An operating mechanism for a miniature circuit breaker
The sliding structure of rocker arm, trip latch, and lock solves the problem of large space occupation of miniature circuit breakers, achieving a smaller size design that is easy to install and use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI YONGJI ELECTRICAL HLDG
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-31
AI Technical Summary
The trip and latch of miniature circuit breakers are installed in a hinged manner, which results in a large space occupation and affects the convenience of installation and use.
It adopts a sliding structure with rocker arm, jumper and lock, and lock and release are achieved by tension spring and return spring, which reduces space occupation.
While ensuring functionality, the space occupied inside the circuit breaker housing has been reduced, resulting in a smaller size that facilitates installation and use.
Smart Images
Figure CN224582225U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaker technology, and in particular to an operating mechanism for a miniature circuit breaker. Background Technology
[0002] Miniature circuit breakers are commonly used electrical protection devices with overload and short-circuit protection functions, and are mainly used in circuits with a rated operating current not exceeding 125A. Miniature circuit breakers are often installed in distribution boxes or cabinets, and due to the limited installation space in these spaces, their size is also designed to be relatively small to facilitate installation and use in various locations.
[0003] Currently, in the operating mechanism of miniature circuit breakers, both the trip latch and the lock latch are installed in a hinged manner, and they are locked or released by rotation. This results in the trip latch and the lock latch occupying a large space inside the miniature circuit breaker housing. In order to ensure the internal structural design and electrical performance, the size of the miniature circuit breaker often has to be compromised, causing inconvenience to subsequent installation and use. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides an operating mechanism for a miniature circuit breaker with a small footprint.
[0005] The present invention adopts the following technical solution:
[0006] This utility model provides an operating mechanism for a miniature circuit breaker, including a rocker arm, a trip latch, and a locking latch. The rocker arm is rotatably mounted on a pin of the miniature circuit breaker, and a tension spring is provided between the rocker arm and the housing of the miniature circuit breaker. The trip latch is slidably mounted on the rocker arm and is connected to the handle of the miniature circuit breaker via a connecting rod. The locking latch is rotatably mounted on the rocker arm, and a return spring is provided between the locking latch and the rocker arm. The return spring pushes the locking latch to lock and fix the trip latch. The short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker can abut against the locking latch and disengage the trip latch.
[0007] Preferably, the rocker arm is provided with a hook groove, and the rocker arm forms a limit stop at the hook groove. One end of the tension spring is hooked on the housing of the miniature circuit breaker, and the other end of the tension spring is hooked in the hook groove. The limit stop limits the tension spring in the hook groove.
[0008] Preferably, the rocker arm is provided with an arc-shaped slide groove, and one side of the arc-shaped slide groove is recessed to form an arc-shaped positioning groove. The jumper is located in the arc-shaped positioning groove and is engaged with the arc-shaped slide groove through the engaging part. The jumper can slide along the arc-shaped slide groove under the drive of the handle on the miniature circuit breaker.
[0009] Preferably, the rocker arm is provided with a first abutment groove, the latch is provided with a second abutment groove, and the two ends of the return spring abut against the first abutment groove and the second abutment groove respectively.
[0010] Preferably, the jumper is provided with a plug hole, one end of the connecting rod is rotatably mounted on the handle of the miniature circuit breaker, and the other end of the connecting rod is rotatably inserted into the plug hole.
[0011] Preferably, the latch has an L-shaped notch, and the mating end of the snap fastener mates with the L-shaped notch on the latch.
[0012] Preferably, a push plate is formed on the latch, and the short-circuit protection mechanism of the miniature circuit breaker can abut against the push plate and drive the latch to rotate in the direction of pressing the reset spring.
[0013] Preferably, the latch is provided with a pull rod, and the overload protection mechanism of the miniature circuit breaker can abut against the pull rod and drive the latch to rotate in the direction of pressing the reset spring.
