The Siemens 3RV1011-0FA20 is a SIRIUS motor protection circuit breaker rated for 0.5 A continuous current with Trip Class 10 thermal overload protection. Its 100 kA breaking capacity at 400 V AC means it can safely interrupt fault currents up to that level without upstream fuses or cascading damage — a critical spec for high-fault-capacity industrial panels where a lower-rated breaker would require a current-limiting upstream device.
What the ratings mean for fit
The 0.5 A rated current and 0.12 kW motor rating at 400 V size this breaker for small motor loads — fractional-horsepower pumps, fans, or conveyor drives. Trip Class 10 means it trips within 10 seconds at 7.2× rated current, matching standard induction motor startup curves without nuisance tripping. The 100 kA breaking capacity across all voltage points up to 690 V (–) is the same high-interrupt rating found on larger SIRIUS frames, so this compact 45 mm wide unit handles fault levels typical of main distribution panels, not just sub-feeds.
Integration and mounting
Mounts via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 50022. The 45 mm width and 81 mm depth fit standard enclosure backplanes with zero side clearance required. Spring-loaded terminals on both main and auxiliary circuits accept 0.25–2.5 mm² solid or 0.25–1.5 mm² finely stranded with ferrule — no screw torqueing, which speeds panel wiring. IP20 finger-safe touch protection on the front means the breaker can sit behind an open cabinet door during commissioning without shock hazard.