Tripping structure of molded case circuit breaker

Abstract

The utility model discloses a molded case circuit breaker tripping structure which comprises an operating mechanism and an electronic tripper which are arranged at the top of an upper cover, the top of the upper cover is provided with a first groove located below the operating mechanism, and the electronic tripper is installed in the first groove and matched with a tripping rod of the operating mechanism. The tripping rod is provided with a tripping part which extends to the first groove and is opposite to the electronic tripper, and the electronic tripper is provided with an ejector rod structure which drives the tripping part to rotate when being triggered. By adopting the technical scheme, the mounting position requirement of the electronic release on the upper cover is met by reasonably utilizing the position space of the groove, the mounting height is reduced, the electronic release can be well mounted and matched with a release rod, and when faults such as overload, voltage loss, under-voltage or short circuit of a load circuit are detected, the electronic release can be prevented from being damaged. The electronic tripper drives the tripping rod to rotate through the push rod structure, and then triggers the operation mechanism to execute the tripping action so as to realize the tripping and opening of the circuit breaker, thereby guaranteeing the safety of lines and equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a tripping structure of a molded case circuit breaker. Background Art

[0002] Currently, with the promotion of smart grids, electronic molded case circuit breakers (ECCBs) are widely used in power distribution lines for infrequent switching and motor protection. They offer long-delay inverse overload, short-delay inverse short-circuit, short-delay definite short-circuit, instantaneous short-circuit, and undervoltage protection, protecting power lines and power equipment from damage. Existing EMCCBs use electronic trip units instead of traditional instantaneous and overload tripping mechanisms. These electronic trip units activate the circuit breaker's tripping mechanism, thereby protecting the line.

[0003] The existing electronic molded case circuit breaker mainly includes a base, an upper cover, an electronic trip unit, a controller, a contact mechanism, an operating mechanism, etc. The electronic trip unit is installed in the internal space between the base and the middle cover. Specifically, the electronic trip unit is fixed to the top of the base by screws and is installed above one of the phase conductive copper buses. This installation method requires multiple fixing columns for installing the electronic trip unit on the base. The installation structure is complex and the installation occupies a large space, making the internal space between the base and the middle cover narrower and more crowded, making installation and maintenance more inconvenient, and the assembly efficiency is low, which increases production costs. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art that the electronic trip unit is installed between the base and the middle cover through multiple fixing columns, which takes up a large installation space, is inconvenient to install and maintain, has low assembly efficiency, and increases production costs.

[0005] In order to solve the above technical problems, the present invention provides a molded case circuit breaker tripping structure, comprising:

[0006] The shell structure includes a base, an upper cover and a cover;

[0007] The operating mechanism is detachably arranged on the top of the upper cover, and includes a mechanism bracket fixed to the upper cover and a trip rod rotatably arranged on the mechanism bracket; a rotating shaft connecting the operating mechanism and the contact arm is rotatably arranged on the top of the upper cover; a first groove is provided on the top of the upper cover below the operating mechanism, an electronic trip device is provided in the first groove, the trip rod has a trip part extending to the first groove and opposite to the electronic trip device, and the electronic trip device has a top rod structure that moves toward the side of the trip part when triggered, so that the trip rod is tripped and rotated when the trip part is driven by the top rod structure.

[0008] As a preferred solution, the tripping portion includes a tripping plate provided on the tripping rod and extending downward into the first groove, and the tripping plate is located on the moving path of the top rod structure.

[0009] As a preferred solution, a limiting pressure plate is provided in the first groove to form a limiting cooperation with the electronic release, and the limiting pressure plate cooperates with the side wall of the first groove to form a limiting interval for limiting the electronic release.

[0010] As a preferred solution, the limiting pressure plate includes an upper baffle portion that abuts against the opening of the first groove, and a front baffle portion and a rear baffle portion that are staggered on both sides of the upper baffle portion and inserted into the first groove. One end of the rear baffle portion is an arc structure and cooperates to abut against the side wall of the electronic release. The front baffle portion cooperates to abut against the front end of the electronic release and is provided with a U-shaped opening for the top rod structure to pass through.

[0011] As a preferred solution, both ends of the upper baffle portion are fixed between the mechanism bracket and the top of the upper cover.

