Siemens 3RV2021-4EA10 Circuit Breaker

Siemens 3RV2021-4EA10 is a Sirius 3RV2 motor-protector circuit breaker (size S0) designed for three-pole motor protection. It combines a thermal overload release (class 10) with an adjustable current setting in the 27–32 A range and a magnetic release rated at 400 A, enabling both overload and short-circuit protection. The device uses screw terminals for mains connections, supports DIN-rail mounting, and is rated for AC mains up to 690 V. In Siemens Industry Mall and retailer listings, this model is listed as part of the Sirius 3RV2 family, with a typical motor rating around 15 kW at standard three-phase voltages (for example 400 V). The unit specifies a -20 to +60 °C operating ambient temperature range and three poles, matching common motor control panel configurations. As a compact S0-frame motor protector, 3RV2021-4EA10 provides integrated overload and short-circuit protection without requiring a separate overload relay, making it suitable for protecting motors in industrial applications such as conveyors, pumps, fans, and machine tools where dependable motor protection and straightforward installation are priorities.