Control and protection device of low-voltage apparatus

Abstract

The invention discloses a control and protection device of a low-voltage apparatus. The control and protection device of the low-voltage apparatus comprises a base and a control and protection module which is arranged on the base in a pluggable mode and interchangeable. The base comprises a base seat and a housing, and the inside of the base is provided with a moving contact, a fixed contact and a main loop current conductor; a control electromagnet and an operation mechanism which control and maintain the contact and the separation of the fixed contact and the moving contact according to control signals; a manual operation knob which provides the control signals of controlling the contact and the separation of the fixed contact and the moving contact; a control contact which is connected to the manual operation knob; and a current sensor which is used for detecting the current flowing through the main loop current conductor to generate sensing signals. The inside of the control and protection module is provided with a signal processing unit which controls the status of the control electromagnet through an electric circuit according to the sensing signals; and a tripping device which responds to the signal processing unit to control the actions of the operation mechanism through a mechanical connection mode.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, and more specifically, relates to a control and protection device for low-voltage electrical appliances. Background technique [0002] Circuit breakers can be used for infrequent switching of lines and infrequent starting of motors. It is used to distribute electric energy in the power distribution network, and is used for overload, short circuit and undervoltage protection of lines and power supply equipment. It can also be used for infrequent starting and breaking during operation of the motor, as well as overload, short circuit and undervoltage protection. Contactors can be used to frequently switch on and off circuits and to switch on, break and carry specified overload currents. Contactors generally have the capability of frequent operation and high electromechanical life. [0003] The control and protection of electrical equipment can generally be realized throu...

AI Technical Summary

Problems solved by technology

In addition, the main contact is controlled by the electromagnet, and the switching device with the function of a contactor and a circuit breaker, because the electromagnet cannot meet the requirements of quickly breaking the main contact when it functions as a circuit breaker, so its protection range is limited and cannot reach the circuit breaker. high breaking performance

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