Circuit breaker

Abstract

The invention discloses a circuit breaker which comprises a knife switch piece, a fixed clamping plate and a movable clamping plate capable of being matched to clamp the knife switch piece and a baffle arranged on the outer sides of the fixed clamping plate and the movable clamping plate. The circuit breaker further comprises a compression spring arranged between the baffle and the movable clamping plate, and two ends of the compression spring respectively abut against the baffle and the movable clamping plate. According to the circuit breaker, the knife switch piece and the movable clamping plate adopt the spring compression mode to improve the mode in the prior structure that the movable clamping plate presses the knife switch piece only by self elasticity, and enables extrusion force of the movable clamping plate to the knife switch piece to be remarkably increased, namely the movable clamping plate can still ensure connection firmness between the knife switch piece and the movable clamping plate when anti-fatigue performance of the movable clamping plate is reduced. The circuit breaker improves working reliability and prolongs service.

Description

technical field [0001] The present invention relates to the technical field of electric appliance control, and more specifically, relates to a circuit breaker. Background technique [0002] Circuit breakers are on-off switches that control electrical circuits, and are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Among them, the high-voltage circuit breaker (or high-voltage switch) can not only cut off or close the no-load current and load current in the high-voltage circuit, but also protect the electrical equipment when the system fails, and cut off the excessive current in the circuit. load current and short circuit current. It has a relatively complete arc extinguishing structure and sufficient current breaking capacity, which provides a guarantee for the safe transmission and use of high-voltage current. [0003] In the prior art, the high-voltage DC circuit breaker mainly includes a bottom plate, a porcel...

AI Technical Summary

Problems solved by technology

However, after the circuit breaker has been used for a long period of time, after repeated closing and opening operations, the fatigue resistance of the fixed splint and the movable splint will inevitably be more or less weakened, causing the gate blade to be damaged. The intensity of the extrusion force is reduced. Once the extrusion force is insufficient and the gate blade is fixed between the fixed splint and the movable splint, the circuit will be disconnected, which will have a greater impact on the safe transmission and use of high-voltage current.

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