Siemens 3UA50 00-1B Overload Relay

Siemens 3UA50-00-1B is a thermal-delayed overload relay in the World Series family that protects motors by interrupting current when an overload occurs. The unit is designed for use with Siemens contactors and starter assemblies, and is commonly paired with 3TF30, 3TF31, 3TF40, 3TF41, 3TB40, and 3TB41 sizes. It provides a setting range of 1.25 to 2 A, enabling precise adjustment to match the motor's running current. This overload relay includes a manual reset button and is supplied with wiring connectors and terminals for straightforward integration into a Siemens starter circuit. The 3UA50-00-1B is a direct OEM replacement in the Siemens World Series, intended to be used as part of motor protection circuitry alongside compatible Siemens devices. When paired with the appropriate contactor, the relay protects motors from overload by triggering a trip in response to excess current.