This Harmony XB5 lighting block with housing/fixing ring for BA9s bulb is supplied with 250VAC/dc and has screw terminals. It has 1 x normally closed contact and a plastic housing and is compatible with the Harmony XB5 indicator lights. This light block allows for quick and easy replacement and configuration of your signalling devices. It is easy to install and replace on compatible illuminated pushbuttons or selector switch units via a plug-in assembly and connects with simple screw terminal connections. It allows visual differentiation of signalling devices via the illumination in conjunction with the BA9s base Integral LEDIt protects the operator from unexpected contact with live circuits thanks to the IP20 protection index.