ABB TF140DU-110 Thermal Overload Relay

ABB TF140DU-110 Thermal Overload Relay is a three-pole motor protection device designed for direct mounting on ABB AF-series contactors (AF116–AF146) in the main circuits of AC motors. It provides overload protection with a setting range of 80–110 A per pole, is rated for 480/600 V AC at 50/60 Hz, and uses screw-terminal connections for reliable wiring; the order code is 1SAZ431201R1002. Weighing about 0.82 kg, the unit includes a 1 NC/1 NO auxiliary contact rated at 3 A at 120 VAC, and per-pole winding resistance of approximately 0.378 mΩ with typical power loss of 2.4–4.6 W depending on the setting. For short-circuit protection coordination, TF140DU-110 coordinates with gG-type fuses up to 224 A (type 2 coordination), making it a compact, economical protection solution for industrial motor circuits.