This Harmony white light block operates with a universal LED. It is supplied with 110V to 120V AC and uses push-in terminal connections. It has a plastic body. It is compatible with Harmony XB4 and Harmony XB5 units. 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 push-in terminal connections. It enables visual distinction of signaling units via illumination by universal LED. It protects operators from unexpected contact with live circuits thanks to its IP20 protection index. It protects operators from unexpected contact with live circuits thanks to its IP20 protection index. This light block is sold by 5. Harmony delivers an innovative and ergonomic design that improves the reliability of panels, machines, and processes.