ABB TF42-38 Thermal Overload Relay

ABB TF42-38 Thermal Overload Relay is an electromechanical motor-protection device in the TF42 family, designed to protect three-phase motors in main-circuit protection when paired with ABB line starters. It provides a fixed full-load current rating of 38.0 A and uses a Class 10 trip characteristic, with an adjustable trip range listed as 35.0–38.0 A (40.0 A maximum in some catalog entries). Rated for 480/600 V AC operation, it coordinates with short-circuit protection devices in a Type 2 arrangement to help ensure selectivity in motor control circuits. This three-pole relay is intended for use with ABB contactors and is commonly applied to pumps, fans, conveyors, and other industrial motors where reliable overload protection is required.