Siemens 3RV1021-1EA10 Motor Protection Circuit Breaker

Siemens 3RV1021-1EA10 Motor Protection Circuit Breaker is a three‑pole Sirius device (size S0) designed to protect three‑phase motors from overload and short‑circuit events. It provides an adjustable thermal overload release in the 2.8–4 A range (A‑release) and a fixed short‑circuit release rated around 52 A, enabling reliable protection for motor startup transients. The unit features screw terminals for straightforward wiring, an IP20 enclosure rating, and operation across a broad ambient range of -20 to +80 °C, with a mechanical life of about 100,000 switching cycles for the main contacts. This listing pairs the MPCB with a Siemens Sirius 3RT1024‑1A..0 contactor, forming a common motor control package: the contactor handles the main motor switching while the MPCB provides overload and short‑circuit protection. The 3RT1024‑1A..0 family is a three‑pole Sirius contactor used in motor control circuits, with coil voltage and exact current ratings varying by variant to match the motor’s voltage and load requirements.