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Thermostats
Table 2: Design and function
Key sketch of KP 79, KP 81 thermostats
Simplied drawing of KP thermostat without front cover and scale.
Version with manual reset.
Range setting spindle
Dierential setting spindle
Main arm
Main spring
Dierential spring
Bellows
Temperature sensors
Contact system
Terminals
Ground terminal
Cable entry: ½ in female cable
gland
Tumbler
Locking screw
Manual reset
Distance plate
The contact system of KP switches has a snap-action function and the bellows moves only when cut-in or cut-out
set point is reached.
The design has the following advantages:
• higher contact load
• ultra short bounce time
• long mechanical and electrical lifetime
• high resistance to vibrations and pulsations
© Danfoss | Climate Solutions | 2021.02 AI209986438809en-000602 | 3
Pressure switches and thermostats, Type KP