3UA66-00-3E, 250 - 400 amperage range, solid state overload relay, type 3UA, suitable for use with Siemens World Series contactors and motor starter model types 3TF54, 3TF55, 3TF56, 3TF57, assembled unit features manual reset button and is complete with wiring connectors and terminals, direct substitute for Siemens OEM 3UA66-00-3E