Siemens 3RV1021-4CA10 Molded Case Circuit Breaker

Siemens 3RV1021-4CA10 is a three‑pole molded‑case circuit breaker in the Sirius 3RV2 motor‑protector family, designed as a compact protective device for 3‑phase motors. It provides Class 10 overload protection with an adjustable overload release in the 17–22 A range and a rated short‑circuit current up to 50 kA at 400 V, with screw‑terminal connections for secure wiring. The S0 frame size and screw terminals suit panel installations where motor protection is combined with circuit protection, and the device supports AC (and DC) voltage environments. The unit is rated for up to 22 A nominal current, and for AC‑3 service at 400 V it offers about 11 kW of motor protection capability, making it appropriate for small to medium servo and low‑voltage motor drives. With no auxiliary contacts, it focuses on primary motor protection while maintaining simple integration into standard motor control circuits.