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. Dimensions are 55 mm wide × 140 mm high × 149 mm deep, which fits a standard 3-module width on the rail.
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.
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).