[0012] As a preferred solution, a controller located on one side of the operating mechanism is also installed on the top of the upper cover, and the electronic release is electrically connected to the controller.

[0013] As a preferred solution, three groove structures are provided at intervals on the top of the upper cover, and the three groove structures respectively include a first groove on which the electronic release is installed and two second grooves arranged on both sides of the first groove. Lead grooves are respectively provided between the first groove and the two second grooves. The controller is arranged above one of the second grooves, so that the connecting wire of the electronic release extends through the lead groove to the second groove and is connected to the controller.

[0014] As a preferred solution, three interphase slots are provided between the base and the upper cover, and also include three moving contacts, three static contacts and three current transformers respectively arranged in the three interphase slots. The three groove structures are respectively provided with lead holes connecting the three interphase slots, so that the detection circuits of the three transformer devices pass through the lead holes into the three groove structures, and extend through the lead slots to be connected to the controller.

[0015] As a preferred embodiment, the moving contact has a contact arm extending upward from the top of the upper cover, and the top of the upper cover is provided with a connecting window for the contact arm to pass through. The operating mechanism includes a lower connecting rod connected to the rotating shaft, and the rotating shaft includes a crank arm structure hingedly connected to the lower connecting rod and the contact arm respectively.

[0016] As a preferred solution, two opposing support plates are provided on the side panels on both sides of the mechanism bracket; or two opposing support plates are provided on the top of the upper cover, and the two support plates are oppositely provided with two rotating shaft holes for the rotating shaft to pass through, and the rotating shaft is rotatably passed through the two support plates through the rotating shaft holes and is located between the mechanism bracket and the upper cover.

[0017] Compared with the existing technology, the technical solution of this utility model has the following advantages:

[0018] 1. In the tripping structure of the molded case circuit breaker provided by the present invention, the operating mechanism and the rotating shaft structure are independently and detachably mounted on the top of the upper cover, and the electronic trip unit is mounted in the first groove on the top of the upper cover. The trip rod has a trip plate that extends into the first groove and cooperates with the electronic trip unit. In this way, the electronic trip unit is located just below the operating mechanism. By rationally utilizing the position space of the groove, the installation position requirement of the electronic trip unit on the upper cover is met without occupying the space of the accommodation cavity. At the same time, the installation height is reduced, and the trip rod can be well installed and matched. The overall structure is more compact and easy to install and disassemble. The modular and convenient installation of the electronic trip unit at the upper cover position improves the installation efficiency. The electronic trip unit has high sensitivity and relatively accurate action value. When overload, loss of voltage, undervoltage or short circuit faults are detected in the load circuit, the controller of the molded case circuit breaker will control the action of the electronic trip unit, so that the electronic trip unit drives the trip rod to rotate through the top rod structure, and then triggers the operating mechanism to perform the tripping action to realize the tripping and opening of the circuit breaker, so as to avoid endangering the safety of personnel and the normal operation of equipment due to circuit faults, thereby ensuring the safety of lines and equipment and improving the safe use performance of plastic circuit breakers.

[0019] 2. In the molded case circuit breaker tripping structure provided by the present invention, the electronic trip unit is limitedly installed in the first groove by a limit pressure plate. The limit pressure plate is composed of an upper baffle portion, a front baffle portion and a rear baffle portion connected together. The limit pressure plate arranged in this structure cooperates with the side wall of the first groove to form a limit interval that limits and surrounds the electronic trip unit, thereby limiting the installation of the electronic trip unit in the first groove, providing good installation stability, facilitating the installation and removal of the electronic trip unit, and improving installation efficiency.

