Miniature circuit breaker current limiter

Abstract

The invention provides a miniature circuit breaker current limiter. An electric repulsion mechanism of the miniature circuit breaker current limiter comprises a static contact and a moving contact which have opposite current direction, are parallel to each other and contact mutually. The separation and reunion of the static contact and the moving contact are controlled by an operating system comprising a toggle type connection rod lock catch of an energy storage device, the moving contact is electrically connected with the current coil of a hydraulic electromagnetic release, the operating system and the hydraulic electromagnetic release share the toggle type connection rod lock catch, and the hydraulic electromagnetic release pushes the toggle type connection rod lock catch to unlock to make the circuit breaker break. Preferentially, the static contact is provided with a magnetic iron sheet and an arc guide plate; the moving contact is provided with an arc angle, the toggle type connection rod lock catch comprises a tripper, a lock catch, a connection plate, a support piece and a pull rod, or the toggle type connection rod lock catch comprises a connection rod, a toggle, a mandril, a support piece and a pull rod, and the hydraulic electromagnetic release comprises a support, a pole shoe, an armature and an oil damper. The miniature circuit breaker current limiter has the advantages of unique design, simple structure, rapid action, strong circuit breaking capacity, good stability, safety and energy saving, thereby being suitable for large-scale popularization and application.

Description

Technical field [0001] The present invention relates to the technical field of circuit control, in particular to the technical field of circuit breakers, and more specifically to a current limiting device for small circuit breakers. Background technique [0002] The existing miniature circuit breakers have been widely used in buildings and residential distribution boxes as the overload and short circuit protection of electrical circuits. However, the overload protection of these circuit breakers uses bimetallic thermal elements and the short-circuit current protection uses electromagnetic trippers. This is because the bimetallic thermal element causes the bimetallic sheet to overheat and bend excessively during the short-circuit current. After the fault is eliminated, the bimetallic sheet will not return to the original position, which will change the breaking characteristics, in order to change the traditional tripping In 1957, ABB company invented the "current-limiting" miniat...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned background technology, the hydraulic electromagnetic structure of this type of equipment circuit breaker has limited short-circuit breaking capacity.

Images