Residual current device (RCD): Under normal operating conditions, the load is switched on and the current is interrupted; when the residual current of the circuit reaches its specified value under the specified conditions, a contact is caused to act and a main circuit is disconnected. protector. The residual current device may be a combination of various components that detect the residual current and turn the main circuit current on and off.
Electrical equipment will exhibit abnormal current and voltage signals when it is leaking. The leakage protection device detects this abnormal current or abnormal voltage signal, and after signal processing, causes the actuator to act, and rapidly cuts off the power supply by means of the switchgear. Leakage protection is performed. The leakage protection device operating according to the fault current is a current leakage protection device, according to the fault voltage. Action is voltage type leakage protection device. Electronic RCDs are commonly used in China, and electromagnetic RCDs are commonly used abroad.