SIRIUS 3RV1021-1FA10-ZX95 — motor protection circuit breaker, 5 A, CLASS 10
The Siemens SIRIUS 3RV1021-1FA10-ZX95 is a 3-pole motor protection circuit breaker rated for 5 A continuous current with a CLASS 10 trip characteristic, meaning it protects standard induction motors against overload and short-circuit by tripping within 10 seconds at 7.2× the set current — matching the thermal curve of most general-purpose motors up to 1.5 kW at 400 V. Its interrupting capacity hits 100 kA at 240 V, 400 V, and 500 V AC, dropping to 6 kA at 690 V — so it handles high-fault-current panels up to 500 V without needing an upstream current-limiting fuse, which simplifies coordination in MCC or distribution boards. Built-in phase failure detection ensures the motor drops out on a lost phase, preventing single-phasing damage. The unit snaps onto a 35 mm DIN rail per EN 50022 and accepts screw terminals for both main and auxiliary circuits, with solid/stranded wire from 1 to 6 mm².
Mounting and panel fit
Fastens via screw or snap-on onto a 35 mm standard mounting rail per DIN EN 50022, any mounting position. Dimensions: 45 mm wide, 97 mm tall, 96 mm deep — fits a standard 45 mm module slot. Zero clearance needed at the back or sides. IP20 on the front face means it's protected against finger contact but not washdown — suitable for enclosed panels, not wet areas.
Operating conditions and approvals
Operating temperature -20 to +60 °C; storage and transport -50 to +80 °C. Shock 25g / 11 ms. Surge voltage resistance 6,000 V. Power dissipation 7.25 W hot (2.4 W per pole). Maximum operating frequency at AC-3 duty is 15 switching cycles per hour — fine for occasional motor start/stop, not for high-cycle jogging applications.