This Harmony XB4, black head with key (key no.421E) for key selector switch has 2 positions, operates with stay-put mechanism with key withdrawal on left and right position.This head with key provides a versatile interface for controlling your machines.It is easily installed and replaced on compatible complete key selector switch units to provide a secure manner for authorized staff to switch between process or machine operating modes.It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66.It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance.It is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery.Secure machine and system operation with a key, only available to authorized operators.Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.