This Harmony ZB, light block without bulb operates with BA9s Base. It is supplied with 250V AC/DC and uses screw-clamp terminals. It has a plastic body. It is compatible with Harmony XB4 and XB5. This light block allows fast and easy replacement and configuration of your signaling units. It is easily installed and replaced on compatible illuminated push-button or selector switch units via clip together assembly and connected with simple screw-clamp connections. It enables visual distinction of signaling units via illumination by connected with BA9s base Integral LED. It protects operators from unexpected contact with live circuits thanks to its IP20 protection index. Its wide range of operating temperatures from -40C to 70C allows versatility in usage of product. Vibration resistant screw clamp connection terminals ensure high vibration resistance making product suitable installation on high impact machine.