Miniature circuit breakers

Abstract

A miniature circuit breaker includes a housing and a handle. An overload protection device and an operating mechanism connected to a moving contact are disposed within the housing. The overload protection device includes a temperature control assembly having a bimetallic strip. A line terminal connected to the moving contact is disposed within the housing near the moving contact. A stationary contact is disposed on one side of the moving contact and engages with the moving contact. A temperature control assembly is disposed on the other side of the moving contact. When an overload occurs, the temperature control assembly drives the temperature control protection device disposed within the housing to trigger the circuit breaker to trip. The temperature control protection device includes a partition and a thermal trip rod, the partition separating the moving contact and the thermal trip rod in two different planes. The temperature control assembly includes a bimetallic strip and a current-carrying conductor. When the circuit breaker is overloaded, the movable end of the bimetallic strip drives the thermal trip rod to rotate, triggering the circuit breaker to trip. The present invention shortens the current-carrying conductor of the temperature control assembly, reduces internal resistance, and reduces heat generation, thereby preventing component damage caused by excessive heating of the temperature control assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and in particular to a miniature circuit breaker. Background Art

[0002] The time-delay verification characteristics of overload protection devices in low-voltage terminal miniature circuit breakers for rated currents of 100A and above are difficult to control, primarily due to the inability to effectively balance the time-delay verification and temperature rise. Currently, the most common method used in circuit breakers is to shunt the overload protection device, reducing the heat generated by the bimetallic element and thus the impact on the circuit breaker's temperature rise. However, the most significant impact of current shunting on the overload protection device is that the short-delay verification time is long and discrete, significantly reducing production efficiency and product qualification rates. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a small circuit breaker with simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A miniature circuit breaker includes a housing and a handle disposed on the housing. An overload protection device and an operating mechanism connected to a moving contact are disposed within the housing. The overload protection device includes a temperature control assembly having a bimetallic strip. An incoming line terminal connected to the moving contact is disposed on one side of the housing near the moving contact. A stationary contact cooperating with the moving contact is disposed on one side of the moving contact. A temperature control assembly is disposed on the other side of the moving contact. The overload protection device also includes a temperature control protection device. When overloaded, the temperature control assembly drives the temperature control protection device disposed within the housing. Triggering the circuit breaker to trip; the temperature control protection device includes a partition and a thermal trip rod, the thermal trip rod can rotate on the partition to trigger the circuit breaker to trip, and the partition separates the moving contact and the thermal trip rod in two different planes; the temperature control component includes a bimetallic strip and a current-carrying conductor, the fixed end of the bimetallic strip is located on the shell on the side close to the moving contact, and the bimetallic strip is connected to the incoming line terminal through the current-carrying conductor. When the circuit breaker is overloaded, the bimetallic strip is bent by heat, so that the movable end of the bimetallic strip drives the thermal trip rod to rotate, triggering the circuit breaker to trip and disconnect.

[0006] Furthermore, the temperature control assembly also includes a bracket for fixing the bimetallic strip and the current-carrying conductor, one end of the bracket is connected to the fixed end of the bimetallic strip, the other end of the bracket forms a forked structure with the movable end of the bimetallic strip, and the other end of the bracket is used to connect to the adjustment member arranged on one side of the shell.

[0007] Furthermore, the partition is provided with a first critical point, a second critical point and a limiting portion, the first critical point and the second critical point are used to cooperate with the thermal trip rod in a limiting manner, the middle part of the thermal trip rod is rotatably mounted on the partition, one end of the thermal trip rod serves as an unlocking end and passes through the gap between the first critical point and the second critical point to cooperate with the operating mechanism, and the other end of the thermal trip rod serves as a driving end and cooperates with the movable end of the bimetallic strip; the limiting portion is used to cooperate with the bimetallic strip in a limiting manner.

[0008] Furthermore, the partition is in the shape of a right triangle as a whole, and a core shaft for rotatably installing the thermal trip rod is provided on the upper part of the partition, and two protrusions are provided on the side of the core shaft close to the operating mechanism as the first critical point and the second critical point respectively. The first critical point is located on the side close to the temperature control component, and the second critical point is located on the side away from the temperature control component; a longitudinal rib is provided on the partition, and a groove as a limiting part is provided in the middle of the rib, and the movable end of the bimetallic strip passes through the groove to cooperate with the driving end of the thermal trip rod.

