Release and circuit breaker

Abstract

The release comprises a thermal element, an iron core and an armature, the iron core and the armature are of two half-frame structures of which the open ends are oppositely arranged, the open end of the armature is rotationally arranged at the open end of the iron core, so that a through cavity for the heat element to penetrate through is defined between the armature and the iron core, and the part, penetrating into the through cavity, of the thermal element is riveted with the iron core; the closed end, opposite to the open end, of the armature is provided with a first pull-in part, and the open end of the iron core is provided with a second pull-in part opposite to the first pull-in part in a spaced mode. The circuit breaker comprises a base, an operating mechanism, a draw bar, a contact mechanism and a release. According to the tripper and the circuit breaker, the armature and the iron core of the tripper are designed into the semi-frame structures, the open end of the armature is directly and rotatably arranged at the open end of the iron core, and the closed end of the armature and the open end of the iron core are attracted and matched, so that the structure is simplified, the layout is compact, the iron core and the armature form a magnetic loop, and the armature is supported; therefore, a support is omitted, and the structure and the assembly process are simpler.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a release and a circuit breaker. Background Art

[0002] The release is one of the very important structural parts of a molded case circuit breaker. When a fault current occurs in the main circuit, the electromagnetic release drives the traction rod to rotate, and the traction rod triggers the release of the latch of the operating mechanism of the circuit breaker. The operating mechanism acts to cut off the main circuit, thus playing a role in fault protection. At present, the electromagnetic release generally consists of five parts: a bracket, an iron core, an armature, a shaft, and a reaction spring. The armature is installed on the bracket through the shaft and forms a magnetic circuit with the iron core. The release has defects such as complex structure, inconvenient installation, and high production cost. In addition, the release also has the defect of poor compatibility. For example, electronic circuit breakers often adopt different release structures because they do not have bimetals and molded case circuit breakers. Summary of the Invention

[0003] The purpose of the utility model is to overcome at least one defect of the prior art and provide a release and a circuit breaker.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The release includes a thermal element, an iron core, and an armature. The iron core and the armature are two semi-frame structures with their open ends facing each other. The open end of the armature is rotatably arranged on the open end of the iron core, so that a through cavity for the thermal element to pass through is formed between the armature and the iron core. The part of the thermal element penetrating into the through cavity is riveted to the iron core together; a first suction part is arranged at the closed end of the armature opposite to the open end, and a second suction part spaced opposite to the first suction part is arranged at the open end of the iron core.

[0006] Optionally, the iron core includes a fixing plate and two mounting arms serving as the open end of the iron core. The fixing plate serves as the closed end of the iron core opposite to the open end. The two mounting arms are connected to both sides of the fixing plate. The armature includes a connecting plate serving as the closed end of the armature and two rotating arms serving as the open end of the armature. The two rotating arms are connected to both sides of the connecting plate. The rotating arms on the same side are stacked with the mounting arms.

[0007] Optionally, the two mounting arms extend towards the approaching direction to form two positioning arms corresponding to the two rotating arms. When the armature and the iron core are in a repulsive state, the end of the rotating arm far from the connecting plate abuts against the positioning arm.

[0008] Optionally, the open end of the armature is rotatably arranged on the open end of the iron core through a rotating shaft. A first rotating shaft hole matched with the rotating shaft is arranged on the open end of the armature, and a second rotating shaft hole matched with the rotating shaft is arranged on the open end of the iron core.

[0009] Optionally, it further includes a return spring for providing an elastic return force to the armature. The return spring has a fixed end connected to the iron core and a movable end connected to the armature. A plurality of limiting grooves are provided on the iron core for limiting connection with the fixed end of the return spring.

[0010] Optionally, the return spring includes two spring bodies sleeved on the rotating shaft of the armature and located inside the open end of the armature. The two spring bodies are arranged at intervals. The ends of the two spring bodies away from each other extend outward respectively to form two fixed ends on the same side of the spring bodies. The ends of the two spring bodies close to each other are connected to form the movable end; the plurality of limiting grooves are arranged at intervals along the axial direction of the rotating shaft.

[0011] Optionally, a side edge of the closed end of the armature extends outward in the direction of the rotation axis of the armature to form the first engaging portion, and the second engaging portion is an inclined surface provided on the end face of the open end of the iron core.

