The Eaton Cutler-Hammer D40RB is an electromechanical relay (Type R, Series A2) with a 120 V coil designed for 50/60 Hz operation. This 120 V AC coil energizes to switch circuits in electrical control systems. The D40RB designation identifies its specific form factor within the Cutler-Hammer Type R family, making it a precise choice for applications requiring this relay configuration.
