The Siemens SIRIUS 3RV1021-1HA15-ZW97 is a motor protection circuit breaker rated for 8 A continuous current and 3 kW at 400 V, with a Class 10 trip characteristic — meaning it clears overloads fast enough to protect standard induction motors during stall or jam conditions without nuisance tripping on normal starts. Breaking capacity reaches 100 kA at 240 V and 400 V AC, dropping to 42 kA at 500 V and 6 kA at 690 V — enough for most industrial panel fault levels, but verify the available fault current at your service voltage.
Screw-type terminals on main and auxiliary circuits accept solid conductors from 0.5 mm² to 1.5 mm² (two per clamp) and stranded from 1 mm² to 6 mm² (two per clamp); AWG equivalents are 14–10 for the main contacts.