[0012] Optionally, an impact rod is provided on the open end of the armature. The impact rod and the first engaging portion are located on both sides of the rotation axis of the armature, and the impact rod is located on the same side of the armature and the iron core.

[0013] Optionally, it further includes a bimetallic strip. The parts of the heating element and the bimetallic strip penetrating into the through cavity are riveted together with the iron core.

[0014] Optionally, the heating element has a raised portion. One side of the raised portion bulges in the thickness direction of the heating element, and the other side forms a recessed opening. The closed end of the iron core opposite to the open end is located in the recessed opening of the raised portion and is stacked with one side of the raised portion and the bimetallic strip in sequence.

[0015] A circuit breaker includes a base, an operating mechanism provided on the base, a traction rod, and a contact mechanism. The contact mechanism includes a movable contact and a static contact that cooperate with each other. The operating mechanism is connected to the movable contact of the contact mechanism and can drive the movable contact to swing to disconnect or close with the static contact. The circuit breaker further includes a release as described in any one of the above. The heating element of the release is a wiring board for directly connecting an external conductor, and the heating element is electrically connected to the movable contact of the contact mechanism; when a short-circuit fault occurs in the circuit breaker, the armature of the release cooperates with the traction rod to drive the operating mechanism to trip.

[0016] Optionally, when an overload fault occurs in the circuit breaker, the bimetallic strip of the release cooperates with the traction rod to drive the operating mechanism to trip.

[0017] Optionally, it further includes a measuring current transformer and a protection current transformer. One end of the heating element passes through the protection current transformer, the measuring current transformer, and the through cavity of the release in sequence and is electrically connected to the movable contact.

[0018] The release and circuit breaker of the present utility model. The armature and iron core of the release are designed in a semi-frame structure. The open end of the armature is directly rotatably arranged at the open end of the iron core, and the closed end of the armature is in suction fit with the open end of the iron core. The thermal element is riveted to the iron core together, simplifying the structure and making the layout compact. The iron core not only forms a magnetic circuit with the armature but also plays a role in supporting the armature, thus saving the bracket. The structure and assembly process are simpler and more material-saving.

[0019] In addition, the release is equipped with a bimetal sheet that passes through the cavity formed by the armature and the iron core and is riveted to the thermal element. Through component differentiation, it can be compatible with circuit breakers of different structures such as thermal-magnetic type, electronic type, and measurement type.

[0020] In addition, the iron core and the armature are designed in a U-shaped semi-frame structure, which is simple in structure and convenient for assembly and manufacturing. In addition, the rotating arm cooperates with the positioning arm to play a role in installing and positioning the armature, facilitating installation.

[0021] In addition, different force value fine-tuning is achieved by hanging the fixed end of the reset spring in different limit slots of the iron core, increasing the tolerance of the spring force value and improving the qualification rate of instantaneous short-circuit protection.

[0022] In addition, the thermal element, as a wiring board directly connecting external conductors, passes through the protection transformer and the measurement transformer at the same time, enabling differential assembly of the transformers and realizing mutual compatibility of different circuit breakers such as measurement type, electronic type, and molded case circuit breakers, with a wide range of applications. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the base, operating mechanism, contact mechanism, release, and transformer of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the base, operating mechanism, contact mechanism, and release of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the release of the present utility model;

[0026] Figure 4 is a schematic structural diagram of the armature of the present utility model;

[0027] Figure 5 is a schematic structural diagram of the iron core of the present utility model;

[0028] Figure 6 is a schematic structural diagram of the reset spring of the present utility model.

[0029] Base 1; heating element 2; bulge 21; recessed opening 22; operating mechanism 3; towing rod 4; release 5; through cavity 50; iron core 51; second attracting portion 511; fixing plate 512; mounting arm 513; positioning arm 514; second rotating shaft hole 515; limiting groove 516; bimetal 52; rotating shaft 53; return spring 54; spring body 541; fixed end 542; movable end 543; armature 55; first attracting portion 551; connecting plate 552; rotating arm 553; first rotating shaft hole 554; impact rod 555; contact mechanism 6; measuring mutual inductor 7; protection mutual inductor 8. Detailed implementation manner

[0030] The following embodiments given in conjunction with the drawings further illustrate the detailed implementation manners of the release and the circuit breaker of the present utility model. The release and the circuit breaker of the present utility model are not limited to the descriptions of the following embodiments.

