This accessory consists of vertical rear connections for the 4-pole retractable ComPact NS 630b-1600 and Masterpact NT 06-16. They are adapted to the chassis of the withdrawal device. These vertical rear connections are designed for top mounting. They can be connected directly to flat or upright rails, depending on the position of the connections. Cables with lugs can be adjusted with some accessories. The distance is 70 mm and the width of the terminals is 44 mm. They are sold as a 4-piece set.