[0014] Preferably, the pull rod is an elastic rod and is rotatably inserted into the through hole of the buckle. The buckle is provided with a first limiting block and a second limiting block at intervals along the rotation direction of the pull rod, and the pull rod is located between the first limiting block and the second limiting block.
[0015] Preferably, a limiting rod extends from the first or second limiting block, and the limiting rod can limit the movement of the pull rod along the axis of the through hole.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] In use, the operating mechanism of this miniature circuit breaker locks the latch and trip latch, causing the rocker arm, trip latch, and latch to rotate as a whole around the pin of the miniature circuit breaker. When the short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker comes into contact with the latch and causes the trip latch to disengage, the trip latch will slide along the rocker arm and thus release the lock. The rocker arm will then reset under the tension of the tension spring. After the latch rotates with the rocker arm to disengage from the short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker, it can also re-lock and fix itself with the trip latch by the return spring.
[0018] Obviously, the operating mechanism of the miniature circuit breaker of this utility model ensures the normal function of the mechanism while allowing the trip latch to slide on the rocker arm. Compared with the installation method of hinged trip latch, it can reduce the space occupied inside the miniature circuit breaker housing, which is conducive to designing a smaller miniature circuit breaker, so as to facilitate installation and use in various places. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the operating mechanism of the miniature circuit breaker in an embodiment of this utility model.
[0020] Figure 2 This is a schematic diagram of the rocker arm on the operating mechanism of a miniature circuit breaker in an embodiment of this utility model.
[0021] Figure 3 This is a first-view view of the trip latch on the operating mechanism of the miniature circuit breaker in an embodiment of this utility model.
[0022] Figure 4 This is a second-view view of the trip latch on the operating mechanism of the miniature circuit breaker in an embodiment of this utility model.
[0023] Figure 5 This is a schematic diagram of the locking mechanism on the operating mechanism of the miniature circuit breaker in this embodiment of the present invention.
[0024] The reference numerals in the attached figures are explained as follows:
[0025] 1. Rocker arm 301, second abutment groove
[0026] 101. Hook groove; 302. L-shaped notch
[0027] 102. Limit stop bar; 303. Push plate
[0028] 103. Arc-shaped slide groove; 304. Tie rod
[0029] 104. Arc-shaped groove; 305. Through hole
[0030] 105. First abutment groove; 306. First limiting block
[0031] 2. Jump buckle 307, second limit block
[0032] 201, Engaging Part 308, Limiting Rod
[0033] 202, Socket 4, Pin
[0034] 203, mating end 5, return spring
[0035] 3. Lock Detailed Implementation
[0036] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.
[0037] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0039] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0040] See Figure 1 This embodiment provides an operating mechanism for a miniature circuit breaker, including a rocker arm 1, a trip latch 2, and a locking latch 3. The rocker arm 1 is rotatably mounted on a pin 4 of the miniature circuit breaker, and a tension spring is provided between the rocker arm 1 and the housing of the miniature circuit breaker. The trip latch 2 is slidably mounted on the rocker arm 1, and the trip latch 2 is connected to the handle of the miniature circuit breaker via a connecting rod. The locking latch 3 is rotatably mounted on the rocker arm 1, and a return spring 5 is provided between the locking latch 3 and the rocker arm 1. The return spring 5 pushes the locking latch 3 to lock and fix the trip latch 2. The short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker can abut against the locking latch 3 and disengage the trip latch 2.
[0041] In this embodiment, when the operating mechanism of the miniature circuit breaker is in use, the latch 3 locks with the trip latch 2, so that the rocker arm 1, the trip latch 2 and the latch 3 rotate as a whole around the pin 4 of the miniature circuit breaker. When the short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker comes into contact with the latch 3 and causes the trip latch 2 to disengage, the trip latch 2 will slide along the rocker arm 1 and thus release the lock. The rocker arm 1 will reset under the tension of the tension spring. After the latch 3 rotates with the rocker arm 1 to disengage from the short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker, it can also be re-locked and fixed with the trip latch 2 by the return spring 5.
