What it is and where it lands
The Siemens 3RV1011-0DA20 is a SIRIUS motor protection circuit breaker sized for a 0.09 kW motor at 400 V AC. It snaps onto a 35 mm DIN rail per EN 50022 — standard panel integration for any control cabinet. Rated continuous current is 0.32 A, with a Class 10 trip characteristic. Breaking capacity holds at 100 kA across the full voltage range (240 V to 690 V AC), so it safely interrupts a bolted fault at the panel's available fault current without cascading upstream.
Termination and wiring reality
Both main and auxiliary circuits use spring-loaded terminals — no screw torque to check, just strip and push. Main contacts 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). Mounting position is any orientation; zero clearance needed at the sides or rear (0 mm backwards, 0 mm at the side), so it packs tight against adjacent devices on the rail.
Protection features and thermal load
Phase failure detection is built in — if one phase drops, the breaker trips. Ground fault detection is not included; that requires an add-on module or separate RCD. Power dissipation in hot operating state is 5.5 W total, 1.8 W per pole. That's the heat you need to vent in a sealed enclosure; at 0.32 A continuous it's modest, but the Class 10 curve means short overloads dump more heat into the bimetal. An auxiliary switch can be added via the product extension slot — the base unit ships without one, but the option is there for remote status feedback.