Tripping combination module for molded case circuit breaker

Abstract

The invention relates to the technical field of molded case circuit breakers, and discloses a tripping combination module for a molded case circuit breaker, which comprises a bottom case, a cover, a shunt tripping mechanism, an auxiliary rod, a driving rod and two first microswitches, a first movable hole is formed in the lower end of the auxiliary rod, a first movable shaft is inserted into the first movable hole, a first driving part is arranged on the upper portion of the auxiliary rod, and two connecting arm parts are arranged at one end of the driving rod; the auxiliary rod is located below the shunt tripping mechanism, the two ends of the first movable shaft are inserted into second shaft holes correspondingly formed in the two connecting arm parts respectively, and the first driving part penetrates through an extending opening correspondingly formed in the shell and extends out of the shell. And the two first microswitches are respectively arranged above and below the driving rod. According to the shunt tripping mechanism, the axial width of the tripping combination module in the shunt tripping mechanism is reduced, and the application range of the tripping combination module is widened.

Description

A tripping combination module for molded case circuit breakers Technical Field

[0001] This invention relates to the field of molded case circuit breakers, and in particular to a tripping combination module for molded case circuit breakers. Background Technology

[0002] Molded case circuit breakers (MCCBs) are core protective electrical devices in low-voltage power distribution systems. They are named for their core components, such as contacts and arc-extinguishing systems, which are encased in a thermosetting plastic housing. They offer multiple functions including short-circuit protection, overload protection, and undervoltage protection, and are widely used in industrial, building, and residential power distribution applications. Their compact structure mainly consists of a plastic housing, operating mechanism, contact system, arc-extinguishing chamber, and trip unit. MCCBs can quickly disconnect the circuit and cut off the faulty power supply when overload, short circuit, or undervoltage faults occur, preventing equipment damage and safety accidents.

[0003] Publication number CN218957645U discloses a combined accessory and a circuit breaker. The circuit breaker includes the combined accessory, which includes a housing, a trip unit disposed within the housing, and at least two micro switches. It also includes a first push rod movably mounted within the housing. The at least two micro switches are disposed on the same side of the first push rod, one of which is connected to the trip circuit driving the trip unit to control the on / off state of the trip circuit. The first push rod includes at least two first trigger parts and a first drive part extending out of the housing. The at least two micro switches are stacked along the moving direction of the first push rod, and the trigger buttons of the at least two micro switches extend onto the moving paths of the at least two first trigger parts of the first push rod.

[0004] Publication number CN221201044U discloses a modular mounting base and a combined module for molded case circuit breakers. The modular mounting base includes a base body and a cover. The base body is provided with a first mounting position for mounting a shunt trip mechanism, a second mounting position for mounting an alarm switch mechanism, and a third mounting position for mounting an auxiliary switch mechanism. The first mounting position and the cover cover the base body and cover the first mounting position, the second mounting position, and the third mounting position.

[0005] In existing technologies, the auxiliary switching mechanism in the accessory is a linear drive, generally installed along the axial direction of the shunt trip unit and on the side of the shunt trip unit. This results in a large width of the accessory along the axial direction of the shunt trip unit, which cannot match the size requirements of some molded case circuit breakers, thus limiting its application range. Therefore, we provide a tripping combination module for molded case circuit breakers. Summary of the Invention

[0006] The purpose of this invention is to provide a tripping assembly module for molded case circuit breakers to solve the problems existing in the prior art.

[0007] The technical solution adopted by this invention to solve its technical problem is: a tripping assembly module for a molded case circuit breaker, comprising a bottom shell, a cover, and a shunt tripping mechanism. The bottom shell and the cover form a housing, and the shunt tripping mechanism is installed inside the housing. It also includes an auxiliary rod, a drive rod, and two first microswitches. The upper part of the auxiliary rod has a first shaft hole, into which a first connecting shaft is inserted. A first torsion spring is sleeved on the first connecting shaft. The lower end of the auxiliary rod has a first movable hole, which is an oblong hole, into which a first movable shaft is inserted. The upper part of the auxiliary rod has a first drive section, and one end of the drive rod has two connecting arms.