[0020] 3. In the tripping structure of the molded case circuit breaker provided by the present invention, the rotating shaft is hinged to the lower connecting rod and the contact arm respectively through a crank arm structure, and specifically, the hinged cooperation is achieved through a pin structure. The advantage of such an installation design is that by removing the pin structure from between the crank arm structure and the contact arm, the connection between the rotating shaft and the moving contact can be disconnected. Similarly, by removing the pin structure between the crank arm structure and the lower connecting rod, the connection between the rotating shaft and the operating mechanism can be disconnected. In this way, the installation and disassembly between the rotating shaft, the operating mechanism and the moving contact can be quickly realized, and the installation structure between the operating mechanism, the rotating shaft and the moving contact is simplified, thereby achieving the effect of modularization and convenient installation between the operating mechanism, the rotating shaft and the moving contact, saving assembly time, improving assembly efficiency, reducing production costs, and facilitating mass production and assembly of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic cross-sectional view of the tripping structure of the molded case circuit breaker of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation structure of the operating mechanism, rotating shaft and moving contact of the utility model;

[0024] Figure 3 This is a schematic diagram of the installation structure of the electronic release of the utility model on the upper cover;

[0025] Figure 4 This is a top view of the upper cover of the utility model;

[0026] Figure 5 This is a structural diagram of the limiting pressure plate of the utility model.

[0027] Explanation of the accompanying symbols: 1. Shell; 11. Base; 12. Upper cover; 13. Cover; 14. Connection window; 15. First groove; 16. Second groove; 17. Lead hole; 18. Lead slot; 2. Electronic release; 21. Push rod structure; 3. Limit pressure plate; 31. Upper baffle part; 32. Rear baffle part; 33. Front baffle part; 4. Moving contact; 41. Contact arm; 5. Static contact; 6. Rotating shaft; 61. Crank arm structure; 62. Support plate; 7. Operating mechanism; 71. Mechanism bracket; 72. Lower connecting rod; 73. Tripping rod; 74. Tripping plate; 8. Controller; 10. Current transformer. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example

[0033] The present embodiment will be described in detail below with reference to the accompanying drawings:

[0034] This embodiment provides Figure 1-5 A molded case circuit breaker tripping structure is shown, comprising:

[0035] The housing 1 comprises a base 11, an upper cover 12 and a cover 13, wherein a receiving cavity is formed between the base 11 and the upper cover 12;

[0036] The operating mechanism 7 is detachably mounted on the top of the upper cover 12 and comprises a mechanism bracket 71 fixed to the upper cover 12 and a tripping rod 73 rotatably mounted on the mechanism bracket 71; a rotating shaft 6 detachably connected to the operating mechanism 7 is rotatably mounted on the top of the upper cover 12; and the operating mechanism 7 is characterized in that:

[0037] A first groove 15 is provided at the top of the upper cover 12, located below the operating mechanism 7. An electronic trip device 2 is provided in the first groove 15. The trip rod 73 has a trip portion extending to the first groove 15 and opposite to the electronic trip device 2. The electronic trip device 2 has a top rod structure 21 that moves toward the trip portion when triggered, so that the trip rod 73 is tripped and rotated when the trip portion is driven by the top rod structure 21.

[0038] The above embodiment is the core technical solution of this embodiment. The operating mechanism 7 and the rotating shaft 6 are independently and detachably mounted on the top of the upper cover 12, and the electronic trip 2 is mounted in the first groove 15 on the top of the upper cover 12. The trip rod 73 has a trip plate 74 that extends into the first groove 15 and cooperates with the electronic trip 2. This installation makes the electronic trip 2 just below the operating mechanism 7. By rationally utilizing the groove position space, the installation position requirement of the electronic trip 2 on the upper cover 12 is met without occupying the accommodating cavity space. At the same time, the installation height is reduced, and it can be well installed with the trip rod. The overall structure is more compact and easy to install and disassemble. It is also convenient, thereby realizing modular and convenient installation of the electronic trip unit at the position of the upper cover 12, improving installation efficiency. The electronic trip unit has high sensitivity and a relatively accurate action value. When a fault such as overload, loss of voltage, undervoltage or short circuit is detected in the load circuit, the controller of the molded case circuit breaker will control the action of the electronic trip unit, so that the electronic trip unit 2 drives the trip rod 73 to rotate through the top rod structure 21, thereby triggering the operating mechanism 7 to perform a tripping action to realize the tripping and opening of the circuit breaker, so as to avoid endangering the safety of the staff and the normal operation of the equipment due to circuit faults, thereby ensuring the safety of the lines and equipment and improving the safe use performance of the plastic circuit breaker.