[0009] Furthermore, the current-carrying conductor includes a current-carrying plate, a first soft conductor and a second soft conductor, one end of the current-carrying plate is connected to the incoming terminal, the other end of the current-carrying plate is connected to the second soft conductor, the first soft conductor is connected to the moving contact, the first soft conductor is connected to the second soft conductor, one end of the first soft conductor is connected to the bimetallic strip, and the other end of the first soft conductor is connected to the moving contact.

[0010] Furthermore, the middle part of the thermal trip rod is circular and is used to be rotatably connected to the partition. One end of the thermal trip rod serves as a driving end for cooperating with the movable end of the bimetallic strip, and the end of the driving end is blunt-round; the other end of the thermal trip rod serves as an unlocking end, and its end is bent to one side to trigger the circuit breaker to trip.

[0011] Furthermore, the partition as a whole is a right triangle, the thermal trip rod is rotatably installed on the upper part of the partition, one end of the thermal trip rod serves as an unlocking end extending out of the partition to cooperate with the operating mechanism, and the other end of the thermal trip rod serves as a driving end and is located in the middle of the partition; the temperature control component includes a bimetallic strip, a current-carrying conductor and a bracket, the bracket is used to fix the current-carrying conductor and the bimetallic strip between the incoming terminal and the moving contact, the movable end of the bimetallic strip extends to the driving end on the partition for driving the thermal trip rod, the bracket is inclined along the hypotenuse edge of the partition for connecting to the adjustment member on one side of the shell, and the adjustment member is inclined toward the hypotenuse of the partition.

[0012] Furthermore, the operating mechanism includes a contact support and a jumper and a lock buckle pivotally arranged on the contact support, the contact support is connected to the moving contact, one end of the jumper and the lock buckle are snap-connected to each other, the other end of the jumper is provided with a connecting rod for connecting to the handle, and the other end of the lock buckle is provided with an unlocking part that cooperates with the thermal trip rod.

[0013] Furthermore, the unlocking portion is located on one side edge of the lock close to the incoming terminal, and the unlocking portion is a raised structure protruding from the edge of the lock; the current-carrying conductor is also provided with an arc-starting plate for introducing the arc into the arc extinguishing chamber, and the arc-starting plate and the moving contact are located in the same plane.

[0014] Furthermore, an arc extinguishing chamber is provided in the housing, the arc extinguishing chamber is located on the side of the moving contact away from the temperature control component and below the static contact, and the partition is located on the side of the arc extinguishing chamber close to the moving contact.

[0015] Compared with existing solutions, a miniature circuit breaker of the present invention does not require current diversion for the temperature control component. By simply adding a partition in the housing, the moving contact and the thermal trip rod are respectively arranged in two different planes. The bimetallic strip, which was originally in the same plane as the moving contact, is also separated by the partition and is in a different plane from the moving contact. In addition, the temperature control component is installed in a space close to the moving contact, which shortens the current-carrying conductor length of the temperature control component, reduces internal resistance and heat generation, and avoids component damage caused by excessive heating of the temperature control component.

[0016] In addition, by setting a first critical point, a second critical point and a limit portion on the partition, the circuit breaker will not be interfered with by the thermal trip rod during normal operation under the restrictions of the first critical point and the second critical point. The limit portion is used to limit the range of movement of the bimetallic strip to avoid interference with the normal operation of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1-3 This is a structural schematic diagram of a miniature circuit breaker of the present invention;

[0018] Figure 4 yes Figure 2 Schematic diagram of the decomposition;

[0019] Figure 5 This is a schematic structural diagram of a temperature control component in a miniature circuit breaker of the present invention;

[0020] Figure 6 This is a structural diagram of a partition in a miniature circuit breaker of the present invention;

[0021] Figure 7 It is a structural schematic diagram of a current-carrying conductor in a miniature circuit breaker of the present invention. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 7 The following embodiments are provided to further illustrate the specific implementation of a miniature circuit breaker of the present invention. The miniature circuit breaker of the present invention is not limited to the description of the following embodiments.

