WO2021175113A1

WO2021175113A1 - Miniature circuit breaker

Info

Publication number: WO2021175113A1
Application number: PCT/CN2021/076633
Authority: WO
Inventors: 陈在伟
Original assignee: 浙江正泰电器股份有限公司
Priority date: 2020-03-06
Filing date: 2021-02-12
Publication date: 2021-09-10
Also published as: CN113363120A; AU2021229961B2; ZA202208519B; EP4117010A1; EP4117010A4; AU2021229961A1

Abstract

A miniature circuit breaker, comprising a housing and a handle. An overload protection device and an operating mechanism which is connected to a moving contact are provided in the housing; the overload protection device comprises a temperature control assembly provided with a bimetallic strip; the side in the housing close to the moving contact is provided with an incoming line connecting terminal connected to the moving contact; a stationary contact matching the moving contact is provided on one side of the moving contact, and the temperature control assembly is provided on the other side of the moving contact; when overload, the temperature control assembly drives a temperature control protection device provided in the housing to trigger the circuit breaker to trip; the temperature control protection device comprises a separation plate and a thermal trip rod; the separation plate separates the moving contact and the thermal trip rod in two different planes; the temperature control assembly comprises the bimetallic strip and a current-carrying conductor; when the circuit breaker is overloaded, a movable end of the bimetallic strip drives the thermal trip rod to rotate to trigger the circuit breaker to trip. The present utility model reduces the length of the current-carrying conductor of the temperature control assembly, decreases the internal resistance and reduces heat generation, and avoids damage to parts caused by excessive temperature rise of the temperature control assembly.

Description

Miniature Circuit Breaker

Technical field

The invention relates to the technical field of low-voltage electrical appliances, in particular to a small circuit breaker.

Background technique

The overload protection device in the low-voltage terminal type miniature circuit breaker is not easy to control the delay verification characteristics of the rated current of 100A and above, which is mainly reflected in the inability to properly balance the delay verification time and temperature rise. At present, the most commonly used method for circuit breakers is to shunt the current of the overload protection device, which reduces the impact on the temperature rise of the circuit breaker by reducing the heating of the double gold element. However, the biggest impact of the current shunt on the overload protection device is the short delay. The calibration time is too long and relatively discrete, which greatly reduces the production efficiency and pass rate of the product.

Summary of the invention

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.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

A miniature circuit breaker includes a housing and a handle arranged on the housing. An overload protection device and an operating mechanism connected with a moving contact are arranged in the housing. The overload protection device includes a temperature control assembly with a bimetallic sheet , The side of the shell close to the moving contact is provided with the wire-in terminal connecting terminal connected with the moving contact. One side is provided with a temperature control component, the overload protection device further includes a temperature control protection device, when overload, the temperature control component drives the temperature control protection device arranged in the housing to trigger the tripping of the circuit breaker; the temperature control protection device includes A partition and a thermal trip rod, the thermal trip rod can be rotated on the partition to trigger the circuit breaker to trip, the partition separates the moving contact and the thermal trip rod in two different planes; the temperature control assembly includes The bimetallic strip and the current-carrying conductor, the fixed end of the bimetallic strip is located on the shell near the side of the movable contact, and the bimetallic strip is connected to the terminal of the incoming line through the current-carrying conductor. When the circuit breaker is overloaded, The bimetallic strip is heated and bent, so that the movable end of the bimetallic strip drives the thermal trip lever to rotate to trigger the circuit breaker to trip and disconnect.

Further, the temperature control assembly further includes a bracket for fixed installation of the bimetallic strip and the current-carrying conductor, one end of the bracket is connected with the fixed end of the bimetallic strip, and the other end of the bracket is separated from the movable end of the bimetallic strip. It has a fork structure, and the other end of the bracket is used to connect with an adjusting member arranged on one side of the housing.

Further, a first critical point, a second critical point, and a limiting portion are provided on the partition plate, and the first critical point and the second critical point are used for limiting and cooperating with the thermal trip bar, and the thermal trip The middle part of the rod is rotatably mounted on the partition. One end of the thermal trip rod is used as the unlocking end to pass 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 is used as the driving end to cooperate with the operating mechanism. The movable end of the bimetallic piece is matched; the limiting part is used for the restraining and fitting of the bimetallic piece.

