What this SIRIUS motor protection circuit breaker does
The Siemens 3RV1011-1DA10-ZX95 is a SIRIUS motor protection circuit breaker designed for protecting three-phase induction motors. It combines overload protection (Class 10 trip curve) with short-circuit interruption, rated for 100 kA breaking capacity at both 240 V and 400 V. Phase failure detection is built in — if one phase drops out, the breaker trips before the motor single-phases and burns. No ground fault detection on this variant. The Class 10 trip class means it responds to a locked-rotor condition within 10 seconds at 7.2× rated current. That is the standard for standard-duty motor starting — not for high-inertia loads like crushers or centrifuges, which need Class 20 or 30. For a pump, fan, compressor, or conveyor drive, Class 10 is what the motor winding insulation expects.
Mounting and panel fit
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715. That is the standard DIN-rail profile found in every industrial control panel. Mounting position is any orientation. The footprint is 45 mm wide × 90 mm tall × 75 mm deep — a compact 45 mm module that occupies one single-width slot on the rail. Clearance requirements: 20 mm upward, 20 mm downward, 9 mm to the side, zero forward or backward. That 9 mm side gap is tight — adjacent devices must respect it, or the arc-chamber venting and conductor bending space is compromised.
Breaking capacity and short-circuit coordination
Rated short-circuit breaking capacity is 100 kA at both 240 V and 400 V. That is a high-fault rating — it means this breaker clears a bolted fault up to 100,000 amps without welding its contacts or rupturing the case. At 500 V the rating drops to 3 kA; at 690 V it is 2 kA. For most 400 V industrial distribution (where prospective fault current is typically 25–65 kA), the 100 kA figure gives plenty of SCCR headroom. The required backup fuse varies by voltage: at 240 V none required; at 400 V use gL/gG 40 A; at 500 V or 690 V use gL/gG 35 A.
Termination and wiring
Main current circuit terminals are screw-type, size M3. Accepts two conductors per terminal: 2 × (0.5 to 1.5 mm²) solid or stranded, or 2 × (0.75 to 2.5 mm²). That is standard for motor branch circuits up to the rated current of this frame. The temperature compensation range is -20 to +60 °C, same as the operating ambient. Storage and transport range is -50 to +80 °C.