[0023] A miniature circuit breaker includes a housing 1 and a handle 2 disposed on the housing 1. An overload protection device and an operating mechanism connected to a moving contact 8 are disposed within the housing 1. The overload protection device includes a temperature control assembly having a bimetallic strip 61. An incoming line terminal connected to the moving contact 8 is disposed on one side of the housing 1 near the moving contact 8. A stationary contact cooperating with the moving contact 8 is disposed on one side of the moving contact 8. The temperature control assembly is disposed on the other side of the moving contact 8. The overload protection device also includes a temperature control protection device. When overloaded, the temperature control assembly drives the temperature control protection device disposed within the housing 1 to trigger the circuit breaker to trip. ; The temperature control protection device includes a partition 41 and a thermal trip rod 42. The thermal trip rod 42 can rotate on the partition 41 to trigger the circuit breaker to trip. The partition 41 separates the moving contact 8 and the thermal trip rod 42 in two different planes; the temperature control component includes a bimetallic strip 61 and a current-carrying conductor. The fixed end of the bimetallic strip 61 is located on the housing 1 on the side close to the moving contact 8. The bimetallic strip 61 is connected to the incoming line terminal through the current-carrying conductor. When the circuit breaker is overloaded, the bimetallic strip 61 is bent by heat, so that the movable end 611 of the bimetallic strip 61 drives the thermal trip rod 42 to rotate, triggering the circuit breaker to trip and disconnect.

[0024] Compared with existing solutions, a miniature circuit breaker of the present invention does not require current shunting of the temperature control component. The operating mechanism, overload protection device, and movable contact 8 are all located in the same cavity of the housing 1. By adding a partition 41 in the housing 1, the movable contact 8 and the thermal trip rod 42 are respectively arranged in two different planes. The bimetallic strip 61, which was originally in the same plane as the movable contact 8, is also separated from the movable contact 8 by the partition 41 and is located in a different plane. In addition, the temperature control component is installed in a space close to the movable contact 8. This shortens the length of the current-carrying conductor of the temperature control component, reduces internal resistance and heat generation, and avoids damage to components caused by excessive heating of the temperature control component.

[0025] Combine Figure 1-4Provided is an embodiment of a miniature circuit breaker, comprising a housing 1 and a handle 2 disposed on the housing 1, an overload protection device and an operating mechanism connected to a moving contact 8 are provided within the housing 1, the overload protection device comprising a temperature control assembly having a bimetallic strip 61 and a temperature control protection device, the operating mechanism comprising a contact support and a tripping catch 31 and a lock catch 32 pivotally disposed on the contact support, the contact support being connected to the moving contact 8, one end of the tripping catch 31 and the lock catch 32 being snap-connected to each other, the other end of the tripping catch 31 being provided with a latch for engaging with the handle 2 connected to the connecting rod 33, the handle 2 and the operating mechanism are located in the upper part of the housing 1, a static contact is provided on one side of the moving contact 8 to cooperate with the moving contact 8, the static contact is provided on the static contact plate 9, a temperature control component is provided on the other side of the moving contact 8, an incoming line terminal (not shown in the figure) connected to the moving contact 8 is provided on the side of the housing 1 close to the moving contact 8, an outgoing line terminal (not shown in the figure) is provided on the side of the housing 1 close to the static contact, the temperature control component is located on the side of the moving contact 8 close to the incoming line terminal, and the temperature control component drives The temperature control protection device arranged in the housing 1 triggers the operating mechanism to unlock and trip the circuit breaker. The temperature control protection device includes a partition 41 and a thermal trip rod 42. The thermal trip rod 42 can rotate on the partition 41 to trigger the operating mechanism to unlock. The partition 41 separates the moving contact 8 and the thermal trip rod 42 in two different planes. Preferably, the partition 41 is a partition 41 in the shape of a right triangle arranged in the middle of the housing 1. The thermal trip rod 42 is rotatably mounted on the upper part of the partition 41. One end of the thermal trip rod 42 extends out of the partition 41 as an unlocking end 421 to contact the operating mechanism. The other end of the thermal trip rod 42 serves as the driving end 422 and is located in the middle of the partition 41. The temperature control assembly includes a bimetallic strip 61 and a current-carrying conductor. The fixed end of the bimetallic strip 61 is located on the housing 1 near the side of the moving contact 8. The bimetallic strip 61 is connected to the incoming line terminal through the current-carrying conductor. When the circuit breaker is overloaded, the bimetallic strip 61 is bent by heat, causing the movable end 611 of the bimetallic strip 61 to drive the thermal trip rod 42 to rotate and trigger the operating mechanism to trip and disconnect. The movable end 611 of the bimetallic strip 61 is located above the partition 41. In this embodiment, the trip rod 42 cooperates with the lock 32 of the operating mechanism. The trip 31 of the operating mechanism is in a snap connection with the lock 32. The rotation of the thermal trip rod 42 drives the lock 32 to rotate, releasing the snap connection between the lock 32 and the trip 31, causing the circuit breaker to trip and disconnect.