Further, the partition is a right triangle as a whole, a mandrel for rotating and installing the thermal tripping rod is provided on the upper part of the partition, and two protrusions are provided on the side of the mandrel close to the operating mechanism as the first critical point and The second critical point, 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 far away from the temperature control component; a longitudinal rib is provided on the partition plate, and the rib The middle part is provided with a groove serving as a limit part, and the movable end of the bimetallic sheet passes through the groove to be matched with the driving end of the thermal tripping rod.

Further, the current-carrying conductor includes a current-carrying board, a first flexible conductor, and a second flexible conductor, one end of the current-carrying board is connected to the wire-in terminal connection terminal, and the other end of the current-carrying board is connected to the second flexible conductor, The first flexible conductor is connected with the moving contact, the first flexible conductor is connected with the second flexible conductor, one end of the first flexible conductor is connected with the bimetal, and the other end of the first flexible conductor is connected with the moving contact.

Further, the middle part of the thermal trip rod is circular and is used to rotatably connect with the partition plate, one end of the thermal trip rod is used as the driving end for mating with the movable end of the bimetallic strip, and the end of the driving end is blunt round Shape; The other end of the thermal trip lever is used as the unlocking end, and its end is bent to one side for triggering the circuit breaker trip.

Further, the partition is a right-angled triangle as a whole, the thermal tripping rod is rotatably installed on the upper part of the partition, one end of the thermal tripping rod is used as the unlocking end to extend out of the partition to cooperate with the operating mechanism, and the other end of the thermal tripping rod is used as The drive end is located in the middle of the partition; the temperature control assembly includes a bimetallic sheet, a current-carrying conductor and a bracket, and the bracket is used to fix the current-carrying conductor and the bimetallic sheet between the wire-in end terminal and the moving contact. The movable end of the bimetallic strip extends to the driving end of the partition for driving the thermal tripping rod, and the bracket is obliquely arranged along the oblique edge of the partition for connection with the adjusting member on one side of the housing. The adjusting member is arranged obliquely toward the oblique side of the partition.

Further, the operating mechanism includes a contact support and a jumper and a lock buckle respectively pivotally arranged on the contact support, the contact support is connected with the movable contact, and one end of the jumper and the lock buckle each other For connection, the other end of the jumper is provided with a connecting rod for connecting with the handle, and the other end of the locker is provided with an unlocking part matched with the thermal tripping rod.

Further, the unlocking portion is located on the side edge of the lock buckle close to the terminal of the wire inlet, and the unlocking portion is a convex structure protrudingly arranged on the edge of the lock buckle; the current-carrying conductor is also provided with an arc for introducing the arc into the arc extinguishing The arc ignition plate of the chamber, the arc ignition plate and the movable contact are located on the same plane.

Further, an arc extinguishing chamber is provided in the housing, and 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 .

Compared with the existing solution, the miniature circuit breaker of the present invention does not need to perform current shunting on the temperature control component, and only by adding a partition in the shell, the movable contact and the thermal tripping rod are respectively arranged in two different locations. In the same plane as the movable contact, the bimetallic strip that was originally in the same plane as the movable contact is also in two planes with the movable contact under the separation of the partition. The length of the current-carrying conductor of the control assembly is shortened, which reduces the internal resistance and heat generation, and avoids damage to the parts due to the excessive temperature rise of the temperature control assembly.

In addition, by arranging the first critical point, the second critical point and the limit part on the partition, under the restriction of the first critical point and the second critical point, the circuit breaker will not be thermally tripped during normal operation. The interference of the rod, the limit part is used to limit the range of movement of the bimetallic strip and avoid interference to the normal operation of the circuit breaker.

Description of the drawings

Figure 1-3 is a schematic diagram of the structure of a miniature circuit breaker of the present invention;

Fig. 4 is an exploded schematic diagram of Fig. 2;

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

Figure 6 is a schematic diagram of the structure of a partition in a miniature circuit breaker of the present invention;

Fig. 7 is a structural schematic diagram of a current-carrying conductor in a miniature circuit breaker of the present invention.

Detailed ways

The specific implementation of a miniature circuit breaker of the present invention will be further described below with reference to the embodiments given in FIGS. 1 to 7. A miniature circuit breaker of the present invention is not limited to the description of the following embodiments.

