Operation device of miniature multi-pole circuit breaker

Abstract

The invention discloses an operation device of a miniature multi-pole circuit breaker. The operation device comprises a handle, a rotary plate mounted on a housing in a pivoting manner by a mandrel, two pairs of contacts capable of performing closing / breaking matching, two electromagnetic tripping devices arranged side by side, and two thermal tripping devices arranged side by side, wherein a tripping connecting rod provided with a lock hook is mounted on the rotary plate in a pivoting manner by a first twisting shaft; a lock tooth, a control element capable of being matched with the electromagnetic tripping devices of the adjacent two-pole circuit breaker, and an actuating rod capable of being matched with bimetallic strips of the thermal tripping devices of the adjacent two-pole circuit breaker are arranged on a tripping rod which is mounted on the rotary plate in a pivoting manner by a second twisting shaft; the two ends of a U-shaped rod are connected with the handle and a hinge of the tripping connecting rod respectively; two short-circuit short columns arranged on the control element side by side are matched with actuating ejection rods of the two electromagnetic tripping devices in a triggering manner respectively; and two overload short columns arranged on the actuating rod side by side are matched with the bimetallic strips of the two thermal tripping devices in a triggering manner respectively. The tripping rod can be controlled by the two adjacent groups of independent tripping devices; and the operation device is small in size, compact in structure and more reliable in motion.

Description

technical field [0001] The present invention relates to a low-voltage miniature circuit breaker, in particular to an operating device for a miniature circuit breaker, in particular to an operating device for a multi-pole miniature circuit breaker. A two-pole circuit breaker consisting of a tripping device and an openable contact group associated with an operating device may also be a multi-pole circuit breaker that is coordinated by two or more operating devices. Background technique [0002] General low-voltage circuit breakers, especially the operating mechanism of terminal miniature circuit breakers, have modular standard requirements for their dimensions, and also require short-circuit protection and overload protection functions. In addition, there are often requirements for residual current action protection. For this reason , most of the existing multi-pole miniature circuit breakers adopt an assembled structure, and a plurality of single-pole miniature circuit breake...

AI Technical Summary

Problems solved by technology

If the above-mentioned operating mechanism technology is used, two operating mechanisms need to be arranged in parallel for a two-pole circuit breaker, and multiple operating mechanisms should be arranged in parallel for a multi-pole circuit breaker. Obviously, the increasingly urgent requirements for miniaturization and high breaking capacity of circuit breakers cannot be realized.

However, if two poles share one operating device, that is, one operating device controls the closing / breaking of the moving contacts and static contacts of the two poles, it can obviously reduce the size of the circuit breaker product, but the existing multi-pole or single-pole small Under the constraints of modularization standards, the circuit breaker has a very compact structure, and the following technical problems need to be solved in the already crowded internal space: First, the operating device must synchronously control the two moving contacts and the two static contacts respectively. Closing / breaking, and the contact pressure between the two moving contacts and the two static contacts is equal; the second is that the operating device must be mechanically coupled with the two electromagnetic tripping devices, and the tripping of any one of the electromagnetic tripping devices The action can reliably cause the operating device to trip and trip; the third is that the operating device must be mechanically coupled with the two thermal trip devices, and the tripping action of any one of the thermal trip devices can reliably cause the operating device to trip and trip

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