What is a circuit breaker used for?

‌Circuit breakers play a vital role in the power system. Through their rapid response and automatic disconnection functions, they effectively protect electrical equipment and personal safety, and at the same time achieve the reasonable distribution of electric energy and effective control of circuits.

The main functions of circuit breakers include protecting electrical equipment, ensuring the safety of electricity use, distributing electric energy, and controlling circuits. ‌

A circuit breaker is a switching device that can close, carry and disconnect the current under normal circuit conditions, and close, carry and disconnect the current under abnormal circuit conditions within a specified time. Its main functions and characteristics are as follows:

Protecting electrical equipment and ensuring the safety of electricity use: Circuit breakers can cut off the current in time when abnormal conditions such as short circuits and overloads occur in the circuit, avoiding dangers such as overload damage to equipment and fire. At the same time, it can also provide grounding protection to prevent the housing of electrical equipment from being connected to the electrical part, avoiding personal electric shock accidents. ‌

Distributing electric energy and controlling circuits: Circuit breakers can distribute electric energy efficiently and quickly, avoiding frequent starting of asynchronous motors. It can also protect the motor and power line. When the motor and power line are seriously overloaded or short-circuited, it can automatically cut off the circuit to ensure the safe use of electrical equipment. In addition, the circuit breaker can also divide the circuit into several parts as needed to achieve segmented control of multiple electrical equipment. When a fault occurs, only the problematic part of the circuit is cut off without affecting the normal use of other parts.

Improve the safety and efficiency of the system: The circuit breakers in some high-voltage power systems support remote control, which can operate and protect the circuit through remote control, improving the safety and efficiency of the system.