The Siemens 3RV2031-4JA10-ZX95 is a SIRIUS motor protection circuit breaker, designed for motor protection with CLASS 10 trip characteristics — it opens within 10 seconds at 7.2× rated current, fast enough to protect standard induction motors from locked-rotor damage.
Clearance requirements: 50 mm above and below, 10 mm to the side, zero forward or backward. The 55 mm width means it occupies three standard 18 mm module positions on the rail — plan your enclosure fill accordingly. Screw terminals on the main circuit accept 2×(1…35 mm²) or 1×(1…50 mm²) solid or stranded copper.
Rating breakdown
Breaking capacity varies by voltage: 100 kA at 240 V, 30 kA at 400 V, 4 kA at 500 V, 2 kA at 690 V. Motor power ratings: 18.5 kW at 230 V, 25 hp at 220/230 V, 50 hp at 460/480 V. Rated voltage span is 20…690 V. Maximum switching frequency in AC-3 duty is 15 operations per hour.