[0031] As Figure 1 and Figure 2 shown, the circuit breaker of this embodiment includes a base 1, an operating mechanism 3, a towing rod 4, and a contact mechanism 6 provided on the base 1. The contact mechanism 6 includes a movable contact and a static contact that cooperate with each other. The operating mechanism 3 is connected to the movable contact of the contact mechanism 6 and can drive the movable contact to swing to disconnect or close with the static contact, realizing the opening or closing of the circuit breaker. The circuit breaker further includes a release 5, and the release includes a heating element 2, a bimetal 52, an iron core 51, and an armature 55. The heating element 2 of the release 5 is electrically connected to the movable contact of the contact mechanism 6; when a short-circuit fault occurs in the circuit breaker, the armature 55 of the release 5 cooperates with the towing rod 4 to drive the operating mechanism 3 to trip, causing the circuit breaker to trip and realizing short-circuit protection; when an overload fault occurs in the circuit breaker, the bimetal 52 of the release 5 cooperates with the towing rod 4 to drive the operating mechanism 3 to trip, causing the circuit breaker to trip and realizing overload protection. The release 5 and the contact mechanism 6 of this embodiment are correspondingly arranged, and one or more can be set. The towing rod 4 is horizontally arranged above the release 5.

[0032] The operating mechanism 3 of this embodiment is a prior art, generally including a bracket, a handle, a rocker arm, a energy storage spring, a connecting rod, a crank, a latch and a trip latch connected by a buckle. The bracket is installed on the base 1, the rocker arm is rotatably installed on the bracket, the trip latch, the latch and the traction rod 4 are respectively rotatably arranged on the bracket. The latch is connected with the trip latch by a buckle, the traction rod 4 is connected with the latch in a limiting way. The crank is rotatably installed on the trip latch through a crankshaft. One end of the connecting rod is rotatably connected with the crank through a spring shaft, and the other end is directly or indirectly connected with the moving contact of the contact mechanism 6, and is used for driving the moving contact of the contact mechanism 6 to rotate. One end of the energy storage spring is connected with the rocker arm, and the other end is connected with the spring shaft at the connection of the connecting rod and the crank. The rocker arm, the crank, the latch, the trip latch, the connecting rod and the energy storage spring constitute the link structure of the operating mechanism. The latch and the trip latch connected by a buckle limit the rotation position of the crank so that the crank can rotate around the trip latch as the rotation center. When the circuit breaker is in a normal state, the handle drives the rocker arm to swing, the rocker arm drives the crank and the connecting rod to rotate, and then the connecting rod drives the moving contact of the contact mechanism 6 to rotate to be closed and disconnected from the static contact, realizing the closing and opening of the circuit breaker. When a short circuit or overload fault occurs in the circuit breaker, the armature 55 or the bimetallic strip 52 of the release 5 drives the traction rod 4, so that the traction rod 4 is disengaged from the limiting cooperation with the latch, the latch is disengaged from the buckle cooperation with the trip latch, and the operating mechanism 3 trips.

[0033] An improvement point of this application is that, as Figures 3 - 5As shown, the iron core 51 and the armature 55 of the release 5 are two semi-frame structures with their open ends facing each other. The open end of the armature 55 is rotatably arranged on the open end of the iron core 51, so that a through cavity 50 for the heating element 2 and the bimetal 52 to pass through is formed between the armature 55 and the iron core 51. The parts of the heating element 2 and the bimetal 52 that penetrate into the through cavity 50 are riveted together with the iron core 51. A first attracting portion 551 is provided at the closed end of the armature 55 opposite to the open end, and a second attracting portion 511 spaced opposite to the first attracting portion 551 is provided at the open end of the iron core 51. For the release and the circuit breaker of this embodiment, the armature 55 and the iron core 51 of the release are designed as semi-frame structures. The open end of the armature 55 is directly rotatably arranged on the open end of the iron core 51, and the closed end of the armature 55 is in attracting cooperation with the open end of the iron core 51. The heating element is riveted to the iron core, which simplifies the structure and makes the layout compact. The iron core 51 not only forms a magnetic circuit with the armature 55 but also plays a role in supporting the armature 55, thus saving the bracket. The structure and the assembly process are simpler and more material-saving. In addition, the release is equipped with a bimetal 52 that passes through the through cavity 50 formed by the armature 55 and the iron core 51 and is riveted to the heating element 2. Through component differentiation, circuit breakers with different structures such as thermal-magnetic type, electronic type, and measurement type can be compatible. When the release of this embodiment is applied to a thermal-magnetic circuit breaker, it has both short-circuit protection and overload protection functions; when applied to an electronic circuit breaker and a measurement circuit breaker, only the bimetal 52 needs to be removed, and it does not have overload protection function but only has short-circuit protection function.

