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The ABB 3UA0000039660 is a motor protection relay belonging to the 3UA series. Specifically, it is a solid-state thermal overload relay (also known as an electronic overload relay or thermistor motor protection relay). It is designed to provide reliable and precise thermal protection for three-phase AC motors by monitoring motor current and temperature.
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Key Parameters Parameter Category Specification Product Type Electronic Thermal Overload Relay / Motor Protection Relay ABB Order Code 3UA0000039660 Application For protection of three-phase AC motors Thermal Protection Bi-metal or electronic simulation with adjustable current setting (Ir). Specific range depends on model variant (e.g., 0.1A - 1000A). Must be confirmed via datasheet. Sensor Input For connection to PTC thermistor sensors (e.g., 3 x PTC sensors) embedded in the motor windings. Provides direct temperature trip. Protection Functions • Thermal Overload Protection (based on measured current & I²t characteristic) • Phase Loss / Unbalance Protection • Locked Rotor / Stall Protection • Ground Fault Protection (optional or in certain models) • Thermistor-based Overtemperature Trip (via PTC sensors) Output Contacts Typically includes at least one changeover (NO/NC) alarm/trip contact. May also include a separate early warning (pre-alarm) contact. Control Supply Voltage Can be a wide range (e.g., 24-240V AC/DC) depending on the specific variant. Must be confirmed via datasheet. Mounting Designed for mounting on DIN rail. Can be used independently or in combination with a contactor. Standards & Approvals Typically complies with IEC/EN 60947-4-1, UL 508, etc.
