The Hongfa 49F is a series of relay sockets and accessories that are RoHS compliant. The series feature a wide range of relay sockets and accessories designed to meet most applications. Features include universal PC board mounting, plug-in terminal design, increased power ratings, improved contact arrangement, and a built-in Y2 straight type terminal. This series also has a wide variety of accessories to accommodate different applications, including DIP switches, LEDs, and pilot lamps. This series is designed to be used in applications ranging from controlling circuits, relaying signals, to isolation and interfacing circuits.