Contact system of plastic case breaker

Abstract

The invention discloses a contact system of a low-voltage switch device, such as, a circuit breaker, the contact system utilizes the principle of combining the electromagnetic repulsive force and thegas pressure, a structure with a moving contact and a static contact which can simultaneously swing and be repulsed and an automatic magnetic blow-out system, thus being able to accelerate the breaking speed between the moving contact and the static contact, widen the repulsion distance between the moving contact and the static contact, accelerate the arc extinguishment and further enhance the performance indicators for rapid flow limit and arc extinguishment. The contact system of the invention has compact structure, small volume and low production cost.

Description

technical field [0001] The invention relates to a contact system of a low-voltage switch, in particular to a contact system of a molded case circuit breaker with fast current limiting and arc extinguishing performance. Background technique [0002] The contact system is an essential and important part of low-voltage switchgear. Its current limiting performance and arc extinguishing performance are important performance indicators of switchgear, especially in circuit breakers. The requirements for this indicator are more prominent, and to improve this The key is to speed up the breaking speed of the dynamic and static contacts, increase the opening distance of the dynamic and static contacts, and improve the arc extinguishing efficiency of the arc extinguishing system. [0003] The common current-limiting contact system is the static contact repulsive type. When the short-circuit current passes, the opening of the moving contact can be accelerated under the action of electrom...

AI Technical Summary

Problems solved by technology

When the two current intensities are unequal or distributed asymmetrically with the swing track surface of the moving contact, the two vertical component forces cannot be offset, and the resultant force between them will slow down the breaking speed of the moving contact

In actual production and manufacturing, in order to reduce the influence of the vertical component force on the breaking speed of the moving contact, the processing accuracy of the parts and the assembly accuracy of the parts have to be improved, so that the manufacturing difficulty and production cost of the product have to be increased

[0009] The third is to reduce the impact damage to product parts caused by long arc burning time, large arc energy and high gas pressure in the product shell. The existing contact system has complex structure, large volume and high production cost. high

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