Siemens 3RV1721-1HD10 Circuit Breaker Motor Starter

Siemens 3RV1721-1HD10 is a three-pole motor protection circuit breaker in the S0 frame of the SIRIUS 3RV2 family, designed to function as a compact motor starter with integrated protection in industrial control cabinets. It is rated for up to 690 V AC and 3‑phase circuits, with a thermal overload release rated at 8 A and a short‑circuit release rated at 104 A, offering a 4 kA short‑circuit interrupt capacity. Connections are via screw terminals, and the device carries UL 489 and CSA C22.2 no.5-02 approvals. Siemens catalogs note this model as replacing the 3RV1721-0HD10 in many listings. Typical applications include motor feeders and small motor control panels where reliable motor protection and straightforward switching are required.