Actuator for low voltage circuit breaker

Abstract

The invention discloses an execution mechanism of a low-voltage circuit breaker. The execution mechanism comprises a base, a tripping mechanism and a reset mechanism, wherein the base is of a hollow cavity structure; the tripping mechanism is arranged in a cavity; the tripping mechanism comprises a power assisting plate, an energy storage spring, a push plate and a lock plate; the energy storage spring is connected with the power assisting plate; one end of the push plate is connected with a flux transformer; the reset mechanism comprises a reset bracket, a reset seat and a reset seat assembly; the reset seat is provided with a hollow cavity; the reset seat assembly comprises a flux top block, a reset pressure spring and a reset seat; and the reset pressure spring and the flux top block are arranged in the hollow cavity of the reset seat. The execution mechanism is capable of achieving fast tripping and resetting; and the fast tripping mechanism is capable of increasing the motion speed of the push plate of the execution mechanism, so that the tripping time of the circuit breaker is shortened, lateral force component to a flux top rod is reduced by the reset mechanism, a coating on the flux top rod is not damaged after the flux transformer moves for multiple times and the life of the flux transformer is prolonged.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical equipment, in particular to an actuator of a low-voltage circuit breaker. Background technique [0002] Low-voltage circuit breakers are also called automatic air switches or automatic air circuit breakers, or circuit breakers for short. It is an electrical appliance that has both manual switching functions and automatic voltage loss, undervoltage, overload, and short circuit protection. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power supply lines and motors, etc., and automatically cut off the circuit when they have serious overload or short-circuit and under-voltage faults. Its function is equivalent to a fuse switch and Overheating relay and other combinations. Moreover, it is generally not necessary to change parts after breaking the fault current, and it has been widely used. [0003] A low-voltage circuit breaker is a larg...

AI Technical Summary

Problems solved by technology

[0004] The executive mechanism of the existing circuit breaker does not have a quick release mechanism, and the push plate of the actuator can only move under the push of the magnetic flux converter, thereby driving the circuit breaker to open. This process takes a long time to trip, which is not conducive to the Breaking in case of short circuit

[0005] The magnetic flux reset mechanism of the existing circuit breaker actuator is a reset jack block that rotates, thereby driving the flux jack to move to reset the flux converter. After multiple movements of this structure, the coating of the flux jack is easily damaged, and the jack The rod is prone to rust and surface roughness increase, causing the magnetic flux converter to be stuck and unable to drive the circuit breaker to open, so that when a short circuit fault occurs, the circuit will be burned

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