2CSF202005R3900

The ABB 2CSF202005R3900 (F202 AC-100/0.3) is a heavy-duty, high-current 2-pole Residual Current Circuit Breaker (RCCB) from the premium F200 series. Engineered to protect large-scale residential, commercial, and industrial sub-main or main distribution networks against earth fault currents, it features a $300text{ mA}$ ($0.3text{ A}$) residual operating sensitivity tailored specifically for fire protection and selective upstream segregation, preventing persistent insulation faults from developing into fire hazards. Built in strict compliance with IEC/EN 61008 standards, it is heavily relied upon in demanding switchboard installations.