Mushroom shaped knobs EN 77 are used for switching in the radial direction. Their size and shape make them easy and safe to grip with the entire hand, meaning that higher operating forces can be transmitted.
The mushroom shaped knobs of phenolic resin have good resistance to chemical influences.
Specification
Plastic, Phenolic (PF)
Operating temperature
-4 °F to +230 °F (-20 °C to +110 °C)
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Original design 
