Circuit breakers not only provide basic overload and short-circuit protection, but can also achieve more complex protection functions through additional modules:
Residual Current Protection: Detects residual current in the circuit using an RCD (Residual Current Device) module to prevent electric shock accidents caused by leakage;
Ground Fault Protection: Identifies and disconnects ground fault circuits;
Voltage Protection: Such as undervoltage and overvoltage protection to prevent equipment from operating under abnormal voltage conditions;
Remote Control: Some circuit breakers support PLC linkage or remote opening and closing operations.
In addition, some electronically tripped circuit breakers can precisely set the operating current and response time, suitable for precision instruments or automated control systems requiring high-precision protection.
Circuit Breaker Protection Functions
Circuit breakers have relatively simple functions, mainly used for overload and short-circuit protection:
Overload Protection: Utilizes a thermal element to sense the current magnitude; when the current exceeds the rated value for a certain period, it triggers a trip;
Short Circuit Protection: Induces a large instantaneous current through an electromagnetic coil to quickly disconnect the circuit.
Because their tripping threshold is a fixed range (e.g., Type C circuit breakers are suitable for lighting loads with small inrush currents, while Type D circuit breakers are suitable for loads with large inrush currents such as motors), their protection accuracy is low and they are not suitable for applications sensitive to current fluctuations.