[0039] As a preferred embodiment, the tripping portion includes a tripping plate 74 arranged on the tripping rod 73 and extending downward into the first groove 15. The tripping plate is located on the moving path of the top rod structure 21. The function of this tripping rod 73 is to trigger the operating mechanism 7 to perform a tripping and opening operation when it is driven to rotate by the electronic trip 2, so that the operating mechanism 7 switches from the closed state to the tripping and opening state, thereby realizing the tripping and opening of the circuit breaker.

[0040] The following combination Figure 1-5 The specific installation method of the electronic release 2 is described in detail:

[0041] A limiting pressure plate 3 is provided in the first groove 15 to form a limiting fit with the electronic release 2. As a specific structural setting, the limiting pressure plate 3 includes an upper baffle portion 31 that abuts against the opening of the first groove 15, and a front baffle portion 33 and a rear baffle portion 32 that are staggered on both sides of the upper baffle portion 31 and inserted into the first groove 15. One end of the rear baffle portion 32 is in an arc structure and cooperates to abut against the side wall of the electronic release 2, which is just adapted to the circular outer wall of the electronic release 2. The front baffle portion 33 cooperates to abut against the front end of the electronic release 2 and is provided with a push rod structure. 21 passes through the U-shaped opening, and the rear end of the electronic release 2 is limited by the side wall of the first groove 15. The two ends of the upper baffle portion 31 are fixed between the mechanism bracket and the top of the upper cover by fasteners. It can be seen that the limiting pressure plate 3 cooperates with the side wall of the first groove 15 to form a limiting interval that surrounds the electronic release 2, thereby playing a limiting installation role for the electronic release 2 in the first groove 15. Such installation can prevent the electronic release 2 from shaking and offsetting in position, has good installation stability, and is convenient for the installation and disassembly of the electronic release 2 at the position of the upper cover 12, thereby improving installation efficiency.

[0042] For further optimization, refer to Figure 2-3 A controller 8 located on one side of the operating mechanism 7 is installed on the top of the upper cover 12, and the electronic release 2 is electrically connected to the controller 8. It is further preferably provided that three groove structures are provided at intervals on the top of the upper cover 12, and the three groove structures respectively include a first groove 15 on which the electronic release 2 is installed and two second grooves 16 on both sides of the first groove 15. A lead groove 18 is provided between the first groove 15 and the two second grooves 16. The controller 8 is arranged above one of the second grooves 16, so that the connecting wire of the electronic release 2 extends through the lead groove 18 to the second groove 16 and is connected to the controller 8. The lead groove 18 facilitates the wiring between the electronic release 2 and the controller 8, and the wiring is neat and standardized, avoiding the situation where the wires are crushed when installing the controller 8 and the operating mechanism 7, and playing an installation protection role for the connecting wire of the electronic release 2. With this structural setting, when a circuit fault such as overload, loss of voltage, undervoltage or short circuit is detected, the controller 8 will control the electronic trip unit 2 to operate, so that the electronic trip unit 2 pushes the trip plate 74 through the top rod structure 21 to drive the trip rod 73 to rotate, thereby triggering the operating mechanism 7 to trip and open the circuit breaker, thereby driving the circuit breaker to trip quickly, avoiding circuit faults that endanger the safety of workers and the normal operation of equipment, thereby protecting the safe operation of the line and equipment.

[0043] In this embodiment, according to the preferred three-phase line system of the molded case circuit breaker, three interphase slots are correspondingly arranged between the base 11 and the upper cover 12, and also include three moving contacts 4, three static contacts 5 and three current transformers 10 respectively arranged in the three interphase slots, and three incoming conductive plates respectively connected to the three groups of static contacts 5 and three outgoing conductive plates respectively connected to the three moving contacts 4 are provided in the three interphase slots. The three outgoing conductive plates pass through the three current transformers 10 respectively, and the three groove structures are respectively provided with lead holes 17 connecting the three interphase slots, so that the detection circuits of the three transformer devices pass through the lead holes 17 to pass into the three groove structures, and extend through the lead grooves 18 to be connected to the controller 8, so that installation and wiring are convenient and the connection distance is shortened. The three current transformers 10 are used to respectively detect the current information of the three-phase main circuit, and the collected current information is sent to the controller 8, thereby realizing real-time current information collection and monitoring of the three-phase circuit of the molded case circuit breaker.

