The SSR-40048ZD1B is an electronic relay manufactured by QLT Power, which utilizes a solid state design and operates with a control voltage of 4 to 16 Volts (V) DC. It is capable of handling an impressive 400 Amps (A) and can handle an operating voltage of 44 to 480 Volts (V) AC. This relay is part of the SSR-Z series and is suitable for many applications, such as motor controls, lighting and power controls, or switching of other loads. The SSR-40048ZD1B is designed with high surge protection to increase the life of the relay, and also features overload protection, reverse polarity protection, noise immunity and current limit protection.