These switches have been designed for lighter applications requiring precise switching, for equipment mounted in the open air subject to rain, dust etc, where the internal operation of the switch needs to be visible. The access to setpoint is internal, and can be sealed, yet the operation of the switch is visible due to the tough transparent polycarbonate cover. Typical applications are in industries like jet dyeing machines, water treatment plants etc, where the atmosphere can be humid, dusty, slightly corrosive and generally detrimental to general purpose switches.
