Siemens 3UA52-00-1B Overload Relay is a thermal-delayed protection device in the Siemens 3UA family, rated for 1.25 to 2 A. It is designed for mounting on a contactor as part of a motor starter to protect small to mid-size three-phase motors from overload by interrupting the main circuit when current exceeds the set range. This model is used within Siemens motor protection schemes and complements other 3UA relays to tailor protection for specific motor currents in panel-mounted control assemblies.