A miniature circuit breaker includes a housing 1 and a handle 2 arranged on the housing 1. An overload protection device and an operating mechanism connected with a moving contact 8 are provided in the housing 1. The overload protection device includes a double The temperature control assembly of the metal sheet 61 is provided with an incoming terminal connecting terminal connected to the movable contact 8 on the side close to the movable contact 8 in the housing 1, and a side of the movable contact 8 is provided with a movable contact 8. The matched static contact is provided with the temperature control component on the other side of the moving contact 8. The overload protection device also includes a temperature control protection device, and the temperature control component is driven and arranged in the housing 1 when overloaded. The temperature control protection device triggers the tripping of the circuit breaker; the temperature control protection device includes a partition 41 and a thermal tripping rod 42. The thermal tripping rod 42 can be rotated on the partition 41 to trigger the circuit breaker to trip. The partition 41 will The movable contact 8 and the thermal trip bar 42 are separated in two different planes; the temperature control assembly includes a bimetal 61 and a current-carrying conductor. The fixed end of the bimetal 61 is located near the movable contact 8 On the shell 1 on the side, the bimetal 61 is connected to the terminal of the incoming terminal through a current-carrying conductor. When the circuit breaker is overloaded, the bimetal 61 is heated and bent, so that the movable end 611 of the bimetal 61 drives the thermal trip Rotation of the lever 42 triggers the circuit breaker to trip and open.

Compared with the existing solution, the miniature circuit breaker of the present invention does not require current shunting of temperature control components. The operating mechanism, overload protection device, and movable contact 8 are all located in the same cavity of the housing 1, and the A partition 41 is added to the body 1, and the movable contact 8 and the thermal trip lever 42 are respectively arranged in two different planes, so that the bimetal 61 that is originally on the same plane as the movable contact 8 is also separated by the partition 41 Under the action, it is in two planes with the moving contact 8, and then the temperature control component is installed in the space close to the moving contact 8, so that the length of the current-carrying conductor of the temperature control component is shortened, the internal resistance is reduced, and the heat generation is reduced to avoid The parts are damaged due to the temperature control component heating up too high.

An embodiment is provided in conjunction with Figures 1-4. A miniature circuit breaker includes a housing 1 and a handle 2 arranged on the housing 1. The housing 1 is provided with an overload protection device and a movable contact 8 connected to it. Operating mechanism, the overload protection device includes a temperature control assembly with a bimetal 61 and a temperature control protection device, the operating mechanism includes a contact support and a jumper 31 and a lock 32 that are respectively pivotally arranged on the contact support , The contact support is connected to the movable contact 8, one end of the jumper 31 and the lock buckle 32 are connected to each other by a snap connection, and the other end of the jumper 31 is provided with a connecting rod 33 for connecting with the handle 2. The handle 2 and the operating mechanism are located in the upper part of the housing 1, on one side of the moving contact 8 is provided with a static contact that cooperates with the moving contact 8. The static contact is arranged on the static contact plate 9, and the moving contact 8 The other side is provided with a temperature control component. The side of the housing 1 close to the moving contact 8 is provided with an incoming terminal connection terminal (not shown in the figure) connected to the moving contact 8, which is close to the housing 1 One side of the static contact is provided with an outlet terminal terminal (not shown in the figure), the temperature control component is located on the side of the movable contact 8 close to the inlet terminal terminal, and the temperature control component is driven and arranged in the housing 1 The temperature control protection device triggers the unlocking of the operating mechanism to trip and disconnect the circuit breaker. The temperature control protection device includes a partition 41 and a thermal trip lever 42. The thermal trip lever 42 can be rotated on the partition 41 to trigger the unlocking of the operating mechanism The partition 41 separates the movable contact 8 and the thermal trip rod 42 in two different planes. Preferably, the partition 41 is a right triangle partition 41 arranged in the middle of the housing 1, and the thermal trip rod 42 rotates. Installed on the upper part of the partition 41, one end of the thermal trip lever 42 is used as the unlocking end 421 to extend out of the partition 41 to cooperate with the operating mechanism, and the other end of the thermal trip lever 42 is located in the middle of the partition 41 as the driving end 422; The temperature control assembly includes a bimetal 61 and a current-carrying conductor. The fixed end of the bimetal 61 is located on the housing 1 on the side close to the movable contact 8. The bimetal 61 is connected to the wire-in terminal through the current-carrying conductor When the circuit breaker is overloaded, the bimetal 61 is heated and bent, so that the movable end 611 of the bimetal 61 drives the thermal trip lever 42 to rotate to trigger the operating mechanism to trip and disconnect, and the movable end 611 of the bimetal 61 is located at the partition. Above the board 41. In this embodiment, the trip lever 42 is matched with the lock buckle 32 of the operating mechanism, and the jump buckle 31 and the lock buckle 32 of the operating mechanism are snap-connected. The buckle connection of 31 makes the circuit breaker trip and disconnect.

