The Siemens 3RV2311-1GC20 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates directly into a motor starter assembly, combining short-circuit and overload protection in one device. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, in any orientation. The 45 mm width and 97 mm depth fit standard panel layouts; clearance requirements are 50 mm upward and downward, 30 mm to the sides, with zero forward or backward clearance needed.
Breaking capacity and coordination
The headline figure is 100 kA breaking capacity at 240 V, 400 V, and 500 V — that is the fault current this device can safely interrupt without upstream damage. At 690 V the rating drops to 4 kA, which is typical for this class; the voltage stress on the arc chute limits the interrupt rating. For selectivity with upstream fuses, the spec calls for gL/gG fuses: 50 A at 400 V, 40 A at 500 V, 35 A at 690 V. That fuse coordination is what keeps a downstream fault from taking out the whole feeder.
Termination and ratings
The main current circuit uses spring-loaded terminals, accepting 2x (0.5 to 4 mm²) solid or stranded wire. No ground-fault or phase-failure detection built in — this is a straightforward motor-circuit protector, not a multifunction monitor. The rated voltage span is 20 to 690 V, covering most low-voltage industrial supplies. Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C.