Siemens 3RV1021-1EA15 Motor Protection Circuit Breaker

Three-pole Siemens Sirius 3RV1021-1EA15 motor protection circuit breaker (size S0) protects small motors in control panels by combining overload protection with a front-mounted auxiliary switch for feedback and interlocking. It provides an adjustable current-dependent overload release from 2.8 to 4 A for AC-3 service at 400 V and 50/60 Hz, with a rated value up to 690 V and screw-terminal connections for reliable wiring. The unit features IP20 protection on the front, an impulse withstand of 6 kV, and a mechanical life rated around 100,000 switching cycles. It is designed for DIN-rail mounting and suitable for installations up to 2,000 m above sea level. The accessory includes a front auxiliary contact set (1 NO + 1 NC) and is commonly used to protect motors such as pumps, fans, conveyors, and machine tools in industrial panels. As part of the Sirius 3RV family, the 3RV1021-1EA15’s typical successor is 3RV2011-1EA15.