The TF42-1.0 Thermal Overload Relay is a compact, economical electromechanical protection device for the main circuit in motor-control applications. It belongs to ABB's TF42 family (ABB part 1SAZ721201R1023) and offers an adjustable trip setting from 0.7 A to 4 A per pole, with a per-pole resistance of about 1.92 Ω and a typical power loss per pole of 1.1–1.9 W as the setting is adjusted. Designed to protect motors in industrial control circuits, it coordinates with short-circuit protection devices of type 2 (approximately 6.0 A, Type gG) and works with compatible contactors and motor starters.
