What it is and what it does
This Siemens SIRIUS 3RV1011-1HA20 is a motor-protection circuit breaker rated for 8 A continuous current with a CLASS 10 trip characteristic — meaning it will trip fast enough to protect a standard motor during a stall or locked-rotor condition before the windings overheat. It's sized for a 3 kW motor at 400 V AC. The breaker mounts on 35 mm DIN rail per EN 50022, and its 45 mm width fits a standard modular enclosure grid. Spring-loaded terminals on both main and auxiliary circuits mean no screwdriver needed for termination — good for panel builds where you're cranking out several of these.
Breaking capacity and fault handling
At 400 V AC it interrupts 50 kA — that's the SCCR you need for most industrial distribution panels fed from a typical transformer. At 240 V it handles 100 kA; at 690 V it drops to 2 kA. The 6 000 V rated surge voltage resistance means it can ride through transient spikes common on motor circuits without nuisance tripping. Phase failure detection is built in — if one leg drops, the breaker trips, which keeps a three-phase motor from single-phasing and burning out. No ground-fault detection on this variant, so if you need that, you're adding an external module or a different unit.
Mounting and wiring
Screw and snap-on mounting onto 35 mm DIN rail per EN 50022. Mounting position is any — horizontal, vertical, upside-down, whatever the panel layout needs. The IP20 front face means it's finger-safe when installed in a closed panel. Spring-loaded terminals accept 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule. For AWG, that's 2x (24... 14). No torque spec to chase — just strip to 8-10 mm and push in.
Environmental and compliance
Operating temperature range is -20 to +60 °C; storage and transport go from -50 to +80 °C. Shock rated at 25 g for 11 ms — survives rough handling during shipping. Power dissipation at rated load is 9.25 W total, 3.1 W per pole — factor that into enclosure thermal calculations. RoHS compliance date is 01.01.2013 — it's been RoHS-compliant since then. The part carries finger-safe touch protection and surge voltage resistance at 6 000 V.