The Siemens SIRIUS 3RV1031-4DB15-ZX95 is a motor protection circuit breaker rated for 25 A continuous current, with a CLASS 20 trip characteristic — meaning it allows up to 20 seconds at 600% of the full-load current before tripping, standard for general-purpose induction motor starts on pumps, fans, and compressors. It switches 11 kW at 400 V in AC-3 duty (motor starting/stopping), and the interrupting ratings hit 100 kA at 240 V AC and 50 kA at 400 V AC, so it handles high-fault-current panel feeds without cascading upstream.
Coordination & Selectivity
No ground fault detection, so that function must come from a separate module or upstream device if required. The 14.5 W power dissipation in hot operating state matters for panel thermal budgeting when grouping multiple breakers in an enclosure — derating curves apply above 40 °C ambient.
Zero clearance at the sides and rear — no air gap needed between adjacent units, so it packs tight on the rail. Screw-type box terminals for the main circuit accept stranded up to 25 mm² (2x) or 35 mm² (1x); auxiliary and control circuits also use screw terminals. Solid wire range for aux circuits is 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²). Dimensions: 55 mm wide, 140 mm high, 149 mm deep. Mounting position any orientation.