1SYF204015R3400

The ABB 1SYF204015R3400 (FB204 AC-40/0.3) is a 4-pole Residual Current Circuit Breaker (RCCB) from the FB200 series, engineered to protect three-phase and neutral electrical networks against earth fault currents. Featuring a $300text{ mA}$ ($0.3text{ A}$) residual operating sensitivity, it is tailored specifically for upstream fire protection and sub-main or feeder segregation, effectively preventing persistent insulation faults from developing into fire hazards. Built in strict compliance with IEC 61008 and IS 12640-1 standards, it is widely utilized across commercial, industrial, and heavy multi-phase distribution switchboards.