Motor protection circuit breaker for the panel line
The Siemens SIRIUS 3RV1021-4BA15-ZW97 is a motor protection circuit breaker rated for 20 A continuous current, sized for a 7.5 kW motor at 400 V AC. Trip class is CLASS 10.
Shock rated at 25g for 11 ms — survives transport and normal industrial vibration without nuisance trips.
Terminal capacity and auxiliary contacts
Main circuit terminals accept solid conductors from 0.5 to 1.5 mm² (two per clamp) and stranded from 1 to 2.5 mm² (two per clamp). The auxiliary switch is transverse design, rated 1 A at 24 V, 0.5 A at 230 V, 0.15 A at 60 V — enough for a PLC input or contactor coil feedback, but not for direct motor switching. No ground fault detection on this unit; phase failure detection is present. Mechanical endurance of the main contacts is 100,000 operations typical.