The S14 range of low cost industrial switches comprise of 3 basic types

1) S14 - This is an office or comms room rated switch with temperature specification from 0 to +40°C
2) S14H - A hardened version built with high-grade components using special thermal techniques (patent pending)
suitable for factory floor tasks in environments ranging from -20 to +60°C
3) S14P - Premium rated, as above but for temperature un-controlled environments such as roadside & trackside cabinets or environmental monitoring tasks. The -40 To +75°C operating temperature allows operation in almost any environment.