[0034] As Figures 3 - 5As shown in the figure, the rotational mounting structure between the iron core 51 and the armature 55 in this embodiment. The iron core 51 includes a fixing plate 512 and two mounting arms 513 which are the open ends of the iron core 51. The fixing plate 512 serves as the closed end of the iron core 51 opposite to the open end. The two mounting arms 513 are connected to both sides of the fixing plate 512. The two mounting arms 513 are preferably perpendicularly connected to both sides of the fixing plate 512. Of course, the mounting arms 513 and the fixing plate 512 can also be connected at other angles. The armature 55 includes a connecting plate 552 which is the closed end of the armature 55 and two rotating arms 553 which are the open ends of the armature 55. The two rotating arms 553 are connected to both sides of the connecting plate 552. The rotating arms 553 on the same side are stacked with the mounting arms 513. The two rotating arms 553 are preferably arranged between the two mounting arms 513. Of course, they can also be arranged outside the two mounting arms 513. The iron core 51 and the armature 55 are designed to be similar to a U-shaped half-frame structure, with a simple structure and being convenient for assembly, production and manufacturing. The two rotating arms 553 are preferably perpendicularly connected to both sides of the connecting plate 552. Of course, the rotating arms 553 and the connecting plate 552 can also be connected at other angles. Specifically, the open end of the armature 55 (i.e., the rotating arms 553) is rotatably arranged inside the open end of the iron core 51 (i.e., between the two mounting arms 513) through a rotating shaft 53. The open end of the armature 55 (i.e., the rotating arms 553) is provided with a first rotating shaft hole 554 that cooperates with the rotating shaft 53, and the open end of the iron core 51 (i.e., the mounting arms 513) is provided with a second rotating shaft hole 515 that cooperates with the rotating shaft 53.

[0035] Furthermore, the two mounting arms 513 extend towards the approaching direction to form two positioning arms 514 corresponding to the two rotating arms 553. When the armature 55 and the iron core 51 are in a repulsive state, the end of the rotating arm 553 away from the connecting plate 552 abuts against the positioning arm 514. The cooperation between the rotating arm 553 and the positioning arm 514 plays a role in installing and positioning the armature 55, which is convenient for installation. It should be noted that when the circuit breaker is in a normal opening and closing state, the armature 55 and the iron core 51 are in a repulsive state, that is, the first attracting part 551 of the armature 55 and the second attracting part 511 of the iron core 51 are spaced opposite to each other; when a short-circuit fault occurs in the circuit breaker, the armature 55 rotates, causing the first attracting part 551 of the armature 55 to be attracted to the second attracting part 511 of the iron core 51.

[0036] As Figure 3 and Figure 6As shown in the figure, the release of this embodiment further includes a return spring 54 for providing an elastic return force to the armature 55. The return spring 54 has a fixed end 542 connected to the iron core 51 and a movable end 543 connected to the armature 55. A plurality of limiting grooves 516 are provided on the iron core 51 for limiting connection with the fixed end 542 of the return spring 54. By hanging the fixed end 542 of the return spring 54 in different limiting grooves 516 of the iron core 51, fine adjustment of different force values is realized, the tolerance of the spring force value is increased, and the qualification rate of instantaneous short-circuit protection is improved.

