MAIN CHARACTERISTICS range of product HARMONY XB4 product or component type HD F NON-ILLUM PUSHBUTTON device short name ZB4 mounting diameter 22 MM sale per indivisible quantity 1 shape of signaling unit head ROUND operator profile FLUSH COMPLEMETARY CHARACTERISTICS mechanical durability 10000000 CYCLES main group PUSHBUTTON group of product FLUSH UNMARKED marking UNMARKED compatibility code ZB4