What it is and what it does
The Siemens 3RV2011-0KA20 is a SIRIUS motor protection circuit breaker, designed specifically for motor protection in control panels. It combines a circuit breaker and a thermal-magnetic overload relay in one device, so it disconnects the motor under both short-circuit and sustained overload conditions. Trip Class 10 means it will trip within 10 seconds at 7.2× the rated current — fast enough to protect standard induction motors during a stalled-rotor condition, without nuisance tripping on normal starting inrush. Phase failure detection is built in, so a lost phase on the line side shuts down the motor before single-phasing damages the winding.
Breaking capacity — the number that matters for fault coordination
Rated breaking capacity is 100 kA at 400 V AC and 690 V AC, which is high for a motor-protection breaker in this frame size. That means it can safely interrupt a fault up to 100 kA without the arc escaping or the device rupturing, so you can use it downstream of a transformer with high prospective fault current without needing a current-limiting fuse upstream — provided the SCCR of the whole panel is coordinated. At 240 V AC the rating is the same 100 kA, so it holds up across common industrial supply voltages.
Mounting and integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. Any mounting position is allowed, which simplifies panel layout — no derating for horizontal vs vertical orientation. Dimensions are 45 mm wide by 106 mm high by 97 mm deep, so it occupies a standard 45 mm module width on the rail. Clearance distances: 50 mm above and below, 30 mm to the side, and zero forward or backward — meaning it can be stacked against the back panel or enclosure wall without extra air gap. Main circuit connection uses spring-loaded terminals that accept 2× (0.5 to 4 mm²) solid or stranded wire. No screw torque to verify — just strip and insert.
Lifecycle and sourcing reality
Lifecycle stage is marked as current production — this is not a phase-out or NRND part. It is still the active catalog number from Siemens for this rating and frame.