Motor protection circuit breaker, 12.5 A, Class 10 — SIRIUS 3RV1021-1KA10-ZW95
The Siemens 3RV1021-1KA10-ZW95 is a SIRIUS motor protection circuit breaker rated for 12.5 A continuous current and 5.5 kW at 400 V AC, with a Class 10 trip characteristic. It snaps onto a 35 mm DIN rail (DIN EN 50022) and occupies 45 mm width, 97 mm height, and 96 mm depth — a compact footprint for a 3-pole device with screw-type terminals.
Protection and auxiliary features
Ground fault detection is not included. The mechanical life is 100,000 operations typical for the main contacts.
Screw-type terminals on the main circuit accept solid or stranded conductors: 2x (1 … 2.5 mm²) and 2x (2.5 … 6 mm²), or AWG 14–10. Finely stranded with core-end processing uses the same cross-sections. This covers most panel wiring up to 6 mm² without needing ferrule adapters.
Rated IP20 on the front — suitable for enclosed panels, not for washdown environments. Shock resistance is 25g / 11 ms, so it holds up in transport and moderate vibration. Mounting position is any, giving flexibility in tight enclosures.