[0008] The auxiliary rod is located below the shunt trip mechanism. The two ends of the first connecting shaft are inserted into corresponding shaft grooves on the bottom shell and the cover, respectively. The two legs of the first torsion spring abut against the bottom shell and the auxiliary rod, respectively. The two ends of the first movable shaft are inserted into corresponding second shaft holes on the two connecting arms. The first drive unit extends out of the housing through a corresponding protrusion. The drive rod is horizontally positioned, with one connecting arm slidably positioned within a horizontal groove on the inner surface of the bottom shell, and the other connecting arm abutting against and sliding relative to the inner surface of the cover. This, in conjunction with the horizontal groove, ensures that the drive rod can only move in a straight line. Two first microswitches are respectively positioned above and below the drive rod.

[0009] The first drive unit rotates under the push of the circuit breaker's shaft, causing the auxiliary rod to rotate. The auxiliary rod then drives the drive rod to move laterally, triggering two first microswitches to indicate the circuit breaker's on and off states. Furthermore, the auxiliary rod, drive rod, and two first microswitches are all located below the shunt trip mechanism, which reduces the axial width of the trip assembly module within the shunt trip mechanism.

[0010] Furthermore, the shunt trip mechanism includes a shunt trip unit, a linkage rod, and a trip rod. The moving iron core of the shunt trip unit has a limiting part at its end. The upper part of the linkage rod has a third shaft hole, in which a second connecting shaft is inserted. A second torsion spring is sleeved on the second connecting shaft. The lower part of the linkage rod has two linkage arms. The inner end of the trip rod has a second movable hole, which is an oblong hole. A second movable shaft is inserted into the second movable hole. The outer end of the trip rod has a hook. The shunt trip unit's axis is horizontally arranged, and its front and rear snap-fit ​​connectors are respectively snapped into the corresponding snap-fit ​​interfaces on the bottom shell and the cover. The two ends of the second connecting shaft are respectively inserted into the corresponding insertion holes on the shunt trip unit. The two legs of the second torsion spring abut against the linkage rod and the shunt trip unit respectively. The moving iron core of the shunt trip unit passes through the gap between the two linkage arms. The diameter of the limiting part is larger than the width of the gap between the two linkage arms, and the diameter of the rod part of the moving iron core is smaller than the width of the gap. The second movable shaft passes through the second movable hole, and its two ends are inserted into the corresponding fourth shaft holes at the bottom of the two linkage arms. The outer end of the trip rod extends out of the housing through the sliding port provided on the housing.

[0011] When a circuit breaker tripping operation is required, the remotely controlled shunt trip unit is activated, causing the moving iron core to retract. The moving iron core, through a limiting part, drives the linkage rod to rotate. The linkage rod then drives the trip rod to slide within the sliding port, thereby tripping the circuit breaker through the hook of the trip rod. By setting up the linkage rod, the moving iron core of the shunt trip unit only needs to move a short distance to trip the circuit breaker by driving the trip rod through the linkage rod, thus reducing the axial width of the tripping assembly module in the shunt trip unit.

[0012] Furthermore, each of the two first microswitches is provided with two first mounting holes, and the first mounting holes of the first microswitches are fitted onto the mounting shafts corresponding to the inner surface of the bottom shell, which facilitates disassembly and installation.

[0013] Furthermore, it also includes an alarm mechanism, which comprises an alarm rod, a second micro switch, and a return spring. The outer surface of the base shell has a mounting groove, and the outer end of the alarm rod has a fifth shaft hole into which a third connecting shaft is inserted. The outer sidewall of the alarm rod extends outward to form a second driving part. The alarm rod is positioned within the mounting groove, and the upper and lower ends of the return spring abut against the inner end of the alarm rod and the inner bottom surface of the mounting groove, respectively. The second micro switch is located above the inner end of the alarm rod. When a circuit breaker malfunctions, this alarm mechanism will emit an alarm signal, thereby quickly eliminating the circuit breaker fault.

[0014] Furthermore, the second micro switch is provided with two second mounting holes, which are fitted onto the corresponding mounting shaft on the bottom shell for easy disassembly and installation.

[0015] Furthermore, the inner bottom surface of the alarm rod is provided with a first limiting post, and the inner bottom surface of the mounting groove is provided with a second limiting post. The upper and lower ends of the reset spring are respectively sleeved on the first limiting post and the second limiting post, which can prevent the reset spring from coming out.

