Liquid interrupter module

A current interrupter comprising:

• an enclosure, a fixed contact in said enclosure, a movable contact in said enclosure, said movable contact being movable into electrical contact with said fixed contact, a dielectric located within said enclosure wherein the temperature and pressure conditions are such that said dielectric exists in a gaseous form in the upper part of said enclosure and in a liquid form in the lower part of said enclosure, a boundary being defined between the gaseous form and liquid form of said dielectric, a cylinder positioned in the lower part of said enclosure to be below the boundary defined by the gaseous form and liquid form of said dielectric, a pump piston supported movement in said cylinder, a flow passageway extending from an opening of said cylinder to said fixed contact to establish fluid communication therebetween for the flow of the liquid form of said dielectric into the vicinity of said fixed contact, a first check valve in said flow passageway for permitting unidirectional flow from said cylinder to said fixed contact, a refill passage in said enclosure for establishing fluid communication between said cylinder and the liquid form of said dielectric for refilling said cylinder with the dielectric liquid, and means for moving said pump piston and said movable contact to separate and reclose said contacts and to drive said pump piston in said cylinder, said pump piston forcing the liquid form of said dielectric through said flow passageway upon contact separation and drawing the liquid form of said dielectric into said cylinder by way of said refill passage upon contact reclosure.