The Siemens 3RR2142-2AW30 motor protection relay monitors and protects motors against overload and phase failure in the 4-40 A current range. It installs directly in the load feeder and works with contactors to interrupt power when current exceeds set limits. The relay carries the exact part designation 3RR2142-2AW30 for identification in Siemens control panels and motor starter assemblies.
