JL5 serles clrcular connectors are made according to ministry of railway standard TB/T2716-1996.the connector’s socket is covered with guided stainless sleeve and allows the connector to have the advantages of low contact reslstance，long endurance，etc.the connection type between the plug and the receptacle is bayonet coupling with quick mating and easy use.this connector is wldely used for the connection of electrical equipment of rail train.the plug or the receptacle may be mounted with both pins and sockets.