ABB TF65-28 Thermal Overload Relay TF65-28 Relay

The ABB TF65-28 thermal overload relay is an economical electromechanical protection device for the main circuit in motor starters, designed to be paired with AF40-65 contactors to protect 3‑phase motors in low‑voltage installations. It offers a setting range of 22–28 A per pole and carries a Class 10 thermal rating, making it suitable for standard motor protection tasks in industrial controls. Key electrical characteristics include a resistance per pole of 3.937 mΩ and a per‑pole power loss ranging from 1.9 W to 3.1 W depending on the setting. For system coordination, the TF65‑28 is specified to work with short‑circuit protection device coordination type 2 using 80 A gG fuses. This model is part of ABB’s TF65 family of thermal overload relays, specifically identified as TF65-28, and is intended to protect motors in line with AF40-65 contactors by limiting current before damage occurs while enabling precise adjustment within its 22–28 A range.