Siemens 3UA52-00-1C Overload Relay

Siemens 3UA52-00-1C Overload Relay is a compact motor-protection device in the Siemens World Series that monitors current drawn by an AC motor and trips the control circuit when the preset limit is exceeded, helping prevent winding damage and motor burnout. It supports a current setting range of 1.6 to 2.5 A and is rated for voltages up to 690 V AC, making it suitable for mid-sized motors in three‑phase power systems and a wide variety of industrial applications. The 3UA52-00-1C includes phase-failure sensitivity, which detects loss of a single phase and ensures a safe shutoff when abnormal power conditions occur, reducing the risk of overheating and abnormal startup. Designed to work with compatible Siemens contactors and control circuitry, this relay is commonly deployed in conveyors, pumps, and fans, as well as general machinery where the motor load sits within the 1.6–2.5 A window and the supply is within 690 V three-phase or single-phase systems. For installation and maintenance, users rely on Siemens documentation or authorized distributors for the exact accessories and mounting options associated with the 3UA50/3UA52 family.