Breaker

Abstract

A breaker comprises a tripping fastening piece, a locking fastener, a refastening piece and a rocking arm. The rocking arm is provided with two main springs and a handle, the tripping fastening pieceand the refastening piece are overlapped and cooperated with the locking fastener, the refastening piece is cooperated with a release mechanism, the tripping fastening piece and the main springs are connected with connection rods, the connection rods are connected with a moving contact module, the refastening piece and the locking fastener are unlocked to trigger unlocking of the locking fastenerand the tripping fastening piece, reaction springs connected with the tripping fastening piece are arranged on a support, the action force directions of the reaction springs are the same as the unlocking direction of the tripping fastening piece. The reaction springs with the action force directions being the same as the unlocking direction of the tripping fastening piece are arranged so that thestructure is simple and the overlapping is convenient, the breaker and the tripping fastening piece can be rapidly unlocked, and the release speed of an operation mechanism is improved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker. Background technique [0002] The circuit breaker is used in the power distribution network to connect, break and carry the normal working current, and can cut off the power supply in the event of overload, short circuit, undervoltage and ground fault in the circuit or electrical equipment, and protect the circuit or utility. Electrical equipment is not damaged. Among them, the short-circuit fault is the most serious. Once a short-circuit overcurrent occurs, if the over-current protection device of the circuit breaker fails to quickly cut off the power supply in time, it will bring huge harm and loss to personal safety and property economy, and it will also damage the circuit breaker itself. cause damage. [0003] The operating mechanism of the existing circuit breaker is usually powered by the energy storage mechanism to provide tripping powe...

AI Technical Summary

Problems solved by technology

Among them, the short-circuit fault is the most serious. Once a short-circuit overcurrent occurs, if the over-current protection device of the circuit breaker fails to quickly cut off the power supply in time, it will bring huge harm and loss to personal safety and property economy, and it will also damage the circuit breaker itself. cause damage

[0003] The operating mechanism of the existing circuit breaker is usually powered by the energy storage mechanism to provide tripping power. By increasing the force value of the main energy mechanism, although the tripping speed can be increased to a certain extent, the energy of the short-circuit current can be reduced, and the molded case circuit breaker can be reduced. The damage of its own makes it work more reliably, but it aggravates the fatigue loss of other components (such as handles, connecting rods, etc.) and the energy storage mechanism itself, thereby reducing the service life of the molded case circuit breaker The opening and closing force of the case circuit breaker affects the operating feel

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