The Siemens 3RV1041-4JA15-ZW95 is a SIRIUS motor protection circuit breaker rated for 63 A continuous current, sized for a 30 kW motor at 400 V AC with CLASS 10 trip characteristics — meaning it disconnects within 10 seconds at 7.2× rated current, protecting against overload and short-circuit on motor start-up. The IP20 front face keeps fingers out of live terminals. At 240 V it's 100 kA, at 500 V it drops to 12 kA, and at 690 V it's 6 kA.
The 63 A continuous rating and 30 kW motor capacity at 400 V tell you this is a heavy motor feeder — think 50–75 hp pump or compressor on 480 V three-phase. The CLASS 10 trip curve is standard for standard induction motors; it lets through starting inrush without nuisance tripping. No ground-fault detection on this unit — that's a separate add-on or upstream GFCI. Operating temperature spans -20 to +60 °C, storage -50 to +80 °C. The 25g / 11 ms shock rating means it holds calibration on a machine tool or conveyor line that sees vibration.
Main circuit terminals are screw-type with box terminals. Solid conductors: 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²). Stranded: 2× (10…50 mm²) or 1× (10…70 mm²). That's enough for 63 A on a 16–25 mm² stranded cable, depending on local code. Auxiliary switch is transverse design, rated 1 A at 24 V, 0.5 A at 230 V, 0.15 A at 60 V — enough for a PLC digital input or contactor coil feedback.