Siemens 3RV1021-1DA10 Motor Protection Circuit Breaker

Siemens 3RV1021-1DA10 is a three‑pole motor protection circuit breaker (MPCB) in the Sirius 3RV family, designed as a size S0 device that combines thermal overload protection with short‑circuit protection for motors. The thermal overload (A‑release) is adjustable from 2.2 to 3.2 A (In 3.2 A), while a fixed short‑circuit release provides protection up to 42 A. It is rated for 220–690 VAC operation, intended for DIN‑rail mounting with screw terminals and front IP20 protection. In typical 220–690 VAC motor circuits, this model offers about 1.1 kW of motor protection capability, making it suitable for industrial panels, conveyors, pumps, and other machinery where reliable motor protection and quick fault clearance are required.