[0037] Specifically, the return spring 54 includes two spring bodies 541 sleeved on the rotating shaft 53 of the armature 55 and located inside the open end of the armature 55. The two spring bodies 541 are arranged at intervals. The ends of the two spring bodies 541 away from each other extend outward respectively to form two fixed ends 542 on the same side of the spring bodies 541. The ends of the two spring bodies 541 close to each other are connected to form the movable end 543; a plurality of limiting grooves 516 are arranged at intervals along the axial direction of the rotating shaft 53. The fixed end 542 is preferably L-shaped, and the limiting groove 516 of the iron core 51 is preferably arranged on the side of the positioning arm 514 facing away from the spring body 541, so that the positioning arm 514 is located inside the opening of the L-shaped fixed end 542, and the fixed end 542 of the return spring 54 can be stably installed; the movable end 543 is preferably U-shaped, and the movable end 543 abuts against the connecting plate 552 of the armature 55.

[0038] As Figures 3 - 5 shown in the figure, the attracting structure between the armature 55 and the iron core 51 of this embodiment. The side edge of the closed end (i.e., the connecting plate 552 mounting arm 513) of the armature 55 extends outward along the rotation axis direction of the armature 55 to form the first attracting portion 551. The second attracting portion 511 of the iron core 51 is an inclined surface provided on the end surface of the open end (i.e., the mounting arm 513) of the iron core 51. The rotation axis of the armature 55 refers to the central axis of the rotating shaft 53.

[0039] As Figure 3 and Figure 4 shown in the figure, the structure of the armature 55 for driving the drawbar 4 in this embodiment. An impact rod 555 for driving the release of the operating mechanism 3 is provided on the open end of the armature 55. The impact rod 555 and the first attracting portion 551 are located on both sides of the rotation axis of the armature 55, and the impact rod 555 is located on the same side of the armature 55 and the iron core 51.

[0040] As Figure 3As shown, the riveting structure of the iron core 51, the thermal element 2, and the bimetal 52 in this embodiment. The thermal element 2 has a raised portion 21. One side of the raised portion 21 bulges in the thickness direction of the thermal element 2, and the other side forms a recessed opening 22. The closed end (i.e., the fixing plate 512) of the iron core 51 opposite to the open end is located in the recessed opening 22 of the raised portion 21, and is stacked in sequence with one side of the raised portion 21 and the bimetal 52.

[0041] As Figure 1 As shown, another improvement point of this application is that the circuit breaker in this embodiment further includes a measuring current transformer 7 and a protection current transformer 8. The thermal element 2 is also a wiring board for the circuit breaker to directly connect to an external conductor. One end of the thermal element 2 sequentially passes through the through cavity 50 of the protection current transformer 8, the measuring current transformer 7, and the release 5 and is electrically connected to the moving contact of the contact mechanism. The thermal element 2, as a wiring board, passes through the protection current transformer 8 and the measuring current transformer 7 at the same time, enabling differential assembly of the current transformers, realizing mutual compatibility of different circuit breakers such as measuring, electronic, and molded case circuit breakers, and having a wide range of applications.

[0042] It should be noted that the contact mechanism 6 in this embodiment is a prior art, and usually further includes a contact support, a contact rotating shaft, and a contact bracket. The moving contact is rotatably installed on the contact support through the contact rotating shaft. The contact bracket is coaxially arranged with the moving contact and is rotatably connected to the moving contact. That is, when the moving contact rotates, the contact bracket remains stationary and is in contact connection with the moving contact. One end of the thermal element 2 is fixed to the contact bracket by screws, thereby realizing the electrical connection between the thermal element 2 and the moving contact.

[0043] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when in use and commonly placed. It is only for the convenience of description and does not indicate that the indicated device or element must have a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0044] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A release device, comprising a thermal element (2), an iron core (51) and an armature (55), characterized in that: The iron core (51) and the armature (55) are two half-frame structures with open ends arranged opposite to each other. The open end of the armature (55) is rotatably arranged on the open end of the iron core (51), so that a through cavity (50) for the heating element (2) to pass through is formed between the armature (55) and the iron core (51), and the portion of the heating element (2) that penetrates into the through cavity (50) is riveted together with the iron core (51); the closed end of the armature (55) opposite to the open end is provided with a first suction portion (551), and the open end of the iron core (51) is provided with a second suction portion (511) spaced opposite to the first suction portion (551).

2. The release according to claim 1, characterized in that: The iron core (51) comprises a fixed plate (512) and two mounting arms (513) serving as the open end of the iron core (51); the fixed plate (512) serves as the closed end of the iron core (51) opposite to the open end; the two mounting arms (513) are connected to two sides of the fixed plate (512); the armature (55) comprises a connecting plate (552) serving as the closed end of the armature (55) and two rotating arms (553) serving as the open end of the armature (55); the two rotating arms (553) are connected to two sides of the connecting plate (552); the rotating arms (553) and the mounting arms (513) on the same side are stacked.

