What it is and what it does
The Siemens SIRIUS 3RV2011-1KA10-0BA0 is a motor protection circuit breaker in frame size S00, designed for protecting three-phase motors against overload and short-circuit. It combines a thermal-magnetic trip with a CLASS 10 trip class, meaning it trips within 10 seconds at 7.2× the thermal setting — fast enough to protect a standard induction motor winding during a locked-rotor event. The breaker has phase failure detection built in, which ensures that loss of one phase causes a trip rather than single-phasing the motor.
Key ratings and what they mean for fit
Rated voltage covers 20 to 690 V, so it works across low-voltage motor circuits from 24 V control transformers up to 690 V industrial mains. Breaking capacity at 400 V is 100 kA — that's the maximum prospective fault current it can safely interrupt without welding contacts or rupturing the case. At 690 V the breaking capacity drops to 4 kA, so verify the available fault current if your panel runs 690 V. The gG fuse backup ratings (63 A at 400 V, 50 A at 500 V, 40 A at 690 V) tell you the maximum upstream fuse that still allows the breaker to clear a fault within its rated capacity — important for selectivity coordination.
Mounting and panel integration
Mounts on 35 mm DIN rail per DIN EN 60715 — both snap-on and screw fixing are supported, so you can secure it in high-vibration environments. The S00 frame is compact: 45 mm wide, 97 mm deep, 97 mm tall. Clearance requirements: 50 mm above and below, 30 mm to the side, and zero forwards or backwards clearance needed, meaning it can sit flush against the back panel or a busbar. Screw-type terminals accept 2 × (0.75 to 2.5 mm²) solid/stranded or 2 × 4 mm², with M3 screws and a 5–6 mm screwdriver shaft. Mounting position is any, so horizontal or vertical rail orientation works.