Siemens 3UA5900-1D Overload Relay

Siemens 3UA5900-1D Overload Relay is a three‑pole thermal overload device in the Siemens 3UA59 family, used to protect three‑phase motors by tripping when current exceeds a preset limit. The 00-1D variant specifies a current range of 2 to 3.2 A and is listed as a direct fit for Siemens 3TF World Series contactors, covering models such as 3TF30 through 3TF46. This relay is designed to be used in motor control panels alongside Siemens contactors to provide reliable overload protection within modular Siemens control architectures. Applications include safeguarding small to mid‑size motors in conveyors, pumps, fans, and machine tools, enabling straightforward integration into existing Siemens electrical schemes.