3. The release according to claim 2, characterized in that: The two mounting arms (513) extend in a direction approaching each other to form two positioning arms (514) corresponding to the two rotating arms (553); when the armature (55) and the iron core (51) are in a repelling state, one end of the rotating arm (553) away from the connecting plate (552) abuts against the positioning arm (514).

4. The release according to claim 1 or 2, characterized in that: The open end of the armature (55) is rotatably arranged on the open end of the iron core (51) via a rotating shaft (53); a first rotating shaft hole (554) matching with the rotating shaft (53) is provided on the open end of the armature (55); and a second rotating shaft hole (515) matching with the rotating shaft (53) is provided on the open end of the iron core (51).

5. The release according to claim 1, characterized in that: The invention also comprises a return spring (54) for providing an elastic return force for the armature (55), wherein the return spring (54) comprises a fixed end (542) connected to the iron core (51) and a movable end (543) connected to the armature (55), and the iron core (51) is provided with a plurality of limit grooves (516) for being connected to the fixed end (542) of the return spring (54) in a limit position.

6. The release according to claim 5, characterized in that: The return spring (54) comprises two spring bodies (541) which are sleeved on the rotating shaft (53) of the armature (55) and located in the open end of the armature (55); the two spring bodies (541) are arranged at intervals; the ends of the two spring bodies (541) which are far away from each other respectively extend outwards to form two fixed ends (542) located on the same side of the spring bodies (541); the other ends of the two spring bodies (541) which are close to each other are connected to form the movable end (543); and a plurality of limit grooves (516) are arranged at intervals along the axial direction of the rotating shaft (53).

7. The release according to claim 1, characterized in that: The closed end side edge of the armature (55) extends outwardly along the rotation axis direction of the armature (55) to form the first suction portion (551), and the second suction portion (511) is an inclined surface arranged on the open end surface of the iron core (51).

8. The release according to claim 1, characterized in that: An impact rod (555) is provided on the open end of the armature (55), the impact rod (555) and the first suction portion (551) are located on both sides of the rotation axis of the armature (55), and the impact rod (555) is located on the same side of the armature (55) and the iron core (51).

9. The release according to claim 1, characterized in that: It also comprises a bimetallic strip (52), and the portion of the thermal element (2) and the bimetallic strip (52) that penetrates into the through cavity (50) is riveted together with the iron core (51).

10. The release according to claim 9, characterized in that: The thermal element (2) has a raised portion (21), one side of the raised portion (21) in the thickness direction of the thermal element (2) is raised, and the other side forms a recessed opening (22); the closed end of the iron core (51) opposite to the open end is located in the recessed opening (22) of the raised portion (21), and is stacked in sequence with one side of the raised portion (21) and the bimetallic strip (52).

11. A circuit breaker, comprising a base (1), an operating mechanism (3) arranged on the base (1), a traction rod (4) and a contact mechanism (6), wherein the contact mechanism (6) comprises a moving contact and a stationary contact that match each other, and the operating mechanism (3) is connected to the moving contact of the contact mechanism (6) and can drive the moving contact to swing and disconnect or close with the stationary contact, characterized in that: The circuit breaker further comprises a release (5) as claimed in any one of claims 1 to 10, wherein the thermal element (2) of the release (5) is a terminal block for directly connecting an external conductor, and the thermal element (2) is electrically connected to a moving contact of a contact mechanism (6); when a short circuit fault occurs in the circuit breaker, the armature (55) of the release (5) cooperates with the traction rod (4) to drive the operating mechanism (3) to trip.

12. The circuit breaker according to claim 11, characterized in that: When an overload fault occurs in the circuit breaker, the bimetallic strip (52) of the tripper (5) cooperates with the traction rod (4) to drive the operating mechanism (3) to trip.

13. The circuit breaker according to claim 11, characterized in that: It also includes a measuring transformer (7) and a protection transformer (8), and one end of the thermal element (2) passes through the protection transformer (8), the measuring transformer (7), and the through cavity (50) of the release (5) in sequence and is then electrically connected to the moving contact.

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