[0016] Furthermore, it also includes a small cover that covers the second micro switch and the reset spring. The two ends of the third connecting shaft are respectively inserted into the shaft grooves provided on the small cover and the bottom shell, which can protect them.

[0017] Furthermore, the small cover is connected to the bottom shell by a snap-fit, making it easy to disassemble and install.

[0018] Furthermore, the second drive unit protrudes beyond the coverage area of ​​the small cover.

[0019] Furthermore, the bottom shell and the cover are connected by snap-fit, making them easy to disassemble and install.

[0020] The beneficial effects of this invention are as follows: 1. By setting the auxiliary rod and the drive rod below the shunt trip mechanism and using the linear motion of the drive rod to trigger the upper and lower micro switches simultaneously, the traditional structure of arranging the micro switches side by side along the axial direction of the shunt trip device is improved, saving axial space and enabling this module to adapt to more circuit breakers with limited size, thus significantly expanding the application range.

[0021] 2. In the shunt trip mechanism, the short-distance linear motion of the moving iron core is converted into the long-distance linear motion of the trip lever through the intermediate motion of rotation. This not only changes the direction of motion but also amplifies the displacement. This allows for the selection of a smaller shunt trip unit with a shorter stroke, further helping to reduce the overall size of the module. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the exploded structure of the present invention; Figure 3 is a schematic diagram of the structure of the alarm mechanism of the present invention; Figure 4 is a schematic diagram of the internal structure of the present invention; Figure 5 is a schematic diagram of the shunt tripping mechanism of the present invention; Figure 6 is a schematic diagram of the exploded structure of the shunt tripping mechanism of the present invention; Figure 7 is a schematic diagram of the structure of the auxiliary rod, the drive rod, and the two first micro switches of the present invention; Figure 8 is a schematic diagram of the exploded structure of the auxiliary rod, the drive rod, and the two first micro switches of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Bottom shell; 11. Mounting groove; 111. Second limiting post; 12. Mounting shaft; 13. Protrusion; 14. Transverse sliding groove; 15. Snap-fit ​​interface; 16. Sliding port; 2. Cover; 3. Shunt trip mechanism; 31. Shunt trip device; 311. Moving iron core; 312. Limiting part; 313. Snap-fit ​​interface; 32. Linkage rod; 321. Third shaft hole; 322. Second connecting shaft; 323. Second torsion spring; 324. Linkage arm; 325. Fourth shaft hole; 33. Tripping rod; 331. Second movable hole; 332. Second movable shaft 333. Hook; 4. Auxiliary rod; 41. First shaft hole; 42. First connecting shaft; 43. First torsion spring; 44. First movable hole; 45. First movable shaft; 46. First drive part; 5. Drive rod; 51. Connecting arm part; 512. Second shaft hole; 6. First micro switch; 61. First mounting hole; 7. Alarm mechanism; 71. Alarm rod; 711. Fifth shaft hole; 712. Third connecting shaft; 713. Second drive part; 714. First limit post part; 72. Second micro switch; 721. Second mounting hole; 73. Return spring; 8. Small cover. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0025] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0026] As shown in Figures 1, 4, 7, and 8, a tripping assembly module for a molded case circuit breaker includes a base shell 1, a cover 2, and a shunt tripping mechanism 3. The base shell 1 and cover 2 form a housing, and the shunt tripping mechanism 3 is installed inside the housing. It also includes an auxiliary rod 4, a drive rod 5, and two first microswitches 6. The upper part of the auxiliary rod 4 has a first shaft hole 41, into which a first connecting shaft 42 is inserted. A first torsion spring 43 is sleeved on the first connecting shaft 42. The lower end of the auxiliary rod 4 has a first movable hole 44, which is an oblong hole, into which a first movable shaft 45 is inserted. The upper sidewall of the auxiliary rod 4 extends outward to form a first driving part 46. One end of the drive rod 5 has two connecting arms 51.