[0044] Combine Figure 1-3As shown, two opposing support plates 62 are provided on the side panels of the mechanism bracket 71; or two opposing support plates 62 are provided on the top of the upper cover 12. It can be seen that the two support plates 62 can be optionally installed on the top of the upper cover 12 or the mechanism bracket 71 to meet the installation requirements of the rotating shaft 6. The two support plates 62 are oppositely provided with two rotating shaft holes for the rotating shaft 6 to pass through. The rotating shaft 6 is rotatably passed through the two support plates 62 through the rotating shaft holes and is located between the mechanism bracket 71 and the upper cover 12. Such an installation design realizes the rotation setting of the rotating shaft 6 on the top of the upper cover 12. It is further preferred that the moving contact 4 has a contact arm 41 extending upward from the top of the upper cover 12, and the top of the upper cover 12 is provided with a connection window 14 for the contact arm 41 to pass through, and the connection window 14 is provided at the top of the upper cover 12 corresponding to three and respectively connected to the three interphase slots, the operating mechanism 7 includes a lower connecting rod 72 connected to the rotating shaft 6, and the rotating shaft 6 includes a plurality of crank arm structures 61 respectively connected to the lower connecting rod 72 and the contact arm 41, and the crank arm structure 61 is realized by a pin structure respectively connected to the lower connecting rod 72 and the contact arm 41. Hinged, therefore, during disassembly, as long as the pin structure is removed from between the crank arm structure 61 and the contact arm 41, the connection between the rotating shaft 6 and the moving contact 4 can be disconnected. Similarly, as long as the pin structure between the crank arm structure 61 and the lower connecting rod 72 is removed, the connection between the rotating shaft 6 and the operating mechanism 7 can also be disconnected. This type of rotating shaft 6 can meet the needs of relative movement between the two components and on-site installation through the pin hinge method, so that the rotating shaft 6 can quickly achieve a quick and detachable connection between the moving contact 4 and the operating mechanism 7, which is beneficial to improving assembly efficiency. The molded case circuit breaker using this technical solution achieves the effect of modularization and convenient installation between the operating mechanism 7, the rotating shaft 6 structure and the moving contact 4 through the reasonable optimization layout and design of the components such as the operating mechanism 7, the rotating shaft 6 structure and the moving contact 4, simplifies the installation structure, reduces the difficulty of installation, is very convenient for product disassembly and maintenance, saves assembly time, improves assembly efficiency, reduces production costs, and is beneficial to mass production and assembly of products.

[0045] As a preferred embodiment, the operating mechanism 7 includes a handle, a lever, an upper connecting rod, a lower connecting rod 72, a main tension spring, a trip buckle, a lock buckle, a re-fastener and a tripping rod 73. The lever, the trip buckle and the lock buckle are respectively rotatably arranged on the mechanism bracket 71. The handle is connected to the lever. One end of the upper connecting rod is rotatably arranged with the trip buckle. The lower connecting rod 72 is hinged to the upper connecting rod through a hinge shaft. The two ends of the main tension spring are respectively connected to the lever and the hinge shaft. The lock buckle and the trip buckle are kept in the closed state when the operating mechanism 7 is in the closed state. Locked, the operating structure is hingedly connected to the rotating shaft 6 structure through the lower connecting rod 72, so that the operating mechanism 7 controls the rotation of the rotating shaft 6, so that the rotating shaft 6 drives the moving contact 4 to contact or separate with the static contact 5, wherein the tripping rod 73 cooperates with the tripping latch, and when the operating mechanism 7 is in the closed state, once the tripping rod 73 is triggered to rotate, it will trigger the operating mechanism 7 to perform the tripping and opening operation, so that the operating mechanism switches from the closed state to the tripping and opening state, thereby realizing the tripping and opening of the circuit breaker.