[0026] It should be noted that the purpose of adding a partition 41 in the shell 1 is to fully separate the space near the moving contact 8, increase its space utilization, and enable the temperature control component to be installed in the space near the moving contact 8. Of course, by increasing the space between the moving contact 8 and the incoming terminal by increasing the shell 1, the temperature control component can also be installed near the moving contact 8, but this is not conducive to the miniaturization design of the circuit breaker.

[0027] In addition, the incoming line terminal and the outgoing line terminal can be adjusted to the outgoing line terminal and the incoming line terminal according to the user's wiring method.

[0028] The temperature control component is specifically as follows Figure 5 As shown, it includes a bimetallic strip 61, a current-carrying conductor and a bracket 63. The bracket 63 is used to fix the current-carrying conductor and the bimetallic strip 61 between the incoming terminal and the moving contact 8. One end of the bracket 63 is connected to the fixed end of the bimetallic strip 61, and the other end of the bracket 63 forms a bifurcated structure with the movable end 611 of the bimetallic strip 61. The other end of the bracket 63 is used to connect with the adjustment member 7 provided on one side of the housing 1. Preferably, the bracket 63 is tilted along the oblique edge of the partition 41 for connection with the adjustment member 7 on one side of the housing 1. The adjustment member 7 is tilted toward the oblique edge of the partition 41, which further shortens the length of the bracket 63. Provided is a Figure 7 The current-carrying conductor structure shown in FIG. 1 includes a current-carrying plate 623, a first soft conductor 621, and a second soft conductor 622. One end of the current-carrying plate 623 is connected to the incoming line terminal, and the other end of the current-carrying plate 623 is connected to the second soft conductor 622. The first soft conductor 621 is connected to the moving contact 8. One end of the first soft conductor 621 is connected to the bimetallic strip 61, and the other end of the first soft conductor 621 is connected to the moving contact 8. Of course, the first soft conductor 621 and the second soft conductor 622 can be combined into one soft conductor. The soft conductor only needs to connect the current-carrying plate 623, the moving contact 8, and the bimetallic strip 61 together, and its specific form is not limited. The movable end 611 of the bimetallic strip 61 extends to the driving end 422 on the partition 41 for driving the thermal trip rod 42. Furthermore, an arc-starting plate 64 for introducing the arc into the arc extinguishing chamber is preferably connected to the current-carrying conductor, and the arc-starting plate 64 is in the same plane as the moving contact 8. The adjusting member 7 is a screw.

[0029] The separator 41 is as follows Figure 6As shown, a first critical point 411, a second critical point 412, and a limiting portion 413 are provided on the partition 41. The first critical point 411 and the second critical point 412 are used to limit the thermal trip rod 42. Under the limiting action of the first critical point 411 and the second critical point 412, the thermal trip does not interfere with the operating mechanism when the circuit breaker is operating normally. The middle portion of the thermal trip rod 42 is rotatably mounted on the partition 41. One end of the thermal trip rod 42 serves as an unlocking end 421, which passes through the gap between the first critical point 411 and the second critical point 412 and cooperates with the operating mechanism. The other end of the thermal trip rod 42 serves as a driving end 422, which cooperates with the movable end 611 of the bimetallic strip 61. The limiting portion 413 is used to limit the bimetallic strip 61, so that the bimetallic strip 61 bends within a limited space under the action of the limiting portion 413. The limiting space of the limiting portion 413 is related to the degree of bending of the bimetallic strip 61 when overloaded.

[0030] according to Figure 6 An optimal solution for a partition 41 is provided, wherein the partition 41 is in the shape of a right triangle as a whole, and a spindle for rotatably mounting a thermal trip rod 42 is provided on the upper portion of the partition 41, and two protrusions are provided on the side of the spindle close to the operating mechanism, respectively serving as a first critical point 411 and a second critical point 412, wherein the first critical point 411 is located on the side close to the temperature control component, and the second critical point 412 is located on the side away from the temperature control component; when the circuit breaker is not overloaded, the thermal trip rod 42 is located on the side close to the first critical point 411; when the circuit breaker is overloaded, the thermal trip rod 42 is driven by the bimetallic strip 61 to approach the second critical point 412, and at the same time, the unlocking end 421 of the thermal trip rod 42 causes the operating mechanism to trip, thereby causing the circuit breaker to trip and cut off power. The partition 41 is provided with a longitudinal rib, with a groove serving as a stopper 413 in its center. The movable end 611 of the bimetallic strip 61 passes through the groove to engage with the driving end 422 of the thermal trip rod 42. When the circuit breaker is not overloaded, the movable end 611 of the bimetallic strip 61 is adjacent to the lower sidewall of the groove. When the circuit breaker is overloaded, the movable end 611 of the bimetallic strip 61 moves toward the upper sidewall of the groove to drive the thermal trip rod 42 to rotate. A comb-shaped groove is provided on the right-angled side of the partition 41 near the arc extinguishing chamber, which cooperates with the arc extinguishing grid of the arc extinguishing chamber to adjust the air pressure in the arc extinguishing chamber. A circular groove is provided above the comb-shaped groove for mating with the static contact.