[0027] The auxiliary rod 4 is located below the shunt tripping mechanism 3. The two ends of the first connecting shaft 42 are respectively inserted into the corresponding shaft grooves on the bottom shell 1 and the cover 2. The two legs of the first torsion spring 43 abut against the bottom shell 1 and the auxiliary rod 4, respectively. The two ends of the first movable shaft 45 are respectively inserted into the corresponding second shaft holes 512 of the two connecting arms 51. The first driving part 46 extends out of the shell through the corresponding extension opening 13. The driving rod 5 is arranged laterally. One connecting arm 51 is slidably disposed in the transverse sliding groove 14 on the inner surface of the bottom shell 1, and the other connecting arm 51 abuts against the inner surface of the cover 2 and can slide relative to it. This, in conjunction with the transverse sliding groove 14, ensures that the driving rod 5 can only perform linear movement. Two first microswitches 6 are respectively disposed above and below the driving rod 5.

[0028] The first drive unit 46 rotates under the push of the circuit breaker's shaft, causing the auxiliary rod 4 to rotate. The auxiliary rod 4 then drives the drive rod 5 to move laterally, triggering the two first micro switches 6, thereby indicating the on and off states of the circuit breaker. Furthermore, the auxiliary rod 4, drive rod 5, and two first micro switches 6 are all located below the shunt trip mechanism 3, which can reduce the width of the trip combination module in the axial direction of the shunt trip mechanism 3.

[0029] As shown in Figures 5 and 6, the shunt trip mechanism 3 includes a shunt trip unit 31, a linkage rod 32, and a trip rod 33. The moving iron core 311 of the shunt trip unit 31 has a limiting part 312 at its end. The upper part of the linkage rod 32 has a third shaft hole 321, in which a second connecting shaft 322 is inserted. A second torsion spring 323 is sleeved on the second connecting shaft 322. The lower part of the linkage rod 32 has two linkage arms 324. The inner end of the trip rod 33 has a second movable hole 331, which is an oblong hole. A second movable shaft 332 is inserted into the second movable hole 331. The outer end of the trip rod 33 has a hook part 333. The axis of the shunt trip unit 31 is arranged laterally and perpendicular to the longitudinal centerline of the bottom shell 1. The snap-fit ​​connectors 313 on its front and rear sides are respectively snapped into the snap-fit ​​interfaces 15 provided on the bottom shell 1 and the cover 2. The two ends of the second connecting shaft 322 are respectively inserted into the corresponding insertion holes on the shunt trip unit 31. The two legs of the second torsion spring 323 abut against the linkage rod 32 and the shunt trip unit 31 respectively. The moving iron core 311 of the shunt trip unit 31 passes through the gap between the two linkage arms 324. The diameter of the limiting part 312 is larger than the width of the gap between the two linkage arms 324, and the diameter of the rod part of the moving iron core 311 is smaller than the width of the gap. The second movable shaft 332 passes through the second movable hole 331, and its two ends are inserted into the fourth shaft hole 325 provided at the bottom of the two linkage arms 324 respectively. The outer end of the trip rod 33 extends out of the shell through the sliding port 16 provided on the shell.

[0030] When a circuit breaker tripping operation is required, the remotely controlled shunt trip unit 31 is activated, causing the moving iron core 311 to retract. The moving iron core 311 drives the linkage rod 32 to rotate via the limiting part 312. The linkage rod 32 drives the trip rod 33 to slide within the sliding port 16, thereby tripping the circuit breaker through the hook part 333 of the trip rod 33. By setting the linkage rod 32, the moving iron core 311 of the shunt trip unit 31 only needs to move a short distance to trip the circuit breaker by driving the trip rod 33 through the linkage rod 32, thus reducing the axial width of the tripping assembly module in the shunt trip unit 31. During installation, the moving iron core 311 of the shunt trip unit 31 is first inserted from below into the gap between the two linkage arms 324. Then, the second movable shaft 332 is passed through the second movable hole 331 and the fourth shaft hole 325 correspondingly provided at the bottom of the two linkage arms 324. By setting the diameter of the limiting part 312 to be larger than the gap width between the two linkage arms 324, the moving iron core 311 can drive the linkage rod 32 to rotate through the limiting part 312. By setting the diameter of the rod part of the moving iron core 311 to be smaller than the gap width, the moving iron core 311 of the split trip trip device 31 can enter the gap between the two linkage arms 324 from below.

