22mm Enclosed Control Stations Schneider Electric 22mm Enclosed Control Stations include metal control stations represented by the XAP and XB2 series and plastic control stations represented by the XALD and XALK series. The plastic control stations are suitable for most common functions, including start, stop, start-stop, and emergency stop. The XALD series is fitted with one, two, or three operators from the Harmony® XB5 range, while the XALK series features a mushroom head pushbutton for an emergency stop function.