This Harmony XB4 modular black push button operates with a spring return / impulse mechanism.::It has a metal bezel.::This push button provides an ergonomic interface for controlling your machines.::It is easily installed into standard 22mm diameter panel cut-outs and connected to control circuits with classic screw-clamp connections.::Its schematic is clearly distinguishable thanks to clear colors and markings, minimizing errors during initial wiring and later maintenance operations.::It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66 / IP67 / IP69 / IP69K, making it ideal for operation in harsh environments.