[0031] Each of the two first microswitches 6 has a first mounting hole 61. The first mounting hole 61 of the first microswitch 6 is fitted onto the mounting shaft 12 corresponding to the inner surface of the bottom shell 1, which facilitates disassembly and installation.

[0032] As shown in Figures 2 and 3, the system also includes an alarm mechanism 7, which comprises an alarm rod 71, a second micro switch 72, and a return spring 73. The outer surface of the base shell 1 has a mounting groove 11. The outer end of the alarm rod 71 has a fifth shaft hole 711, into which a third connecting shaft 712 is inserted. The outer sidewall of the alarm rod 71 extends outward to form a second driving part 713. The alarm rod 71 is located within the mounting groove 11. The two ends of the third connecting shaft 712 are respectively inserted into the small cover 8 and the corresponding shaft grooves on the base shell 1. The upper and lower ends of the return spring 73 abut against the inner end of the alarm rod 71 and the inner bottom surface of the mounting groove 11, respectively. The second micro switch 72 is located above the inner end of the alarm rod 71. When the circuit breaker malfunctions, the alarm mechanism 7 will issue an alarm signal, thereby quickly eliminating the circuit breaker malfunction.

[0033] The second micro switch 72 is provided with two second mounting holes 721. The second mounting holes 721 of the second micro switch are fitted onto the mounting shaft portion 12 corresponding to the bottom shell 1, which facilitates disassembly and installation.

[0034] The inner bottom surface of the alarm rod 71 is provided with a first limiting post 714, and the inner bottom surface of the mounting groove 11 is provided with a second limiting post 111. The upper and lower ends of the reset spring 73 are respectively sleeved on the first limiting post 714 and the second limiting post 111, which can prevent the reset spring 73 from coming out.

[0035] As shown in Figure 2, it also includes a small cover 8, which covers the second micro switch 72 and the reset spring 73, thus protecting them.

[0036] The small cover 8 is connected to the bottom shell 1 by a snap-fit, making it easy to disassemble and install.

[0037] The second drive unit 713 is exposed outside the coverage area of ​​the small cover 8.

[0038] The bottom shell 1 and the cover 2 are connected by snap-fit. All parts in this invention can be disassembled and modularly assembled, making it easy to replace and repair after damage, thus reducing maintenance costs.

[0039] The above embodiments are only some embodiments of the present invention, and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

Claims

1. A tripping assembly module for a molded case circuit breaker, comprising a base shell (1), a cover (2), and a shunt tripping mechanism (3), wherein the base shell (1) and the cover (2) form a housing, and the shunt tripping mechanism (3) is installed inside the housing; characterized in that, It also includes an auxiliary rod (4), a drive rod (5), and two first micro switches (6); the upper part of the auxiliary rod (4) is provided with a first shaft hole (41), a first connecting shaft (42) is inserted into the first shaft hole (41), a first torsion spring (43) is sleeved on the first connecting shaft (42), the lower end of the auxiliary rod (4) is provided with a first movable hole (44), a first movable shaft (45) is inserted into the first movable hole (44), the upper part of the auxiliary rod (4) is provided with a first drive part (46), one end of the drive rod (5) is provided with two connecting arms (51); the auxiliary rod (4) is located below the shunt tripping mechanism (3), the two ends of the first connecting shaft (42) are respectively inserted into the corresponding shaft grooves on the bottom shell (1) and the cover (2), the... The two legs of the first torsion spring (43) abut against the bottom shell (1) and the auxiliary rod (4) respectively. The two ends of the first movable shaft (45) are respectively inserted into the second shaft holes (512) corresponding to the two connecting arms (51). The first drive part (46) extends to the outside of the shell through the corresponding protrusion (13) on the shell. The drive rod (5) is arranged horizontally. One of the connecting arms (51) is slidably arranged in the horizontal groove (14) provided on the inner surface of the bottom shell (1). The other connecting arm (51) abuts against the inner surface of the cover (2) and can slide relative to it. Thus, in conjunction with the horizontal groove (14), the drive rod (5) can only move in a straight line. The two first micro switches (6) are respectively arranged above and below the drive rod (5).

