Miniature circuit breaker with ultra-high short circuit breaking capacity

Abstract

The invention discloses a miniature circuit breaker with ultra-high short circuit breaking capacity, which comprises a circuit breaker case. An arc extinguishing chamber is installed on the left side of the bottom of the inner cavity of the circuit breaker case. A magnetic conducting sheet is installed on the right side of the bottom of the inner cavity of the circuit breaker case. An electromagnetic tripping mechanism is installed on the top of the left side of the inner cavity of the circuit breaker case. The electromagnetic tripping mechanism includes a static contact, an iron core spring, a moving iron core, an electromagnetic coil, a first yoke, a tripping ejector rod and a static contact point. Through the cooperation of a current limiting mechanism, the electromagnetic tripping mechanism, a handle spring, a U-shaped connecting rod, a moving contact mechanism, a thermal element arc guiding mechanism, an adjusting screw nut, the magnetic conducting sheet, the arc extinguishing chamber, the circuit breaker case and a handle, the problem as follows is solved: the existing miniature circuit breaker does not have the function of explosion prevention when used, the moving and static contacts of the miniature circuit breaker will usually be melt at high temperature caused by arc, the air inside the product expands instantaneously under the action of high temperature, and product explosion is thus caused.

Description

technical field [0001] The invention relates to the technical field of miniature circuit breakers, in particular to a miniature circuit breaker with ultra-high short-circuit breaking capacity. Background technique [0002] Miniature circuit breakers, also known as miniature circuit breakers, are mainly used in various places such as industry, commerce, high-rise buildings and residential buildings. [0003] Currently on the market, the German Admiralty Muller L7-63 series miniature circuit breaker has a rated operating short-circuit breaking capacity of 10KA. After L7-63 was introduced into domestic production, due to factors such as production technology and assembly technology, the manufacturer’s rated operating short-circuit breaking capacity is 6A~ The rated operating short-circuit breaking capacity of the 25A product is 10KA, and the 32A~63A can only achieve 6KA. The L7-63 series designed by this patent is not restricted by factors such as production technology and asse...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a small circuit breaker with ultra-high short-circuit breaking capacity, which has the advantage of preventing product bursting, and solves the problem that the existing small circuit breakers do not have the function of preventing bursting when used, and are often small The dynamic and static contacts of the circuit breaker will melt under the high temperature generated by the arc, and the air inside the product will expand instantly under the action of high temperature, leading to the problem of product bursting

Images