The Siemens 3RV1011-0JA20-ZW95 is a SIRIUS motor protection circuit breaker designed to guard a 0.25 kW motor at 400 V AC — that's a 1 A continuous current rating with a CLASS 10 trip curve, meaning it will clear a stalled-rotor condition fast enough to keep the motor windings from cooking before the overload relay can catch it.
Breaking capacity and protection
Rated breaking capacity hits 100 kA at 240 V, 400 V, 500 V, and 690 V AC — that's a full-range short-circuit rating that covers most industrial supply voltages without derating. Power dissipation runs 5.5 W total hot, 1.8 W per pole — panel builders need to account for that in a sealed enclosure to avoid derating the breaker itself.
Main circuit uses spring-loaded terminals accepting 2x (0.25 to 2.5 mm²) solid or 2x (0.25 to 1.5 mm²) finely stranded with ferrule — no screw torque to check, just strip and push. IP20 on the front; keep it inside a cabinet — this is not a washdown-rated device.