The HAT903ASAC24 is a heavy-duty, single-pole single-throw normally open (SPST-NO) electromechanical relay from the HAT-900 series. It operates with a 24V AC coil that has a nominal resistance of 120 Ohms and consumes approximately 2VA of power. The relay is rated for a 40A normally open resistive load at 277VAC, featuring contacts made from silver cadmium oxide with a copper base. Housed in a sealed cover with quick-connect, flange-mount terminals, it is designed for a Class B operating temperature range of -40°C to 85°C. Its high current capacity makes it suitable for various power switching applications.