The Siemens 3RV1021-1KA10-ZW97 is a SIRIUS motor protection circuit breaker, 3-pole, rated for 12.5 A continuous current and 5.5 kW at 400 V. No ground fault detection on this variant.
Breaking capacity and where it fits
Breaking capacity is 100 kA at both 240 V and 400 V AC, dropping to 42 kA at 500 V and 6 kA at 690 V. The 45 mm width means it takes up a single modular slot on the rail.
Wiring and ratings at a glance
Terminals accept solid or stranded wire: 2 conductors of 1 to 2.5 mm², or 2 conductors of 2.5 to 6 mm². For AWG, that's 2x 14-10 AWG. The depth is 96 mm, height 97 mm — fits standard shallow enclosures. Maximum operating frequency in AC-3 duty is 15 operations per hour — that's fine for a pump or conveyor starting a few times an hour, but not for a rapid-cycling application like a press or a crane.