Miniature circuit breaker

Abstract

Disclosed is a miniature circuit breaker. The miniature circuit breaker mainly overcomes the defects of existing miniature circuit breakers that the structure of a tripping mechanism is complicated, requirements for the assembly technique are high, reliability is low, productive efficiency is low, and due to the facts that restoration is achieved through tension springs mostly and restoration inaccuracy is caused easily after the tension springs are used for a long time, the service life of the circuit breakers is affected. The miniature circuit breaker is characterized in that a hinging column is sleeved with a latch torsion spring, the two ends of the latch torsion spring abut against a jump pin and a latch respectively, a moving contact hinging shaft is sleeved with a moving contact torsion spring, the two ends of the moving contact torsion spring abut against a moving contact and a support respectively, the hinging column is further sleeved with a support torsion spring which is arranged on the back portion of the support, and the two ends of the support torsion spring abut against the support and the inner wall of a shell. According to the miniature circuit breaker, the torsion springs are arranged between the jump pin and the latch, between the moving contact and the support and between the support and the inner wall of the shell for restoration, restoration is accurate, deviation is avoided, and the service life of the circuit breaker is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of circuit breakers, in particular to small circuit breakers. Background technique [0002] The miniature circuit breaker has the characteristics of advanced structure, reliable performance, strong breaking capacity, beautiful and compact appearance, etc. It is used for the overload and short circuit protection of lighting, distribution lines and equipment in office buildings, residential buildings and similar buildings, and can also be used as a It is used for infrequent on-off operation and conversion of lines, mainly used in various places such as industry, commerce, high-rise buildings, and residential buildings. Most of the tripping mechanisms in current small circuit breakers use extension springs to achieve reset. After a long time, it is easy to reset inaccurately, which will affect the service life of the circuit breaker. Contents of the invention [0003] In order to overcome the deficiencies of the backg...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a miniature circuit breaker, which mainly solves the shortcomings of the tripping mechanism in the current miniature circuit breaker, such as complex structure, high assembly process requirements, poor reliability, and low production efficiency. To achieve reset, however, the tension spring is prone to inaccurate reset after a long time of use, which will affect the service life of the circuit breaker.

Images