[0042] Obviously, the operating mechanism of the miniature circuit breaker in this embodiment ensures the normal function of the mechanism while allowing the trip latch 2 to slide on the rocker arm 1. Compared with the hinged installation method of the trip latch 2, there is no need to set an additional fixed shaft to enable the trip latch 2 to rotate, nor is there a need to consider the clearance space required for the rotation of the trip latch 2. This can reduce the space occupied in the miniature circuit breaker housing, which is conducive to designing a smaller miniature circuit breaker so that it can be installed and used in various places.
[0043] Preferably, see Figure 1 and Figure 2 The rocker arm 1 is provided with a hook groove 101, and a limit stop 102 is formed at the hook groove 101. One end of the tension spring is hooked onto the housing of the miniature circuit breaker, and the other end of the tension spring is hooked into the hook groove 101. The limit stop 102 limits the tension spring within the hook groove 101. The presence of the limit stop 102 prevents the tension spring from disengaging from the hook groove 101 during operation, ensuring the stable operation of the operating mechanism. When installing the operating mechanism, the position of the hook end on the tension spring can be adjusted to avoid the limit stop 102, so that the tension spring is hooked into the hook groove 101.
[0044] Preferably, see Figure 1 , Figure 2 and Figure 4 The rocker arm 1 is provided with an arc-shaped slide groove 103, and one side of the arc-shaped slide groove 103 is recessed to form an arc-shaped placement groove 104. The jumper 2 is located in the arc-shaped placement groove 104 and is engaged with the arc-shaped slide groove 103 through the engaging part 201. The jumper 2 can slide along the arc-shaped slide groove 103 under the action of the handle on the miniature circuit breaker. The arc-shaped slide groove 103 can provide guidance for the sliding of the jumper 2 along the rocker arm 1; while the arc-shaped placement groove 104 can accommodate the jumper 2, reducing the space occupied.
[0045] Preferably, see Figure 1 , Figure 2 and Figure 5 The rocker arm 1 is provided with a first abutting groove 105, and the latch 3 is provided with a second abutting groove 301. The two ends of the return spring 5 abut against the first abutting groove 105 and the second abutting groove 301 respectively, so as to prevent the return spring 5 from disengaging from the rocker arm 1 and the latch 3.
[0046] Preferably, see Figure 1 , Figure 3 and Figure 4 The jumper 2 is provided with a plug hole 202. One end of the connecting rod is rotatably mounted on the handle of the miniature circuit breaker, and the other end of the connecting rod is rotatably inserted into the plug hole 202.
[0047] Preferably, see Figure 1 , Figure 3 , Figure 4 and Figure 5The latch 3 has an L-shaped notch 302. The mating end 203 on the jump latch 2 mates with the L-shaped notch 302 on the latch 3. In addition, the return spring 5 pushes the latch 3 to rotate relative to the rocker arm 1 until it abuts against the jump latch 2. This ensures that the mating end 203 on the jump latch 2 and the L-shaped notch 302 on the latch 3 always remain in a mating state, thereby completing the locking of the jump latch 2.
[0048] Preferably, see Figure 1 and Figure 5 A push plate 303 is formed on the latch 3. The short-circuit protection mechanism of the miniature circuit breaker can abut against the push plate 303 and drive the latch 3 to rotate in the direction of pressing the reset spring 5.
[0049] Preferably, see Figure 1 and Figure 5 The latch 3 is equipped with a pull rod 304. The overload protection mechanism of the miniature circuit breaker can abut against the pull rod 304 and drive the latch 3 to rotate in the direction of pressing the reset spring 5.
[0050] Preferably, see Figure 1 and Figure 5 The pull rod 304 is an elastic rod that rotatably passes through the through hole 305 of the latch 3. The latch 3 is provided with a first limiting block 306 and a second limiting block 307 at intervals along the rotation direction of the pull rod 304, and the pull rod 304 is located between the first limiting block 306 and the second limiting block 307. The two limiting blocks can limit the rotation of the pull rod 304, preventing it from rotating freely around the through hole 305. This allows the latch 3 to rotate towards the direction of pressing the return spring 5. Since the pull rod 304 is an elastic rod, it can be installed by temporarily bending it, and the pull rod 304 will naturally return to its original elastic state after installation.
