Siemens 3RV2021-4EA10 3-Pole Manual Motor Protector

Siemens 3RV2021-4EA10 is a three-pole motor protector circuit breaker (size S0) with a rotary ON/OFF handle, designed to protect industrial motors by combining manual disconnection with thermal-magnetic overload protection. It provides an adjustable overload setting of 27–32 A (A-release) and a magnetic release rating of 400 A (N-release), delivering Class 10 trip performance (trips within 10 seconds under overload). The unit is suitable for AC-3 service up to 400 V and is intended for DIN-rail mounting within Sirius 3RV2 motor protection assemblies, with screw-terminal wiring for straightforward installation. Typical motor protection specifications indicate it can guard motors up to roughly 15 kW at 400 V AC, making it a compact, integrated solution for motor protection and control in modern control cabinets.