Definite purpose contactor, 24-volt/AC. Contact ratings: 40-ampere@240/277-volt (AC)-AFL; 55-ampere@240/277-volt (AC)- resistive. One-pole, electromagnetically-operated, provides switching for starting induction motors. Meets ARI-780 standard at started ratings (500,000-cycle mechanical life, 200,000-cycle electrical life and 10,000-cycle recycle life)-- the most demanding ARI requirement. Silver cadmium oxide contacts provide long life under demanding duty cycles. Low profile design allows for more wiring room. Multiple mounting holes and slots for convenient, interchangeable mounting with most competitive devices.