带分闸限位机构的塑壳式断路器
By introducing a tripping limit mechanism into a molded case circuit breaker, and using the contact part and the limit part to indicate the welding status of the moving and stationary contacts, the problem of mis-indication of the handle in the prior art is solved, and safe and reliable operation and low-cost contact status identification are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EATON ELECTRIC INC
- Filing Date
- 2025-05-20
- Publication Date
- 2026-07-17
AI Technical Summary
When the moving and stationary contacts of a molded case circuit breaker are welded together, the operating handle cannot accurately indicate the status of the main contacts, which may lead to equipment failure or safety hazards. In addition, the existing method of adding an indicator module increases costs.
Design a tripping limit mechanism, including a contact part and a limit part, which indicates the welding status of the moving and stationary contacts through visual and tactile means, and prevents the handle from rotating to the tripping position. The structure is simple and the cost is low.
It effectively identifies the welding status of contacts, prevents electrical safety accidents, ensures operational reliability, and does not increase manufacturing costs.
Smart Images
Figure CN224519836U_ABST
Abstract
Claims
1. A molded case circuit breaker with a tripping limiting mechanism, comprising a base, an upper cover and a molded case circuit breaker assembly located between the base and the upper cover, wherein, The molded case circuit breaker assembly includes: At least one stationary contact is fixedly mounted to the base and is electrically connected to one of the power supply side and the load side; At least one moving contact that can be rotatably engaged with a stationary contact, which is electrically connected to the other of the power supply side and the load side, thereby being able to switch relative to the stationary contact at least between a closed position and an open position; A rotating spindle, configured to support the moving contact and rotatably drive the moving contact to switch between a closed position and an open position; and Operating mechanism, wherein the operating mechanism includes: Paired side panels; and The operating handle with a rocker arm is pivotally mounted to the pair of side plates and is configured to manually drive the rotating spindle and cause the moving contact to switch relative to the stationary contact at least between the closed position and the open position, and the rocker arm includes a rocker arm pivot portion pivotally connected to the side plate and a rocker arm rod rotatable about the rocker arm pivot portion. And an upper link and a lower link pivotally mounted to a pair of side plates, wherein one end of the lower link is operatively connected to the operating handle and the other end is operatively connected to the moving contact; Its characteristic is that it further includes a tripping limit mechanism, wherein the tripping limit mechanism includes: The contact part located on one side of the rocker arm; and The limiting part located on the outermost side of the upper connecting rod is designed to rotate synchronously with the rocker arm so as not to interact with the contact part when the moving contact is not welded together with the stationary contact; and when the moving contact is welded together with the stationary contact, the limiting part is fixed relative to the rocker arm to limit the rotation of the operating handle to the open position.
2. The molded case circuit breaker with opening limiting mechanism as claimed in claim 1, wherein, The limiting part of the opening limit mechanism is designed as an extended lug protruding from the outermost side of the upper connecting rod.
3. The molded case circuit breaker with opening limiting mechanism as claimed in claim 2, wherein, Either of the contact portion and the limiting portion of the aforementioned tripping limit mechanism that come into contact with each other is designed as an inclined surface.
4. The molded case circuit breaker with opening limiting mechanism as claimed in claim 1, wherein, The operating mechanism further includes: A connecting rod shaft pivotally mounted to a pair of side plates, wherein the connecting rod shaft has connecting rod shaft ends located at both ends, and wherein one end of the lower connecting rod is operatively connected to the connecting rod shaft; An operating mechanism spring is connected to the connecting rod shaft and the rocker arm, wherein the mechanism spring is designed to lift the connecting rod shaft in response to a change in the position of the rocker arm, thereby driving the lower connecting rod and the moving contact to switch from the closed position to the open position.
5. The molded case circuit breaker with opening limiting mechanism as claimed in claim 4, wherein, It also includes a trip latch pivotally mounted to a pair of side plates, capable of operating in response to an overcurrent event, wherein the trip latch includes a pair of arms that are bent at approximately 90 degrees, wherein the arms have a trip latch operating part that is operatively connected to the upper linkage.
6. The molded case circuit breaker with opening limiting mechanism as claimed in claim 4, wherein, The upper link includes an upper part pivotally connected to the jumper and an upper link pivot portion connected to the ends of the link shaft on both sides for force transmission.
7. The molded case circuit breaker with tripping limit mechanism according to claim 4, characterized in that, The molded case circuit breaker further includes: A moving contact bracket, fixedly connected to the rotating spindle, is assigned to each moving contact; The pivot shaft located in the middle of the body of the moving contact; and Cam components located at both ends of the pivot shaft, which are force-transmittingly connected to or shape-fitting the front end of the moving contact bracket.
8. The molded case circuit breaker with opening limiting mechanism as claimed in claim 7, wherein, The lower link includes a lower link pivot portion that is pivotally connected to the moving contact support.
9. The molded case circuit breaker with opening limiting mechanism as claimed in claim 7, wherein, wherein the rocker pivot portion of the rocker arm is arranged at a greater distance from the contact head than the connecting rod shaft end of the connecting rod shaft.
10. The molded case circuit breaker with opening limiting mechanism as claimed in claim 9, wherein, wherein the predetermined distance by which the rocker pivot portion is offset from the connecting rod shaft end of the connecting rod shaft is designed to be not less than 3 mm.