Siemens 3UA55-00-1D Relay

Siemens 3UA55-00-1D is a World Series solid-state overload relay designed to protect 3‑phase motors within Siemens ITE motor-control assemblies. The device is rated for a current range of 2.0 to 3.2 A, providing electronic current sensing to trigger protective action when motor current exceeds preset limits. The 3UA55-00-1D designation identifies an open-type 00/1D variant in Siemens’ 3UA family, a configuration commonly cataloged as World Series 3UA55 devices and used in compact motor-starter configurations alongside Siemens contactors to provide motor overload protection in industrial automation applications. This part is documented in Siemens literature as part of the 3UA family of overload relays.