Motor protection circuit breaker — 1.25 A, CLASS 10, 100 kA
This SIRIUS 3RV1021-0KA15-ZW96 is a motor-protection circuit breaker rated for a continuous current of 1.25 A, with a CLASS 10 trip characteristic — meaning it will trip within 10 seconds at 7.2× the set current, fast enough to protect standard induction motors against locked-rotor conditions without nuisance tripping on normal starts. Breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC — a single rating that covers common industrial supply voltages and gives plenty of headroom for high-fault panels. Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, so it fits standard enclosures without adapters. Front face is IP20; the terminals accept solid conductors from 0.5 mm² up to 2.5 mm² (two per clamp) and stranded up to 6 mm². Phase failure detection is built in — it will trip if one phase drops out, preventing single-phasing damage on a motor load. Operating temperature range is -20 to +60 °C, storage/transport -50 to +80 °C. Shock rated at 25 g for 11 ms. Power dissipation at rated current is 7.25 W in hot operating state.