The Siemens SIRIUS 3RV5041-4JA10 is a 3-pole motor protection circuit breaker in the S3 frame size, rated 63 A operational current with a Class 10 trip characteristic. It combines a thermal overload release and a magnetic short-circuit trip in one device, sized for motor branch circuits up to 63 A at 400 V AC-3 duty.
The 63 A AC-3 rating at 400 V is the motor-switching current — it handles full-load current of motors up to roughly 30 kW at 400 V three-phase. Class 10 trip means it lets a motor draw locked-rotor current (typically 6–8× FLA) for up to 10 seconds before tripping, which matches standard induction motor starting profiles on pumps, fans, and compressors. The 20 W typical power loss means the breaker dissipates that heat into the enclosure; in a densely packed panel, account for that when sizing ventilation. The S3 frame is the largest of the SIRIUS motor-protection breaker sizes — 70 mm wide, 174 mm deep, 165 mm tall — so it needs a full 70 mm DIN-rail slot plus clearance: 50 mm above and below, 167 mm forward, 30 mm to the side. That forward clearance is the key dimension for enclosure depth selection.
Main circuit connections are screw-type box terminals on top and bottom, accepting solid or stranded copper: 2×(2.5–16 mm²), 2×(10–50 mm²), or 1×(10–70 mm²). AWG equivalents: 2×(10–1/0) or 1×(10–2/0). Finely stranded wire with ferrule: 2×(2.5–35 mm²) or 1×(2.5–50 mm²). Terminal torque: 4–6 N·m. The breaker provides short-circuit protection (magnetic trip) integrated, so no separate fuse or MCCB is needed upstream for the motor branch — just a backup short-circuit protective device sized per the coordination tables. Environmental range: -20 to +60 °C operating, -50 to +80 °C storage/transport. Humidity tolerance 10–95% RH. Shock resistance 25g / 11 ms per IEC 60068-2-27. Installation altitude up to 2,000 m above sea level without derating. Surge voltage resistance 6 kV.