What it is and what it does
The Siemens 3RV1011-1CA10-ZW96 is a SIRIUS motor protection circuit breaker designed to protect motors against overload, short-circuit, and phase failure. It trips Class 10, meaning it clears an overload within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors on conveyors, pumps, and fans without nuisance tripping on start-up inrush. The rated voltage range spans 20 to 690 V, covering common low-voltage motor circuits from 24 V control transformers to 480/600 V line feeds. Breaking capacity is 100 kA at 240 V, 400 V, and 500 V, dropping to 2 kA at 690 V. On a 400 V line this holds the full fault current available from a typical 1 MVA transformer — no upstream fuse needed for short-circuit coordination in most panel designs. Phase failure detection is built in, so a lost leg on the supply side trips the breaker before single-phasing cooks the motor winding.
Panel integration and mounting
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. Any mounting position allowed. Dimensions: 45 mm wide, 90 mm tall, 75 mm deep. Clearance requirements: 20 mm above and below, 9 mm to the side, zero forward or backward clearance needed. That 45 mm width matches the standard 2.5 module pitch on a DIN rail — plan for 9 mm side gap between adjacent devices for heat dissipation. Main circuit terminals are screw-type, accepting 2×(0.5 to 1.5 mm²) or 2×(0.75 to 2.5 mm²) solid or stranded copper. Torque to M3 screw size. Ambient operating range -20 to +60 °C; storage and transport -50 to +80 °C. No ground-fault detection — this is a motor-protection-only device, not a GFCI.