This unit is a current inverter for the 66361 and 60061 switched mode power packs to change the voltage from DC to AC or for connections with accessories using DC voltage. The AC voltage can be used for solenoid accessories that must be operated with alternating current, for crossing gates, and for supplying power to control units that only work with AC voltage (such as 6021, 6015, 6017). The DC voltage can be used to supply power to the layout lighting or for accessories or control units that use direct current. The front side of this converter has a hollow socket (for 66361) and a 4-conductor Mini-DIN high current plug (for 60061), and the rear side has one each DC and AC sockets. Dimensions 96 x 85 x 40 mm / 3-3/4" x 3-3/8" x 1-9/16".