The Siemens 3RV1011-0HA20 is a SIRIUS motor-protective circuit breaker rated for 0.8 A continuous current with Trip Class 10 thermal overload protection. The 0.8 A rating corresponds to roughly 0.18 kW at 400 V three-phase, so this is sized for fractional-horsepower motors: small conveyors, fan drives, pump auxiliaries.
The 45 mm width eats one standard DIN module; depth is 81 mm, height 90 mm. Zero clearance needed at the back or sides — no ventilation gap required, so it packs tight in a panel. Spring-loaded terminals on both main and auxiliary circuits accept 2x (0.25 to 2.5 mm²) solid or 2x (0.25 to 1.5 mm²) finely stranded with ferrule. AWG equivalent is 2x (24 to 14). The IP20 finger-safe front cover protects against accidental contact in an open panel.
Rated short-circuit breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC — flat across the voltage band. That gives generous SCCR headroom for most industrial distribution panels; the breaker can clear a fault without upstream fuse assistance in high-fault installations. Power dissipation is 5.5 W total in hot operating state, or 1.8 W per pole. That matters for enclosure thermal rise calculations when grouping several breakers in a small cabinet.
Shock resistance is 25 g for 11 ms. RoHS compliance date is 01.01.2013, covering the EU substance prohibitions. The auxiliary switch extension option is supported, so you can add a signal contact for remote status monitoring.