ABB T7DU Thermal Overload Relay 2.4-4.0A 3 Pole 1NO 1NC

ABB T7DU4.0 Thermal Overload Relay is a three‑pole protection device designed to accompany ABB mini contactors and protect 3‑phase motors in conveyor, pump, and fan applications. It features a settable thermal current range of 2.4 to 4.0 A per pole, enabling coordination with motor ratings and drive systems. This model also includes an auxiliary contact arrangement of 1 normally open and 1 normally closed, allowing simple signaling and interlocking within the control circuit. As part of ABB’s T7DU family, it provides robust, electromechanical overload protection in compact form factors suitable for panel integration and modular control schemes. The 2.4–4.0 A setting window corresponds to the ABB catalog designation T7DU4.0, distinguishing it from lower ranges such as 0.24–0.40 A and higher ranges in the same family. Typical installations pair the T7DU4.0 with compatible ABB contactors to deliver coordinated protection for small to medium three‑phase motors, while the integrated NO/NC auxiliary contact supports monitoring and control logic without requiring separate devices. This model’s wiring and interface are configured to align with ABB’s control components, ensuring straightforward replacement and consistent performance across ABB’s motor protection lineup.