The Siemens SIRIUS 3RV1021-0GA10-ZW96 is a 3-pole motor protection circuit breaker rated for 0.63 A continuous current with Trip Class 10 thermal overload protection. It delivers 100 kA breaking capacity across 240 V to 690 V AC, making it suitable for high-fault-current industrial panels. The design includes phase failure detection and mounts via screw or snap-on onto 35 mm DIN rail per EN 50022.
What the ratings mean for fit
The 0.63 A continuous current rating and 0.18 kW motor rating at 400 V AC size this breaker for small fractional-horsepower motors — think coolant pumps, small fans, or conveyor drives under 0.25 kW. Trip Class 10 means it trips within 10 seconds at 7.2× rated current, which protects standard induction motors during locked-rotor starts without nuisance tripping on normal acceleration. The 100 kA breaking capacity at 400 V AC is unusually high for a 0.63 A breaker — it handles worst-case bolted faults without needing an upstream current-limiting fuse. That SCCR headroom simplifies panel coordination in high-capacity distribution boards. Phase failure detection is built in, so a lost phase on the line side will trip the breaker — critical for motor protection in three-phase systems where single-phasing can burn out windings quickly.
Mounting and integration
Snap-on mounting onto 35 mm DIN rail per EN 50022 — no tools needed for installation or removal. Screw-type terminals on both main and auxiliary circuits accept solid or stranded conductors from 1 mm² up to 6 mm². The 45 mm width matches standard SIRIUS 3RV1 compact breaker spacing, so it fits existing panel layouts without re-drilling. IP20 on the front means finger-safe from the panel face but not washdown-rated — keep it inside a cabinet, not on the machine frame in wet areas. Operating temperature range of -20 to +60 °C covers most indoor industrial environments.