The Siemens 3RV1031-4GA15 is a SIRIUS motor protection circuit breaker rated for 45 A continuous current with a CLASS 10 trip characteristic, sized for 22 kW motor loads at 400 V AC. The 45 A rating governs the motor full-load current it can carry continuously.
Breaking capacity and fault coordination
This breaker clears 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. At 690 V the 4 kA rating is lower, so verify the SCCR if you're running a 690 V drive input. Ground fault detection is not included, so for ground-fault protection you need an external module or a separate ground-fault relay.
Mounting, wiring, and environment
Main circuit terminals accept solid conductors: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). Stranded conductors: 2x (0.75 to 25 mm²) or 1x (0.75 to 35 mm²). AWG equivalents for the main contacts are 2x (18 to 2) or 1x (18 to 2). The auxiliary and control circuit uses separate screw terminals. Shock-rated to 25g for 11 ms — tough enough for most industrial machinery.