[0031] The arc extinguishing chamber is located on the side of the moving contact 8 away from the temperature control component and below the static contact. The moving contact 8 swings so that the moving contact at one end contacts or separates from the static contact on the static contact, and the static contact extends to the arc entry side of the arc extinguishing chamber. The partition 41 is located on the side of the arc extinguishing chamber close to the moving contact 8, corresponding to the swinging space of the moving contact 8, only isolating the swinging space of the moving contact 8, and separating the moving contact 8 from the thermal trip rod 42 and the movable end 611 of the bimetallic strip 61 on different planes, without occupying the space of the arc extinguishing chamber and without affecting the arc extinguishing ability.

[0032] The thermal trip rod 42 mounted on the partition 41 is preferably as follows Figure 2-4 As shown, the thermal trip rod 42 is a rod body with one end being thicker and the other end being thinner. The middle portion of the thermal trip rod 42 is circular and is used to be rotatably connected to the partition 41. The thinner end of the thermal trip rod 42 serves as a driving end 422 for cooperating with the movable end 611 of the bimetallic strip 61, and the end of the driving end 422 is blunt-round. The thicker end of the thermal trip rod 42 serves as an unlocking end 421, and its end is bent to one side to trigger the operating mechanism to trip.

[0033] Preferably, an unlocking portion 321 that cooperates with the unlocking end 421 of the thermal trip rod 42 is provided at one end of the lock 32 of the operating mechanism. The unlocking portion 321 is located on the edge of one side of the lock 32 close to the incoming terminal. The unlocking portion 321 is a raised structure protruding from the edge of the lock 32, and the unlocking end 421 of the thermal trip rod 42 is located on the side opposite to the unlocking portion 321.

[0034] The above description is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the invention, a number of simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A miniature circuit breaker, comprising a housing (1) and a handle (2) arranged on the housing (1), an overload protection device and an operating mechanism connected to a moving contact (8) are provided in the housing (1), the overload protection device comprises a temperature control component having a bimetallic strip (61), an incoming line terminal connected to the moving contact (8) is provided on one side of the housing (1) close to the moving contact (8), a stationary contact cooperating with the moving contact (8) is provided on one side of the moving contact (8), and the temperature control component is provided on the other side of the moving contact (8), characterized in that: The overload protection device further comprises a temperature control protection device, and when overloaded, the temperature control component drives the temperature control protection device arranged in the housing (1) to trigger the circuit breaker to trip; The temperature control protection device comprises a partition (41) and a thermal trip rod (42), wherein the thermal trip rod (42) can rotate on the partition (41) to trigger the circuit breaker to trip, and the partition (41) separates the moving contact (8) and the thermal trip rod (42) in two different planes; the temperature control component comprises a bimetallic strip (61) and a current-carrying conductor, wherein the fixed end of the bimetallic strip (61) is located on the housing (1) on the side close to the moving contact (8), and the bimetallic strip (61) is connected to the incoming line terminal through the current-carrying conductor. When the circuit breaker is overloaded, the bimetallic strip (61) is bent by heat, so that the movable end (611) of the bimetallic strip (61) drives the thermal trip rod (42) to rotate and trigger the circuit breaker to trip and disconnect.

2. A miniature circuit breaker according to claim 1, characterized in that: The temperature control assembly further comprises a bracket (63) for fixing and mounting the bimetallic strip (61) and the current-carrying conductor, one end of the bracket (63) being connected to the fixed end of the bimetallic strip (61), the other end of the bracket (63) forming a bifurcated structure with the movable end (611) of the bimetallic strip (61), and the other end of the bracket (63) being used to connect to an adjusting member (7) provided on one side of the housing (1).