It should be noted that the significance of adding a partition 41 in the housing 1 is to fully separate the space near the moving contact 8 and increase its space utilization, so that the temperature control component is installed in the space near the moving contact 8. Of course By increasing the housing 1 to increase the space between the moving contact 8 and the terminal of the incoming wire, the temperature control component can also be installed near the moving contact 8, but this is not conducive to the miniaturization of the circuit breaker.

In addition, the incoming wire terminal and the wire outlet terminal can be adjusted to the wire outlet terminal and the wire inlet terminal according to the change of the user's wiring mode.

The temperature control assembly is specifically shown in FIG. 5, and includes a bimetal 61, a current-carrying conductor, and a bracket 63. The bracket 63 is used to fix the current-carrying conductor and the bimetal 61 to the wire-in terminal and the movable contact. Between the heads 8, one end of the bracket 63 is connected to the fixed end of the bimetal 61, the other end of the bracket 63 and the movable end 611 of the bimetal 61 form a bifurcated structure, and the other end of the bracket 63 is used for Is connected to the adjusting member 7 on the side of the housing 1. Preferably, the bracket 63 is arranged obliquely along the oblique edge of the partition 41 for connecting with the adjusting member 7 on the side of the housing 1. The adjusting member 7 is inclined toward the side of the partition 41 The hypotenuse setting further shortens the length of the bracket 63. A current-carrying conductor structure as shown in FIG. 7 is provided. The current-carrying conductor includes a current-carrying plate 623, a first flexible conductor 621, and a second flexible conductor 622. One end of the current-carrying plate 623 is connected to the inlet end Terminal connection, the other end of the current carrying plate 623 is connected to the second flexible conductor 622, the first flexible conductor 621 is connected to the movable contact 8, one end of the first flexible conductor 621 is connected to the bimetal 61, and the first flexible conductor 621 The other end is connected to the moving contact 8. Of course, the first flexible conductor 621 and the second flexible conductor 622 can be combined into one flexible conductor, and the flexible conductor only needs to connect the current carrying plate 623, the moving contact 8 and the bimetal 61 Together, there is no restriction on its specific form. The movable end 611 of the bimetal 61 extends to the driving end 422 of the partition 41 for driving the thermal tripping rod 42. Further, it is preferable that the current-carrying conductor is connected with a pilot arc for introducing the arc into the arc extinguishing chamber. The arc-striking plate 64 and the movable contact 8 are in the same plane. The adjusting member 7 is a screw.

The partition 41 is specifically shown in FIG. 6, 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 is used to cooperate with the limit of the thermal trip lever 42. Under the limit action of the first critical point 411 and the second critical point 412, the thermal trip will not interfere with the operating mechanism when the circuit breaker is working normally; The middle part of the thermal tripping rod 42 is rotatably mounted on the partition 41, and one end of the thermal tripping rod 42 is used as the unlocking end 421 to pass 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 trip lever 42 is used as the driving end 422 to cooperate with the movable end 611 of the bimetal 61; Bending occurs in a limited space under the action, and the limiting space of the limiting portion 413 is related to the bending degree of the bimetal 61 when overloaded.