2. The tripping assembly module for a molded case circuit breaker according to claim 1, characterized in that: The shunt trip mechanism (3) includes a shunt trip unit (31), a linkage rod (32), and a trip rod (33); the moving iron core (311) of the shunt trip unit (31) has a limiting part (312) at its end, the upper part of the linkage rod (32) has a third shaft hole (321), a second connecting shaft (322) is inserted into the third shaft hole (321), a second torsion spring (323) is sleeved on the second connecting shaft (322), and the linkage rod (33) The lower part of the trip lever (32) is provided with two linkage arms (324). The inner end of the trip lever (33) is provided with a second movable hole (331). The second movable hole (331) is a waist-shaped hole. A second movable shaft (332) is inserted into the second movable hole (331). The outer end of the trip lever (33) is provided with a hook (333). The axis of the shunt trip device (31) is arranged horizontally. The snap-fit ​​connectors (313) on its front and rear sides are respectively snapped into the bottom shell. 1) The card interface (15) corresponding to the cover (2) is inserted into the corresponding insertion hole on the shunt trip device (31) at both ends of the second connecting shaft (322). The two legs of the second torsion spring (323) abut against the linkage rod (32) and the shunt trip device (31) respectively. The moving iron core (311) of the shunt trip device (31) passes through the gap between the two linkage arms (324). The diameter of the limiting part (312) is greater than the width of the gap between the two linkage arms (324). The diameter of the rod part of the moving iron core (311) is smaller than the width of the gap. The second movable shaft (332) passes through the second movable hole (331) and its two ends are inserted into the fourth shaft hole (325) corresponding to the bottom of the two linkage arms (324). The outer end of the trip rod (33) extends out of the housing through the sliding port (16) provided on the housing.

3. The tripping assembly module for a molded case circuit breaker according to claim 1, characterized in that: Two first microswitches (6) are provided with two first mounting holes (61), and the first mounting holes (61) of the first microswitches (6) are fitted onto the mounting shaft (12) correspondingly provided on the inner surface of the bottom shell (1).

4. The tripping assembly module for a molded case circuit breaker according to claim 1, characterized in that: It also includes an alarm mechanism (7), which includes an alarm rod (71), a second micro switch (72), and a return spring (73); the outer surface of the bottom shell (1) is provided with a mounting groove (11), the outer end of the alarm rod (71) is provided with a fifth shaft hole (711), a third connecting shaft (712) is inserted into the fifth shaft hole (711), and the outer side wall of the alarm rod (71) extends outward to form a second driving part (713); the alarm rod (71) is located in the mounting groove (11), the upper end and the lower end of the return spring (73) abut against the inner end of the alarm rod (71) and the inner bottom surface of the mounting groove (11), respectively, and the second micro switch (72) is located above the inner end of the alarm rod (71).

5. A tripping assembly module for a molded case circuit breaker according to claim 4, characterized in that: The second micro switch (72) is provided with two second mounting holes (721), and the second mounting holes (721) of the second micro switch are sleeved on the mounting shaft (12) correspondingly provided on the bottom shell (1).

6. The tripping assembly module for a molded case circuit breaker according to claim 4, characterized in that: The inner bottom surface of the alarm rod (71) is provided with a first limiting post (714), and the inner bottom surface of the mounting groove (11) is provided with a second limiting post (111). The upper and lower ends of the reset spring (73) are respectively sleeved on the first limiting post (714) and the second limiting post (111).

7. A tripping assembly module for a molded case circuit breaker according to claim 4, characterized in that: It also includes a small cover (8) that covers the second micro switch (72) and the reset spring (73), and the two ends of the third connecting shaft (712) are respectively inserted into the shaft grooves provided on the small cover (8) and the bottom shell (1).

8. A tripping assembly module for a molded case circuit breaker according to claim 7, characterized in that: The small cover (8) is connected to the bottom shell (1) by a snap fastener.

9. A tripping assembly module for a molded case circuit breaker according to claim 7, characterized in that: The second drive unit (713) is exposed outside the coverage area of ​​the small cover (8).

10. A tripping assembly module for a molded case circuit breaker according to claim 1, characterized in that: The bottom shell (1) and the cover (2) are connected by a snap fastener; the first movable hole (44) is an oblong hole.

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