The Siemens SIRIUS 3RV1031-4HA10-ZX95 is a motor protection circuit breaker rated for 50 A continuous current, switching 22 kW at 400 V. It carries Trip Class 10 thermal protection, meaning it trips within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors against locked-rotor conditions without nuisance tripping on normal starts. Breaking capacity is voltage-dependent: 100 kA at 240 V AC, 50 kA at 400 V, 10 kA at 500 V, and 4 kA at 690 V. That 50 kA at 400 V gives headroom for high-fault panels without cascading upstream breakers. Mounts via screw and snap-on onto 35 mm DIN rail per EN 50022, any position. Dimensions are 55 mm wide by 140 mm high by 149 mm deep — fits a standard panel cutout. Screw-type terminals on main and control circuits accept solid 2x (0.75…16 mm²) and stranded up to 2x 25 mm² or 1x 35 mm².
Protection and diagnostics
Built-in phase-failure detection catches a lost phase before the motor overheats — essential for screw compressors or conveyors that can stall on single-phase. No ground-fault detection, so pair with a separate RCD if the application requires it. Rated surge voltage resistance is 6,000 V, and the front face carries IP20 protection — safe for enclosed panels but not washdown areas.
Lifecycle and sourcing
RoHS compliance date is July 1, 2006, covering the EU directive. The part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.