Wire spring relay
![A pair of wire spring relays in one frame, called a](/Images/godic/202502/21/AK1_wire_spring_relay4136.jpeg")
A wire spring relay is a type of relay, that has springs made from drawn wires of phosphor bronze, rather than cut from flat sheet metal as in the flat spring relay. It provided greater reliability than other types of relays. Wire spring relays entered mass production in the early 1950s.