ABB TF65-67 Thermal Overload Relay

ABB TF65-67 Thermal Overload Relay is a three-pole electromechanical protection device used to guard the main motor circuit, designed to pair with AF40-65 class contactors in low‑voltage motor starters. It provides adjustable protection within a 57.0–67.0 A setting range and carries a trip class of 10, suitable for motor circuits up to 600 VAC. The unit carries ABB part number 1SAZ811201R1007 and is commonly used to protect motors in panels and MCCs by interrupting the circuit when the preset current is exceeded. For engineering detail, the TF65-67 has a per‑pole resistance of 0.759 mΩ, with typical power loss per pole at the setting extremes of about 2.5–3.4 W, reflecting its compact, economical design. Common applications include protecting small to medium industrial motors in control cabinets and starter assemblies where straightforward thermal protection is required.