Siemens 3UA5800-2U is a thermal overload relay (63–80 A) used for motor protection in Siemens starter circuits, providing thermal-delay protection to automatically disconnect a motor when overload current is detected. It includes one normally open and one normally closed auxiliary contact for feedback or interlock signals. Rated for operation up to 600 VAC, this model is identified by the article number 3UA5800-2U and is designed to coordinate with compatible Siemens contactors in protective motor-control assemblies.
