Current limiting type low-overvoltage low-voltage circuit breaker

Abstract

The invention relates to a current limiting type low-overvoltage low-voltage circuit breaker. The circuit breaker comprises a moving contact, a static contact, a static conductive rod, a moving conductive rod, an insulation connection rod and an operation mechanism. The operation mechanism is connected with the moving conductive rod through the insulation connection rod. The moving contact connected with the lower part of the moving conductive rod directly faces the static contact. The circuit breaker also comprises a conductive spring. The static contact is connected with the static conductive rod by the conductive spring. Due to the structure of the conductive spring, a separating brake is characterized in that the length of electric arcs is gradually increased. By stretching the electric arcs, the voltage of the electric arcs is increased to achieve current limiting effects. Before the quenching of the electric arcs, the electric arcs can be shortened so as to reduce the voltage ofthe electric arcs, and the electric arcs is allowed to be free from overvoltage to damage insulation of other protected devices. Problems are avoided that structures of other dual operation mechanismsare complex and the journeys are increased rather than reduced along with the time. The circuit breaker has the current limiting effects and will not generate overvoltage.

Description

technical field [0001] The invention relates to an electrical device, in particular to a current-limiting low-overvoltage low-voltage circuit breaker. Background technique [0002] A low voltage circuit breaker always creates an arc between two separated contacts when it is opened. Only when the arc is extinguished can the electrical and mechanical separation be truly realized between the two contacts. But extinguishing the arc takes a few tricks. At present, the arc extinguishing methods commonly used in low-voltage electrical appliances include elongating the arc or cooling the arc at the same time, or dividing the arc into short arcs by using the cathode effect of the arc. The purpose of these methods is to increase the voltage of the arc so that the arc cannot exist and extinguish it. When the voltage is too high, the current limiting effect of the arc is too strong, which easily generates overvoltage in the system and damages the insulation of the protected equipment....

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that the arc extinguishing method of the current low-voltage circuit breaker is easy to generate higher voltage, so that the equipment interrupted by the circuit breaker or the equipment to be protected must have a higher insulation level. Over-voltage and low-voltage circuit breakers can not only increase the arc voltage by elongating the arc to achieve the current limiting effect, but also shorten the arc to reduce the arc voltage before the arc is extinguished, so as not to cause the arc to overvoltage and damage the insulation of other protected equipment.

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