Relay socket is pre-wired with 5 color-coded wire leads. Socket is a molded base 5 pole design. Fits all of our 40 amp, 50 amp, and 60 amp relays. The three power leads are 14 gauge wire and the other two wires are 16 gauge. If you need to switch higher currents than 30 amps, then connect directly to the relay with a push-on connector instead of a socket.