Similar to the previous response, an Earth Leakage Circuit Breaker (ELCB) or Residual Current Circuit Breaker (RCCB) is designed to protect against electric shock by detecting and interrupting current leakage to the ground.
The ELCB monitors the current imbalance between the live and neutral wires and quickly disconnects the circuit if a fault is detected.
The "2 pole" designation means that this ELCB model is designed for single-phase electrical systems. It monitors the current in both the live (L) and neutral (N) wires.