Contact arrangement for pre-insertion resistor

A contact arrangement for a pre-insertion resistor (PIR) comprising a control rod and a movable contact arranged to be moved along an axis, against a force of a biasing member, into temporary connection with the PIR, wherein the control rod is able to move the movable contact when mechanically coupled to the movable contact, and wherein the movable contact is arranged to decouple from the control rod, and return under the force of the biasing member, once a resistance to movement exceeds a predetermined value, wherein the control rod comprises a tulip with a plurality of resilient fingers, and the movable contact comprises a latching ring, the tulip having a first diameter operable to engage the latching ring to mechanically couple the control rod to the movable contact, the plurality of resilient fingers arranged to be deflected inwards such that the tulip is deformed to a second diameter, wherein the latching ring is able to pass over the tulip to decouple the movable contact from the control rod.