The Schneider Electric ESIIM2 40 3P+N is a 40A, 4-pole (3P+N) Residual Current Circuit Breaker with Overcurrent Protection (RCBO) from the Multi 9 series. It combines miniature circuit breaker (MCB) functions and earth leakage protection in a single device, designed for final circuit protection in residential, commercial, and light industrial three-phase installations.