3. A miniature circuit breaker according to claim 1, characterized in that: The partition (41) is provided with a first critical point (411), a second critical point (412) and a limiting portion (413); the first critical point (411) and the second critical point (412) are used to cooperate with the thermal trip rod (42) in a limiting manner; the middle part of the thermal trip rod (42) is rotatably mounted on the partition (41); one end of the thermal trip rod (42) serves as an unlocking end (421) and passes through the gap between the first critical point (411) and the second critical point (412) to cooperate with the operating mechanism; the other end of the thermal trip rod (42) serves as a driving end (422) and cooperates with the movable end (611) of the bimetallic strip (61); and the limiting portion (413) is used to cooperate with the bimetallic strip (61) in a limiting manner.

4. A miniature circuit breaker according to claim 3, characterized in that: The partition (41) is in the shape of a right triangle as a whole. A core shaft for rotatably mounting a thermal trip rod (42) is provided on the upper part of the partition (41). Two protrusions are provided on the side of the core shaft close to the operating mechanism, serving as a first critical point (411) and a second critical point (412), respectively. The first critical point (411) is located on the side close to the temperature control component, and the second critical point (412) is located on the side away from the temperature control component. A longitudinal rib is provided on the partition (41), and a groove serving as a limiting portion (413) is provided in the middle of the rib. The movable end (611) of the bimetallic strip (61) passes through the groove to cooperate with the driving end (422) of the thermal trip rod (42).

5. The miniature circuit breaker according to claim 1, characterized in that: The current-carrying conductor comprises a current-carrying plate (623), a first soft conductor (621) and a second soft conductor (622); one end of the current-carrying plate (623) is connected to the incoming terminal; the other end of the current-carrying plate (623) is connected to the second soft conductor (622); the first soft conductor (621) is connected to the moving contact (8); the first soft conductor (621) is connected to the second soft conductor (622); one end of the first soft conductor (621) is connected to the bimetallic strip (61); and the other end of the first soft conductor (621) is connected to the moving contact (8).

6. A miniature circuit breaker according to claim 1, characterized in that: The middle portion of the thermal trip rod (42) is circular and is used for being rotatably connected to the partition (41); one end of the thermal trip rod (42) serves as a driving end (422) for cooperating with the movable end (611) of the bimetallic strip (61); the end of the driving end (422) is blunt-circular; the other end of the thermal trip rod (42) serves as an unlocking end (421), the end of which is bent to one side for triggering the circuit breaker to trip.

7. The miniature circuit breaker according to claim 1, characterized in that: The partition (41) is in the shape of a right triangle as a whole. The thermal trip rod (42) is rotatably mounted on the upper part of the partition (41). One end of the thermal trip rod (42) serves as an unlocking end (421) extending out of the partition (41) to cooperate with the operating mechanism. The other end of the thermal trip rod (42) serves as a driving end (422) and is located in the middle of the partition (41). The temperature control component comprises a bimetallic strip (61), a current-carrying conductor, and a bracket (63). The bracket (63) is used to fix the current-carrying conductor and the bimetallic strip (61) between the incoming terminal and the moving contact (8). The movable end (611) of the bimetallic strip (61) extends to the driving end (422) of the thermal trip rod (42) on the partition (41). The bracket (63) is arranged obliquely along the hypotenuse edge of the partition (41) for connecting to an adjusting member (7) on one side of the housing (1). The adjusting member (7) is arranged obliquely toward the hypotenuse of the partition (41).

8. The miniature circuit breaker according to claim 1, characterized in that: The operating mechanism comprises a contact support and a trip buckle (31) and a lock buckle (32) respectively pivotally arranged on the contact support; the contact support is connected to the moving contact (8); one end of the trip buckle (31) and the lock buckle (32) are mutually buckled; the other end of the trip buckle (31) is provided with a connecting rod (33) for connecting to the handle (2); the other end of the lock buckle (32) is provided with an unlocking portion (321) that cooperates with the thermal trip rod (42).

9. A miniature circuit breaker according to claim 8, characterized in that: The unlocking portion (321) is located on a side edge of the lock catch (32) close to the incoming terminal, and the unlocking portion (321) is a protruding structure protruding from the edge of the lock catch (32); an arc striking plate (64) for introducing an arc into the arc extinguishing chamber is also provided on the current-carrying conductor, and the arc striking plate (64) and the moving contact (8) are located on the same plane.

10. The miniature circuit breaker according to claim 1, characterized in that: An arc extinguishing chamber is provided in the housing (1), the arc extinguishing chamber being located on a side of the moving contact (8) away from the temperature control component and below the static contact, and the partition (41) being located on a side of the arc extinguishing chamber close to the moving contact (8).

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