The Siemens SIRIUS 3RV1011-1KA20 is a motor-protective circuit breaker sized for 12 A continuous current, with a CLASS 10 trip curve — meaning it will disconnect before the motor windings overheat during a locked-rotor condition on most standard induction motors up to 5.5 kW at 400 V AC. Phase failure detection is built in; ground fault detection is not. For applications that require GF protection, you'll need an external residual-current device downstream.
Breaking capacity and coordination
Rated short-circuit breaking capacity reaches 100 kA at 240 V AC, 50 kA at 400 V AC, then drops to 3 kA at 500 V and 2 kA at 690 V. At 400 V — the most common industrial distribution voltage — this breaker clears faults up to 50 kA without upstream fuses in most Type 2 coordination schemes.
Mounting and wiring
Snaps onto 35 mm DIN rail per EN 50022; screw-mount also supported. Mounting position is any orientation. Width is 45 mm — three 18 mm module spaces — which keeps panel layout tight. Spring-loaded terminals on both main and auxiliary circuits accept 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule. AWG equivalent is 2x (24... 14). No screw torque to check — just strip to 8–10 mm and push in.
Environmental and compliance
Operating temperature range is -20 to +60 °C; storage and transport handle -50 to +80 °C. Front face carries IP20 protection — suitable for enclosed panel use, not for washdown environments. Shock rated to 25 g for 11 ms. Surge voltage withstand is 6 000 V. RoHS compliance date is 01.01.2013 (substance prohibition per EU directive).