SIRIUS 3RV1031-4HA10-ZW97 — Motor Protection Circuit Breaker, 50 A, Class 10
The Siemens SIRIUS 3RV1031-4HA10-ZW97 is a 3-pole motor protection circuit breaker rated for 50 A continuous current, with a Class 10 trip characteristic — meaning it disconnects within 10 seconds at 7.2× the thermal setting, fast enough to protect standard induction motors against locked-rotor heating without nuisance tripping on normal starts. It is designed for motor protection duty, with phase failure detection built in (no ground fault detection). Rated for 22 kW at 400 V AC-3, this breaker handles the starting and running current of a 22 kW motor on a 400 V three-phase line. The breaking capacity is 50 kA at 400 V AC, 100 kA at 240 V, stepping down to 10 kA at 500 V and 4 kA at 690 V — so it safely interrupts fault currents up to those levels without upstream cascading, provided the available fault current at the panel is within these limits. Mounting is via screw and snap-on onto 35 mm DIN rail per EN 50022, in any position. The enclosure is IP20 on the front — protected against finger contact, but not against moisture or dust ingress into the panel interior. Dimensions are 55 mm wide × 140 mm high × 149 mm deep, which fits a standard 3-module width on the rail.
Terminal Capacity and Wiring
Main circuit terminals accept screw-type box terminals: solid conductors 2× (0.75…16 mm²), stranded 2× (0.75…25 mm²) or single 1× (0.75…35 mm²). AWG equivalents for the main contacts are 2× (18…2) and 1× (18…2). Auxiliary and control circuits use separate screw terminals. The backwards clearance is 0 mm — the breaker can be mounted flush against a panel wall or adjacent device without rear access needed.
Environmental and Compliance
Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Shock resistance is 25 g for 11 ms. The part is RoHS-compliant per the substance prohibition date of July 1, 2006. Power dissipation in hot operating state is 29 W total (9.7 W per pole). Surge voltage resistance is rated at 6000 V.