Schneider XB4 Flush Mounting Kits Schneider Electric XB4 Flush Mounting Kits provide a means of flush mounting Harmony XB4 series push buttons and selector switches. The flush mounting kits provide a quick and easy installation in a 30.5 mm hole, compatible with 22 mm devices. Flush mounting kits bring a stylish aesthetic to a control panel. Also ensuring maximum safety for people and installations, as it cannot be dismantled from the front. Quick and easy installation Control devices and the operating modes of the machine do not change Stylish aesthetic, bringing a new look to your control panel Flexibility to suit a wide range of applications Schneider Electric ZB4-B & XB4-B Harmony® 22mm Range