The Schneider Electric selector Harmony ZB4 key switch head works with XB4 switches. Schneider Electric offers a range of Harmony ZB4 series key switch heads with black handles and a range of positions.
Made of round and chrome-plated metal, it is highly durable, easy to set up, flexible and robust.
Each switch head has an ingenious locking system with a snap-on head and body that tightens the head with a single screw for secure