三极塑壳断路器布局结构及四极塑壳断路器布局结构
By adjusting the structural layout of the molded case circuit breaker, the positions of the electronic trip unit and the current transformer are adjusted to be above the arc-extinguishing chamber and below the operating mechanism, increasing the space of the arc-extinguishing chamber, solving the problems of structural strength and volume under high current, and realizing the design of a high-performance molded case circuit breaker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI RENMIN ELECTRICAL APP WORKS
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-17
AI Technical Summary
Existing molded case circuit breakers cannot meet the requirements for structural strength, size, and arc extinguishing capability under high current, resulting in insufficient performance at high current frame levels, and increased cost and size, leading to a loss of market competitiveness.
By optimizing the structural layout of the molded case circuit breaker, the positions of the electronic trip unit and the current transformer are adjusted to be above the arc-extinguishing chamber and below the operating mechanism, thereby increasing the space of the arc-extinguishing chamber. Furthermore, a reasonable accessory device design is adopted to optimize the internal wiring and reduce space occupation.
It improves the capacity of the arc-extinguishing chamber and the ultimate breaking capacity of the circuit breaker, enhances structural strength and arc-extinguishing capability, while maintaining a compact size and low cost advantage.
Smart Images
Figure CN224519851U_ABST
Abstract
Claims
1. A layout structure for a three-pole molded case circuit breaker, wherein the molded case circuit breaker includes a housing (1), an operating mechanism (2), a moving contact (3), a stationary contact (4), an arc-extinguishing chamber (5), an electronic trip unit (6), an electromagnetic trip unit (8), and a current transformer (9); The housing (1) has a three-pole structure, and the operating mechanism (2) is movably mounted on the housing (1); The stationary contact (4) is fixedly assembled at the bottom inside the housing (1), the moving contact (3) is movably assembled on the housing (1) and the moving contact (3) is connected to the operating mechanism (2) in a transmission manner, and the arc-extinguishing chamber (5) is fixedly assembled inside the housing (1) and the arc-extinguishing chamber (5) surrounds the contact end of the moving contact (3). The electronic trip unit (6), the electromagnetic trip unit (8), and the current transformer (9) are respectively disposed on the housing (1); Its features are, The moving contact (3), the stationary contact (4), and the arc-extinguishing chamber (5) are arranged in an L-shape; The operating mechanism (2) is located above the transmission end of the moving contact (3), and the electronic trip unit (6) is located above the arc-extinguishing chamber (5) and in front of the operating mechanism (2). The electromagnetic trip unit (8) is located on the side of the operating mechanism (2). The trip unit wire (81) led out from the electromagnetic trip unit (8) passes through the rear side of the operating mechanism (2) and is connected to the electronic trip unit (6) from the other side of the operating mechanism (2). The current transformer (9) is located below the operating mechanism (2) and behind the moving contact (3). The current transformer wire (91) led out from the current transformer (9) is connected to the electronic trip unit (6).
2. The layout structure of a three-pole molded case circuit breaker according to claim 1, wherein The molded case circuit breaker also includes accessory devices (7); The accessory device (7) is disposed on the side of the operating mechanism (2), and the accessory device (7) is located between the electronic trip unit (6) and the electromagnetic trip unit (8); The accessory wires leading out from the accessory device (7) are directly connected to the electronic trip unit (6); The trip cable (81) is guided by a slot on the accessory device (7); The transformer wire (91) is guided by a slot on the accessory device (7).
3. A three-pole molded case circuit breaker arrangement according to claim 2, wherein, The accessory device (7) includes a first accessory (71) and a second accessory (72) located on both sides of the operating mechanism (2); The first accessory wire (711) leading out from the first accessory (71) is directly connected to the electronic trip unit (6); the second accessory wire (721) leading out from the second accessory (72) is directly connected to the electronic trip unit (6); The electromagnetic trip unit (8) is located on the rear side of the first accessory (71); the trip unit wire (81) is guided by a slot at the second accessory (72); After the current transformer wire (91) passes through the current transformer hole (122) opened on the housing (1), it is guided by the slot at the second accessory (72).
