechanism module as claimed in claim 1, wherein said latch link means (3a), said upper link means (3b), and said lower link means (3c), coupled to each other by means of latch link joining pin (3d).

4. The stored energy mechanism module as claimed in claim 3 and 2, comprises at least one latch link biasing return spring coupled to said spring pin (1b) at one end and said latch link joining pin (3d) at other end.

5. The stored energy mechanism module as claimed in claim 1, wherein said coupler system (4) further comprises at least two coupler spacers (4h) to maintain said coupler system (4) in a center position when mounted on said side plate assembly.

6. The stored energy mechanism module as claimed in claim 5, wherein said coupler system (4) having said charging link (4b) includes one or more pinion (4e) to transfer said energy/force from said main spring means to said latch system (3).

7. The stored energy mechanism module as claimed in claim 1, comprises at least one ON plate and at least one OFF plate mounted on said side plate assembly (1 and 2), wherein said ON plate include at least one ON switch to actuate said ON condition and said OFF plate includes at least one OFF switch to actuate said OFF condition.

8. The stored energy mechanism module as claimed in claim 1, wherein said latch system (3) adjusted to:
receive, by means of said latch link means (3a), said energy/force from said main spring means (5a); and thereby
transfer said energy/force from said latch link means (3a) to said lower link latch system (3c) through upper link latch means (3b).

9. The stored energy mechanism module as claimed in claim 1, wherein during ON operation of said MCCB, said actuation of said drive shaft means (7) enable rotation of said trip bar (2f) in at least one direction.

10. The stored energy mechanism module as claimed in claim 9, wherein said rotation of said trip bar (2f) enable said latching of said latch bracket (1d) to achieve contact pressure between at least one moving contact and at least one fixed contact of said MCCB.

11. The stored energy mechanism module as claimed in claim 10, wherein during OFF operation of said MCCB, said latch bracket (1d) de-latches with said trip bar (2f) due to rotation of said trip bar (2f) in at least one reverse direction, and thereby enable separation of said moving contact and said fixed contact of said MCCB.

12. The stored energy mechanism module as claimed in claim 1, wherein said latch bracket (1d) comprises at least one latch bracket roller pin (1i) adapted to rotate said latch bracket (1d) along at least one latch bracket roller pivot pin (1j).

13. The stored energy mechanism module as claimed in claim 1, wherein said main spring means (5a) preferably includes main compression spring adjusted to compress while storing said energy/force and expand while releasing said energy/force to said latch system (3).

14. The stored energy mechanism module as claimed in claim 13, wherein said main spring means (5a) held by means at least two spring couplers (5b and 5c) to avoid buckling of said main spring means.