Motor-protective circuit breaker for small induction motors
The Siemens SIRIUS 3RV1011-0FA10-ZW95 is a motor-protective circuit breaker rated at 0.1 kW at 230 V, making it suitable for protecting small induction motors — fractional-horsepower pumps, fans, or conveyor drives — in a control panel. Trip Class 10 means it disconnects within 10 seconds at 7.2× rated current, matching the thermal characteristic of standard IEC motor starters. The breaker carries a 100 kA SCCR at 240 V, 400 V, 500 V, and 690 V AC, so it safely interrupts fault currents up to that level without cascading upstream — adequate for most industrial distribution panels with transformer ratings up to around 2 MVA. Phase failure detection is built in, so a single-phasing condition on a three-phase motor trips the breaker before winding damage occurs. Temperature compensation is active across the -20 to +60 °C operating range, maintaining the trip curve outside the typical 20 °C calibration point.
Panel integration and mounting
Mounts via screw fixing or snap-on onto a 35 mm DIN rail per DIN EN 60715. The compact footprint — 45 mm wide, 90 mm high, 75 mm deep — fits a standard 45 mm modular device slot. Clearance requirements: 20 mm above and below, 9 mm at the sides, zero forward or backward. That 9 mm side gap is tight — adjacent breakers or contactors need that minimum for cooling and wiring access. Screw-type terminals on the main circuit accept 2×(0.5 to 1.5 mm²) solid/stranded or 2×(0.75 to 2.5 mm²) with ferrules. The M3 terminal screws are standard for this current class. No external fuses required up to 500 V; at 690 V a gL/gG 4 A backup fuse is needed (–).