The Siemens 3RV1041-4FA15 is a SIRIUS motor protection circuit breaker rated for 40 A continuous current with a CLASS 10 trip characteristic, sized for a 18.5 kW motor at 400 V AC. Its 50 kA breaking capacity at 400 V AC means it can safely interrupt a bolted fault at the motor terminals without upstream fuses needing to clear — a key spec for panel SCCR compliance under IEC 60947-2.
Snap-on mounting onto 35 mm DIN rail per EN 50022, with screw-type terminals for the main circuit accepting up to 50 mm² stranded (2x) or 70 mm² single conductor. The 70 mm width and 165 mm height fit a standard DIN rail slot; the 174 mm depth leaves clearance behind an enclosure backplate. Auxiliary switch terminals accept 0.5 to 2.5 mm² solid or stranded — consistent with control wiring practice.
Rated for operation from -20 to +60 °C, storage from -50 to +80 °C — suitable for unheated enclosure installations in temperate climates. Shock rated at 25 g / 11 ms, so it holds calibration on machine-tool panels subject to intermittent vibration. RoHS compliance date of 2006-07-01 meets the original substance restrictions.