4. The arrangement for a three-pole molded case circuit breaker of claim 2, wherein, The housing (1) has a knocking hole on its side wall corresponding to the position of the accessory device (7), and the accessory wire passes through the knocking hole.
5. The arrangement for a three-pole molded case circuit breaker of claim 1, wherein, The housing (1) is also provided with a buckle (121); The buckle (121) is located on the rear side of the operating mechanism (2); The trip unit wire (81) is limited by a buckle (121); The current transformer wire (91) is limited by a buckle (121).
6. A layout structure for a four-pole molded case circuit breaker, wherein the molded case circuit breaker includes a housing (1), an operating mechanism (2), a moving contact (3), a stationary contact (4), an arc-extinguishing chamber (5), an electronic trip unit (6), an electromagnetic trip unit (8), and a current transformer (9); The housing (1) is a four-pole structure, and the operating mechanism (2) is movably mounted on the housing (1); The stationary contact (4) is fixedly assembled at the bottom inside the housing (1), the moving contact (3) is movably assembled on the housing (1) and the moving contact (3) is connected to the operating mechanism (2) in a transmission manner, and the arc-extinguishing chamber (5) is fixedly assembled inside the housing (1) and the arc-extinguishing chamber (5) surrounds the contact end of the moving contact (3). The electronic trip unit (6), the electromagnetic trip unit (8), and the current transformer (9) are respectively disposed on the housing (1); Its features are, The moving contact (3), the stationary contact (4), and the arc-extinguishing chamber (5) are arranged in an L-shape; The operating mechanism (2) is located above the transmission end of the moving contact (3), and the electronic trip unit (6) is located above the arc-extinguishing chamber (5) and in front of the operating mechanism (2). The electromagnetic trip unit (8) is located on the side of the operating mechanism (2). The trip unit wire (81) led out from the electromagnetic trip unit (8) passes through the rear side of the operating mechanism (2) and is connected to the electronic trip unit (6) from the other side of the operating mechanism (2). The current transformer (9) is located below the operating mechanism (2) and behind the moving contact (3). The current transformer wire (91) led out from the current transformer (9) is connected to the electronic trip unit (6).
7. A quad molded case circuit breaker arrangement according to claim 6 wherein, The molded case circuit breaker also includes accessory devices (7); The accessory device (7) is disposed on the side of the operating mechanism (2), and the accessory device (7) is located between the electronic trip unit (6) and the electromagnetic trip unit (8); The accessory wires leading out from the accessory device (7) are directly connected to the electronic trip unit (6); The trip cable (81) is guided by a slot on the accessory device (7); The transformer wire (91) is guided by a slot on the accessory device (7).
8. A molded case circuit breaker arrangement according to claim 7, wherein, The accessory device (7) includes a first accessory (71), a second accessory (72) and a third accessory (73) located on both sides of the operating mechanism (2); The first accessory wire (711) leading out from the first accessory (71) is directly connected to the electronic trip unit (6); the second accessory wire (721) leading out from the second accessory (72) is directly connected to the electronic trip unit (6); the third accessory wire (731) leading out from the third accessory (73) is directly connected to the electronic trip unit (6); The electromagnetic trip unit (8) is located on the rear side of the first accessory (71); the trip unit wire (81) is guided at the second accessory (72) through the second slot (722) opened on the second accessory (72); After the current transformer wire (91) passes through the current transformer hole (122) opened on the housing (1), it is guided at the second accessory (72) by the second slot (722) opened on the second accessory (72), and at the third accessory (73) by the third slot (732) opened on the third accessory (73).
9. The quad molded case circuit breaker layout of claim 7, wherein, The housing (1) has a knocking hole on its side wall corresponding to the position of the accessory device (7), and the accessory wire passes through the knocking hole.
10. The quad molded case circuit breaker layout of claim 6, wherein, The housing (1) is also provided with a buckle (121); The buckle (121) is located on the rear side of the operating mechanism (2); The trip unit wire (81) is limited by a buckle (121); The current transformer wire (91) is limited by a buckle (121).