1SYF204015R2250

The ABB 1SYF204015R2250 (FB204 AC-25/0.1) is a 4-pole (3-phase and neutral) Residual Current Circuit Breaker (RCCB) from the FB200 series, designed to protect multi-phase electrical networks against earth fault currents. Featuring a $100text{ mA}$ ($0.1text{ A}$) residual operating sensitivity, it functions efficiently as a sub-main and upstream fire-protection device, mitigating fire risks caused by persistent insulation breakdown. Built in compliance with IEC 61008 and IS 12640-1 standards, it is widely integrated into commercial, industrial, and heavy residential distribution switchboards.