LM47LE-63 RCBO 4.5kA

A residual-current device switch (also known as a leakage protection switch) is an electrical safety device which has the functions of overload, short circuit protection and leakage protection, the core function is to quickly cut off the power supply (usually within 0.1 seconds) when there is an electric shock or leakage fault in the circuit (such as accidental conduction between the phase line and the earth) , so as to avoid electric shock casualties or electrical fire accidents, widely used in home, commercial and industrial low-voltage power distribution systems

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Residual current transformer (RCT) : set on all phase line (L) and neutral line (N) , in normal operation, phase line current and neutral line current are equal in size and opposite in direction, transformer secondary coil no induced current output;
Electronic amplification and judgment circuit: when leakage occurs (such as human body contact phase line) , part of the current flows into the earth through the human body, resulting in the phase line and neutral line current“Difference”(that is, residual current) , the secondary coil of the transformer generates an induction signal, which is amplified by the circuit to trigger the release;
Electromagnetic/electric release: after receiving the trigger signal, quickly push the mechanical mechanism to disconnect the main contact, cut off the circuit, and realize protection.