The Siemens SIRIUS 3RV1011-1HA25 is a motor protection circuit breaker rated for 8 A continuous current with a Class 10 trip characteristic. It's designed to protect three-phase motors up to 3 kW at 400 V AC, and it includes phase failure detection — a critical feature for preventing single-phasing damage on motor loads. The breaker's 50 kA breaking capacity at 400 V AC means it can safely interrupt high fault currents without needing an upstream fuse in most industrial panel designs.
Mounts on a 35 mm DIN rail per EN 50022 with a screw-and-snap-on mechanism, taking up 45 mm of width. The spring-loaded terminals on both main and auxiliary circuits accept 0.25 to 2.5 mm² solid or stranded wire (24 to 14 AWG). No clearance needed at the sides or rear — zero spacing required — so you can pack these tight in a panel. IP20 on the front means it's protected against finger contact but not washdown; keep it inside an enclosure.
Breaking capacity varies by voltage: 100 kA at 240 V AC, 50 kA at 400 V AC, dropping to 3 kA at 500 V and 2 kA at 690 V. The maximum switching frequency for AC-3 duty is 15 operations per hour. Power dissipation in hot operating state is 9.25 W — factor that into panel thermal calculations. Operating temperature range is -20 to +60 °C, with storage and transport from -50 to +80 °C. Shock resistance is 25 g for 11 ms, and it can be mounted in any orientation.