The Schneider Electric Acti 9 Vigi C120 4P 30mA is a 4-pole (3P+N), 30mA sensitivity Residual Current Device (RCD/RCCB) from the premium C120 series. It is a pure earth leakage protection device designed to be installed in series with circuit breakers (MCBs/MCCBs) to provide protection against electric shock and fire risks caused by insulation faults in three-phase electrical installations.