According to Fig. 6, an optimal solution for the partition 41 is provided. The partition 41 is a right-angled triangle as a whole. The upper part of the partition 41 is provided with a mandrel for rotating and installing the thermal trip lever 42. The mandrel is close to the operating mechanism. Two protrusions are provided on one side 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 a side far away from the temperature control component. When the circuit breaker is not overloaded, the thermal trip lever 42 is located on the side close to the first critical point 411; when the circuit breaker is overloaded, the thermal trip lever 42 is driven by the bimetal 61 to the second critical The point 412 is approaching, and at the same time, the unlocking end 421 of the thermal trip lever 42 trips the operating mechanism, thereby tripping the circuit breaker and cutting off the power. A longitudinal rib is provided on the partition 41, and a groove as a limiting portion 413 is provided in the middle of the rib. 42 to the driving end 422; when the circuit breaker is not overloaded, the movable end 611 of the bimetal 61 is close to the lower side wall of the groove, and when the circuit breaker is overloaded, the movable end 611 of the bimetal 61 faces the groove The upper side wall approaches to drive the thermal trip lever 42 to rotate. The right-angle side of the partition 41 close to the arc extinguishing chamber is provided with a comb-shaped groove for cooperating with the arc extinguishing grid of the arc extinguishing chamber to adjust the air pressure of the arc extinguishing chamber. There is a groove for the fixed contact to be installed on the upper part of the, and the groove is circular.

The arc extinguishing chamber is located on the side of the moving contact 8 far away from the temperature control component and under the static contact. The moving contact 8 swings to make the moving contact at one end contact or separate from the static contact on the static contact. The contact extends to the arc-in side of the arc extinguishing chamber, and the partition 41 is located on the side of the arc extinguishing chamber close to the movable contact 8 and corresponds to the swing space of the movable contact 8 and only isolates the swing space of the movable contact 8 , The movable contact 8 is separated from the thermal trip rod 42 and the movable end 611 of the bimetal 61 on different planes, which does not occupy the space of the arc extinguishing chamber and does not affect the arc extinguishing ability.

The thermal tripping rod 42 installed on the partition 41 is preferably shown in FIGS. 2-4. The thermal tripping rod 42 is a rod body with a thick one end and a thin end. The middle part of the thermal tripping rod 42 is circular and is used for The partition 41 is rotatably connected, the thinner end of the thermal tripping rod 42 is used as the driving end 422 for mating with the movable end 611 of the bimetal 61, and the end of the driving end 422 is blunt round; The thicker end of the rod 42 serves as the unlocking end 421, and its end is bent to one side to trigger the operating mechanism to trip.

Preferably, an unlocking portion 321 that cooperates with the unlocking end 421 of the thermal trip lever 42 is provided at one end of the lock buckle 32 of the operating mechanism. In order to protrude the convex structure with the edge of the lock buckle 32, the unlocking end 421 of the thermal tripping lever 42 is located on the side opposite to the unlocking portion 321.

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

Claims

A miniature circuit breaker, comprising a casing (1) and a handle (2) arranged on the casing (1), an overload protection device and an operation connected with the moving contact (8) are arranged in the casing (1) Mechanism, the overload protection device includes a temperature control assembly with a bimetal (61), and an incoming wire connected to the movable contact (8) is provided on the side of the housing (1) close to the movable contact (8) For the terminal wiring terminal, one side of the moving contact (8) is provided with a static contact matched with the moving contact (8), and the other side of the moving contact (8) is provided with the temperature control component, which is characterized by Lies in:

The overload protection device also includes a temperature control protection device, and when overload, the temperature control component drives the temperature control protection device arranged in the housing (1) to trigger the tripping of the circuit breaker;

