Views: 0 Author: Site Editor Publish Time: 2022-08-02 Origin: Site
A Miniature circuit breaker refers to mechanical switchgear capable of connecting, conducting and interrupting current under normal circuit conditions and of producing, conducting and interrupting current for a specified period of time even under certain abnormal circuit conditions.
What is the basic structure of a Miniature circuit breaker?
How to choose a Miniature circuit breaker?
What is the difference between a Miniature circuit breaker and a Molded case circuit breaker?
Miniature circuit breakers consist of drives, contacts, protective devices (various triggers) and arc extinguishing systems. Its main contacts are manually operated or electrically closed. After the main contact is closed, the free release mechanism locks the main contact in the closed position. The coil of the overcurrent trigger and the thermocouple of the thermal trigger are connected in series with the main circuit, and the coil of the undervoltage trigger is connected in parallel with the power supply. In case of short circuit or strong overload of the circuit, the anchor of the overcurrent trigger is tightened to release the free trigger and the main contact disconnects the main circuit. When the circuit is overloaded, the thermocouple of the thermal trigger heats up and bends the bimetal, causing the free release mechanism to act. In case of undervoltage in the circuit, the anchor of the undervoltage trigger falls off.
In the construction of civil buildings, Miniature circuit breakers are mainly used to protect and operate overload, short circuit, overcurrent, voltage loss, undervoltage, grounding, leakage, automatic switching of two power sources and rare starting of motors. Principles In addition to complying with basic principles such as the characteristics of the operating environment of low voltage electrical equipment (see Industrial and Civil Power Distribution Design Manual), the following conditions should be considered:
1) The rated voltage of the Miniature circuit breaker should not be less than the rated voltage of the line;
2) The rated current of the Miniature circuit breaker and the rated current of the overcurrent trigger are not less than the calculated current of the line;
3) The rated short-circuit switching capacity of the Miniature circuit breaker is not less than the maximum short-circuit current in the line.
Both Miniature circuit breakers and Molded case circuit breakers belong to the Miniature circuit breakers and work according to the same principle.
The difference is:
1. The installation method of the Miniature circuit breaker is the rail installation, and the Molded case circuit breaker is the screw installation.
2. The maximum current of the Miniature circuit breaker is within 63 A, and the current of the Molded case circuit breaker is up to 2000 A.
After understanding the different types of Miniature circuit breakers, choosing the right connector also requires choosing the quality. As a Chinese pioneer in Miniature circuit breakers, Zhejiang Shilong Electric Technology Co., Ltd. will do its best to ensure the quality of the connectors and after-sales service.
