Danfoss KP 34, KP, KP 35, KP 36, KP 37 Data sheet
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Data Sheet
Pressure switches and thermostats
Type KP
For steam, air, gaseous and liquid media
KP Pressure Switches
Danfoss KP switches are used for regulating,
monitoring and alarm systems in the industry.
They provide automatic limit protection or
manual reset limit protection for pressure
systems. Can be used with steam, air, gaseous
and liquid media.
The pressure switches are tted with singlepole changeover switch (SPDT). The position of
the switch depends on the setting of the
pressure switch and the pressure in the
connector.
KP Thermostats
KP thermostats are temperature-operated
electric circuit breakers. The thermostats are
tted with single-pole changeover switch
(SPDT)
The position of the switch depends on the
thermostat setting and sensor temperature. A
KP thermostat can be connected and switch to
single-phase alternating current motors of up
to 2 kW.
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Key sketch of KP pressure switch
Simplied drawing of KP pressure switch without front cover and scale.
Version with manual reset.
Range setting spindle
Dierential setting spindle
Main arm
Main spring
Dierential spring
Bellows
Pressure connector
Contact system
Switch terminals
Ground terminal
Cable entry: ½ in female NPSM
Tumbler
Locking screw
Manual reset
Distance plate
Pressure switches and thermostats, Type KP
Features
• Wide regulating range
• Small dimensions
⁃ Space-saving, easy to install in panels
• Shock and impact resistant
• Ultra-short bounce time. Limits wear to an absolute minimum and increases reliability
• Snap action electrical contacts minimize chatter, bounce, and wear, and ensure long term electrical and
mechanical reliability
• Electrical connection from front of the unit. Makes rack mounting easier and also saves space
• Suitable for alternating current and direct current
• Screwed wiring, makes rewiring easy
• Manual trip allows electrical function test without tools
• Versions with automatic and manual reset available
Functions
Pressure switches
Table 1: Design and function
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 | 2
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15
Key sketch of KP 79, KP 81 thermostats
Simplied drawing of KP thermostat without front cover and scale.
Version with manual reset.
Range setting spindle
Dierential setting spindle
Main arm
Main spring
Dierential spring
Bellows
Temperature sensors
Contact system
Terminals
Ground terminal
Cable entry: ½ in female cable
gland
Tumbler
Locking screw
Manual reset
Distance plate
Pressure switches and thermostats, Type KP
Thermostats
Table 2: Design and function
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
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