L&T BG404010, 40A 100mA 4 Pole RCCB is an electrical component known as a Residual Current Circuit Breaker (RCCB). Let me break down the specifications for you:
RCCBs are important safety devices used in electrical installations to quickly disconnect a circuit when it detects that the electrical current is not balanced between the phase and the neutral conductors. This imbalance can occur in the case of a leakage current, which might be due to a fault in the circuit or an accidental contact with a live wire. By tripping the circuit when such an imbalance is detected, the RCCB helps prevent electric shock or fire hazards.