The temperature control protection device includes a partition (41) and a thermal trip rod (42). The thermal trip rod (42) can be rotated on the partition (41) to trigger the circuit breaker to trip, and the partition (41) will move. The contact (8) and the thermal trip rod (42) are separated in two different planes; the temperature control component includes a bimetal (61) and a current-carrying conductor, and the fixed end of the bimetal (61) Located on the housing (1) on the side close to the moving contact (8), the bimetal (61) is connected to the terminal of the incoming line through a current-carrying conductor. When the circuit breaker is overloaded, the bimetal (61) is heated Bending, so that the movable end (611) of the bimetal (61) drives the thermal trip lever (42) to rotate to trigger the tripping of the circuit breaker.
The miniature circuit breaker according to claim 1, characterized in that: the temperature control assembly further comprises a bracket (63) for fixedly installing the bimetallic sheet (61) and the current-carrying conductor, the bracket (63) One end of the bracket is connected with the fixed end of the bimetal (61), the other end of the bracket (63) and the movable end (611) of the bimetal (61) form a bifurcated structure, and the other end of the bracket (63) is used for The adjusting member (7) arranged on one side of the casing (1) is connected.
The 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 limit part (413), The first critical point (411) and the second critical point (412) are used to limit and cooperate with the thermal trip rod (42), and the middle of the thermal trip rod (42) is rotatably mounted on the partition plate (41) Above, one end of the thermal trip lever (42) is used as the unlocking end (421) to pass through the gap between the first critical point (411) and the second critical point (412) to cooperate with the operating mechanism, the thermal trip lever (42) The other end is used as the driving end (422) to fit with the movable end (611) of the bimetallic strip (61); the limiting portion (413) is used to limit the fit with the bimetallic strip (61).
A miniature circuit breaker according to claim 3, characterized in that: the partition (41) is a right-angled triangle as a whole, and the upper part of the partition (41) is provided with a heat release lever (42) for rotating installation The mandrel, on the side of the mandrel close to the operating mechanism, two protrusions are respectively used as the first critical point (411) and the second critical point (412). The first critical point (411) is located near the temperature control component On one side, 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 limiting portion (413) is provided in the middle of the rib The movable end (611) of the bimetal (61) passes through the groove for mating with the driving end (422) of the thermal trip lever (42).
The miniature circuit breaker according to claim 1, wherein the current-carrying conductor includes a current-carrying plate (623), a first flexible conductor (621) and a second flexible conductor (622), and the current-carrying conductor One end of the board (623) is connected to the wire-in terminal, the other end of the current-carrying board (623) is connected to the second flexible conductor (622), and the first flexible conductor (621) is connected to the moving contact (8). A flexible conductor (621) is connected to the second flexible conductor (622), one end of the first flexible conductor (621) is connected to the bimetal (61), and the other end of the first flexible conductor (621) is connected to the movable contact (8). )connect.
The miniature circuit breaker according to claim 1, characterized in that: the middle part of the thermal trip rod (42) is circular and is used for rotating connection with the partition plate (41), and the thermal trip rod (42) ) One end is used as the driving end (422) to cooperate with the movable end (611) of the bimetal (61), and the end of the driving end (422) is blunt round; the other end of the thermal trip rod (42) As the unlocking end (421), its end is bent to one side to trigger the circuit breaker to trip.
The miniature circuit breaker according to claim 1, characterized in that the partition (41) is a right triangle as a whole, and the thermal trip lever (42) is rotatably mounted on the upper part of the partition (41), and the thermal trip One end of the rod (42) as the unlocking end (421) extends out of the partition (41) to cooperate with the operating mechanism, and the other end of the thermal trip rod (42) is located in the middle of the partition (41) as the driving end (422); The temperature control assembly includes a bimetallic strip (61), a current-carrying conductor and a bracket (63), and the bracket (63) is used to fix the current-carrying conductor and the bimetallic strip (61) to the wire-in terminal and the movable contact. Between the heads (8), the movable end (611) of the bimetal (61) extends to the driving end (422) of the partition (41) for driving the thermal tripping rod (42), and the bracket ( 63) Obliquely arranged along the oblique edge of the partition (41) for connection with the adjusting member (7) on one side of the housing (1), and the adjusting member (7) is obliquely arranged toward the oblique edge of the partition (41) .
The miniature circuit breaker according to claim 1, characterized in that: the operating mechanism comprises a contact support, and a jumper (31) and a lock (32) pivotally arranged on the contact support. The contact support is connected with the movable contact (8), one end of the jumper (31) and the lock (32) are connected to each other by a snap connection, and the other end of the jumper (31) is provided with a device for connecting with the handle (2) The other end of the connecting rod (33) and the lock catch (32) is provided with an unlocking part (321) matched with the thermal tripping rod (42).
The miniature circuit breaker according to claim 8, characterized in that: the unlocking portion (321) is located on the side edge of the lock (32) close to the terminal of the incoming wire, and the unlocking portion (321) is protruding. The protruding structure on the edge of the lock (32); the current-carrying conductor is also provided with an arc ignition plate (64) for introducing the arc into the arc extinguishing chamber, the arc ignition plate (64) and the movable contact (8) ) Are on the same plane.
The miniature circuit breaker according to claim 1, characterized in that: an arc extinguishing chamber is provided in the housing (1), and the arc extinguishing chamber is located on the side of the moving contact (8) away from the temperature control component, and Located below the static contact, the partition (41) is located on the side of the arc extinguishing chamber close to the moving contact (8).