The Siemens SENTRON 5SU1654-1RC40 is a combined residual current circuit breaker with overcurrent protection (RCBO) rated at 40 A with a C tripping characteristic and 300 mA Type AC residual current sensitivity. It occupies 2 modular width units (36 mm wide) on a DIN rail, with a 70 mm installation depth, fitting standard distribution board cutouts. The 1P+N design switches the line and monitors the neutral, intended for 50 Hz AC single-phase circuits at 230 V nominal.
This RCBO carries a 10 kA rated short-circuit capacity per EN 60898 and a 15 kA rating per IEC 60947-2. The higher IEC rating means it can be used in industrial distribution where prospective fault current exceeds 10 kA, provided the installation is coordinated per IEC 60947-2.
The 36 mm width (2 MW) and 70 mm depth are standard for SENTRON RCBOs — no overshoot beyond the enclosure base. Ambient range spans -40 °C to 75 °C, with derating applicable above 40 °C for continuous load.