[0051] Preferably, see Figure 1 and Figure 5 A limiting rod 308 extends from the first limiting block 306 or the second limiting block 307. The limiting rod 308 can limit the movement of the pull rod 304 along the axis of the through hole 305 to prevent the pull rod 304 from disengaging from the through hole 305.
[0052] Better yet, see Figure 5 In this embodiment, the limiting rod 308 extends only from the second limiting block 307.
[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. An operating mechanism of a miniature circuit breaker, characterized by The circuit includes a rocker arm (1), a trip latch (2), and a locking latch (3). The rocker arm (1) is rotatably mounted on the pin (4) of the miniature circuit breaker, and a tension spring is provided between the rocker arm (1) and the housing of the miniature circuit breaker. The trip latch (2) is slidably mounted on the rocker arm (1), and the trip latch (2) is connected to the handle of the miniature circuit breaker via a connecting rod. The locking latch (3) is rotatably mounted on the rocker arm (1), and a return spring (5) is provided between the locking latch (3) and the rocker arm (1). The return spring (5) pushes the locking latch (3) to lock and fix the trip latch (2). The short-circuit protection mechanism or overload protection mechanism of the miniature circuit breaker can abut against the locking latch (3) and disengage the trip latch (2).
2. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that The rocker arm (1) is provided with a hook groove (101), and the rocker arm (1) forms a limit stop (102) at the hook groove (101). One end of the tension spring is hooked on the housing of the miniature circuit breaker, and the other end of the tension spring is hooked in the hook groove (101). The limit stop (102) limits the tension spring in the hook groove (101).
3. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that The rocker arm (1) is provided with an arc-shaped slide groove (103), and one side of the arc-shaped slide groove (103) is recessed to form an arc-shaped placement groove (104). The jump buckle (2) is located in the arc-shaped placement groove (104) and is engaged with the arc-shaped slide groove (103) through the engaging part (201). The jump buckle (2) can slide along the arc-shaped slide groove (103) under the drive of the handle on the miniature circuit breaker.
4. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that The rocker arm (1) is provided with a first abutting groove (105), the latch (3) is provided with a second abutting groove (301), and the two ends of the return spring (5) abut against the first abutting groove (105) and the second abutting groove (301) respectively.
5. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that, The jump buckle (2) is provided with a plug hole (202). One end of the connecting rod is rotatably mounted on the handle of the miniature circuit breaker, and the other end of the connecting rod is rotatably inserted into the plug hole (202).
6. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that The latch (3) is provided with an L-shaped notch (302), and the mating end (203) on the jump buckle (2) is mated with the L-shaped notch (302) on the latch (3).
7. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that A push plate (303) is formed on the latch (3), and the short-circuit protection mechanism of the miniature circuit breaker can abut against the push plate (303) and drive the latch (3) to rotate in the direction of pressing the reset spring (5).
8. The operating mechanism of a miniature circuit breaker according to claim 1, characterized in that The latch (3) is provided with a pull rod (304), and the overload protection mechanism of the miniature circuit breaker can abut against the pull rod (304) and drive the latch (3) to rotate in the direction of pressing the reset spring (5).
9. The operating mechanism of a miniature circuit breaker according to claim 8, characterized in that The pull rod (304) is an elastic rod and is rotatably inserted into the through hole (305) of the latch (3). The latch (3) is provided with a first limiting block (306) and a second limiting block (307) at intervals along the rotation direction of the pull rod (304). The pull rod (304) is located between the first limiting block (306) and the second limiting block (307).
10. The operating mechanism of a miniature circuit breaker according to claim 9, characterized in that The first limiting block (306) or the second limiting block (307) extends a limiting rod (308) therefrom, and the limiting rod (308) can limit the movement of the pull rod (304) along the axis direction of the through hole (305).