The Siemens SIRIUS 3RV1021-0FA10-ZW96 is a 3-pole motor protection circuit breaker rated for 0.5 A continuous current, designed to protect motors against overload and short-circuit in industrial control panels. Its Trip Class 10 characteristic means it will trip within 10 seconds at 7.2x the rated current, matching the thermal curve of standard IEC induction motors during startup. The breaker carries a 100 kA breaking capacity at 400 V AC, sufficient to clear high-fault-current scenarios without upstream fuses in most panel configurations. Phase failure detection is built in, so a lost phase on the line side will trip the breaker rather than letting the motor single-phase and overheat.
Mounting and wiring
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. The 45 mm width fits a standard 45 mm slot in a modular enclosure. Screw-type terminals for both main and auxiliary circuits accept solid or stranded conductors: 2x (1…2.5 mm²) and 2x (2.5…6 mm²), with AWG equivalents 2x (14…10). No side clearance needed — 0 mm spacing to adjacent devices. IP20 on the front, so it's protected against finger contact but not washdown; keep it inside a closed panel.
Key ratings at a glance
Breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC — flat across the voltage range, so no derating needed for higher-voltage panels. Rated insulation voltage 690 V, surge voltage resistance 6 000 V. Operating frequency max 15 switching cycles per hour at AC-3 duty. Power dissipation 5.5 W in hot operating state (1.8 W per pole). Ambient operating range -20 to +60 °C; storage and transport -50 to +80 °C. Shock resistance 25g / 11 ms. Mounting position any.
Compliance documentation
RoHS compliance date listed as 01.05.2012, indicating the part meets EU RoHS substance restrictions. No specific UL or CSA listing is recorded in the source data, but as a Siemens SIRIUS industrial control component it typically carries IEC/EN 60947-4-1 certification for motor starters. For a specific project UL listing, verify the exact variant against the manufacturer's declaration.