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For dividing a track or accessory circuit into 4 different circuits, each with two connections. For example, 4 storage sidings in the same track circuit or 4 users in the same accessory circuit can be turned on and off. Unit comes with 8 sockets on the back and 2 sockets on the ends. All of the connections are for the new plugs from the 71400 sets. 8 appropriate plugs included. Dimensions 80 x 40 mm / 3-1/8” x 1-9/16”.