The Siemens 3RV1011-0JA20 is a SIRIUS motor protection circuit breaker rated for 1 A continuous current with a CLASS 10 trip characteristic, sized for a 0.25 kW motor at 400 V AC. It delivers a 100 kA breaking capacity across the 240 V to 690 V range, so it can interrupt high fault currents without upstream fusing in most panel designs. The spring-loaded terminals on both main and auxiliary circuits accept 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule, which matches the wiring practice for control panels feeding motor starters.
Mounting and integration
Snap-on mounting onto 35 mm standard mounting rail per DIN EN 50022, with screw-fastening option for vibration environments. The 45 mm width and 81 mm depth fit a standard 45 mm modular device footprint on the DIN rail; zero clearance required at the sides or rear. IP20 finger-safe front protection allows panel-front access without additional shrouding. Any mounting position is permitted, which simplifies layout in crowded enclosures.
Protection and duty cycle
CLASS 10 trip class means the bimetal releases within 10 seconds at 7.2× rated current — the standard for standard-duty induction motor starting. Phase failure detection is built in, so the breaker trips on loss of one phase to prevent single-phasing damage. Rated for 15 operations per hour at AC-3 duty, which covers frequent starting cycles on conveyors or pumps. Power dissipation is 5.5 W total (1.8 W per pole) at rated load in hot operating state; account for this heat in enclosure sizing.