The Siemens 3RV5031-4AA10 is a SIRIUS motor protection circuit breaker, size S2, with a 16 A rated operational current and a Class 10 thermal overload trip. The 3-pole breaker uses screw-type box terminals and mounts on a 35 mm DIN rail per EN 50022 — snap-on or screw fastening, any position. Power loss runs about 12 W total at rated load.
The 16 A rated current at AC-3 (400 V) is the motor-switching figure that governs real use — it matches a typical 7.5 kW induction motor on a 400 V line. The Class 10 trip characteristic means the thermal overload element will trip within 10 seconds at 7.2× rated current, which protects standard squirrel-cage motors during start-up without nuisance tripping on normal acceleration. The magnetic short-circuit release handles fault clearing independently. The 690 V rated insulation voltage gives headroom for 480 V or 600 V class systems.
The S2 frame is 55 mm wide, 140 mm high, 149 mm deep.