[0046] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A molded case circuit breaker tripping structure, comprising: The housing (1) structure comprises a base (11), an upper cover (12) and a cover (13), wherein a receiving cavity is formed between the base (11) and the upper cover (12); An operating mechanism (7) is detachably mounted on the top of an upper cover (12), comprising a mechanism bracket (71) fixed to the upper cover (12) and a tripping rod (73) rotatably mounted on the mechanism bracket (71); a rotating shaft (6) detachably connected to the operating mechanism (7) is rotatably mounted on the top of the upper cover (12); and the operating mechanism (7) is characterized in that: The top of the upper cover (12) is provided with a first groove (15) located below the operating mechanism (7); an electronic tripping device (2) is provided in the first groove (15); the tripping rod (73) has a tripping portion extending to the first groove (15) and opposite to the electronic tripping device (2); the electronic tripping device (2) has a top rod structure (21) that moves toward the side of the tripping portion when triggered, so that the tripping rod (73) is tripped and rotated when the tripping portion is driven by the top rod structure (21).

2. The molded case circuit breaker tripping structure according to claim 1, characterized in that: The tripping portion comprises a tripping plate (74) arranged on the tripping rod (73) and extending downward into the first groove (15); the tripping plate is located on the moving path of the top rod structure (21).

3. The molded case circuit breaker tripping structure according to claim 2, characterized in that: A limiting pressure plate (3) is provided in the first groove (15) and forms a limiting cooperation with the electronic release (2); the limiting pressure plate (3) cooperates with the side wall of the first groove (15) to form a limiting interval for limiting the electronic release (2).

4. The molded case circuit breaker tripping structure according to claim 3, characterized in that: The limiting pressure plate (3) includes an upper baffle portion (31) that abuts against the opening of the first groove (15), and a front baffle portion (33) and a rear baffle portion (32) that are staggered and arranged on both sides of the upper baffle portion (31) and inserted into the first groove (15). One end of the rear baffle portion (32) is in an arc structure and cooperates to abut against the side wall of the electronic release (2). The front baffle portion (33) cooperates to abut against the front end of the electronic release (2) and is provided with a U-shaped opening for the top rod structure (21) to pass through.

5. The molded case circuit breaker tripping structure according to claim 4, characterized in that: Both ends of the upper baffle portion (31) are fixed between the mechanism bracket and the top of the upper cover.

6. The molded case circuit breaker tripping structure according to any one of claims 1 to 5, characterized in that: A controller (8) located on one side of the operating mechanism (7) is installed on the top of the upper cover (12), and the electronic trip unit (2) is electrically connected to the controller (8).

7. The molded case circuit breaker tripping structure according to claim 6, characterized in that: The top of the upper cover (12) is provided with three groove structures at intervals, and the three groove structures respectively include a first groove (15) on which the electronic release (2) is installed and two second grooves (16) respectively provided on both sides of the first groove (15); a lead groove (18) is provided between the first groove (15) and the two second grooves (16); the controller (8) is provided above one of the second grooves (16), so that the connection line of the electronic release (2) extends through the lead groove (18) to the second groove (16) and is connected to the controller (8).

8. The molded case circuit breaker tripping structure according to claim 6, characterized in that: Three interphase slots are provided between the base (11) and the upper cover (12), and the base also includes three moving contacts (4), three static contacts (5) and three current transformers (10) respectively provided in the three interphase slots. The three slot structures are respectively provided with lead holes (17) connected to the three interphase slots, so that the detection circuits of the three transformer devices pass through the lead holes (17) into the three slot structures and extend to be connected to the controller (8) through the lead slots (18).

9. The molded case circuit breaker tripping structure according to claim 8, characterized in that: The movable contact (4) has a contact arm (41) extending upward from the top of the upper cover (12); a connection window (14) is provided on the top of the upper cover (12) for the contact arm (41) to pass through; the operating mechanism (7) includes a lower connecting rod (72) connected to the rotating shaft (6); and the rotating shaft (6) includes a crank arm structure (61) hingedly connected to the lower connecting rod (72) and the contact arm (41), respectively.

10. The molded case circuit breaker tripping structure according to claim 9, characterized in that: Two opposing support plates (62) are provided on the side plates on both sides of the mechanism bracket (71); or two opposing support plates (62) are provided on the top of the upper cover (12), and the two support plates (62) are oppositely provided with two rotating shaft holes for the rotating shaft (6) to pass through, and the rotating shaft (6) is rotatably passed through the two support plates (62) through the rotating shaft holes and is located between the mechanism bracket (71) and the upper cover (12).

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