Danfoss KP 35, KP 36, KPI 35, KPI 36, KPI 38 Data sheet
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Data sheet
Pressure switch and Thermostat
KP and KPI
The KP and KPI pressure switches and
thermostats are used for control, monitoring
and alarm systems in a wide variety of industry
applications.
KP pressure switches are mainly used for gaseous
fluid whereas KPI pressure switches are more
for liquid and gaseous fluid. The products
are available in IP30 enclosure as well as IP55
enclosure.
The KP pressure range include special designed
pressure switches and limiters for steam boilers
and other heating applications.
For water pump control and protection (dry run)
the dual pressure switch KP44 is suitable and
secure improved life time of the water pump.
Features • Wide setting range
• Shock and impact resistant
• Snap action electrical contacts minimize
chatter, bounce, and wear, and ensure long
term electrical and mechanical reliability
• Small dimensions - space saving and easy
to install in panels
• Electrical connection from front
of the unit makes rack mounting easier
and also saves space
• Suitable for alternating current
and direct current
• Single pressure switches and thermostats are
fitted with a single pole double throw contact
system (SPDT)
• Can be used for both liquids and gases (KPI)
Approvals CE-marked in accordance with LVD 2014/35/EU:
EN 60947-1, EN 60947-4-1, EN 60947-5-1
Underwriters Laboratories Inc., UL
• Manual trip function enables electrical
connections verification without any tools or
pressure changes in the application
• Versions with automatic and manual
reset available
• For demineralized water, there are special KP
models with wetted parts made of stainless
steel (AISI 316L)
China Compulsory Certificate, CCC
(excluding boiler versions)
GOST (excluding KPI)
© Danfoss | DCS (rm) | 2019.12
IC.PD.P10.F9.02 | 1
Data sheet | Pressure switch and Thermostat, KP and KPI
Technical data
Single pressure switch
Description KP 35, KP 36 KPI 35, KPI 36 KPI 38
Ambient temperature [°C] -40 – 65 °C (for max. 2 hours up to 80 °C)
Media temperature [°C] -40 – 100 °C
Fluid Gaseous media
Bellows
Parts in contact
with fluid
Contact system
Contact load, Silver
Contact load,
Gold plated contact set
Enclosure, IP30 grade
Enclosure, IP44 grade Mounted as IP30 plus fitting of top cover, code no. 060-109766
Enclosure, IP55 grade
Cable entry Rubber cable gland entry for 6 – 14 mm diameter cables
Mounted on back
plate / wall bracket
Mounted on angle bracket Not recommended in areas where vibrations occur
Pressure
connector
Phosphor bronze
or Stainless steel
Free-cutting steel
(nickel plated)
or Stainless steel
Single-pole double throw (SPDT)
Alternating current:
AC-1: 16 A, 400 V
AC-3: 16 A, 400 V
AC-15: 10 A, 400 V
Direct current:
DC-13: 12 W, 220 V
See information page 15
Unit must be mounted on a flat surface / a flat fitting and all unused holes
covered
Unit mounted in a special IP55 enclosure, code no.
060-033066 or 060-062866
Vibration proof in the range 0 – 1000 Hz, 4 g [1 g = 9.81 m/s2
Gaseous media and
liquids
Phosphor bronze Stainless steel
Brass Free-cutting steel (nickel plated)
Alternating current:
AC-1: 10 A, 440 V
AC-3: 6 A, 440 V
AC-15: 4 A, 440 V
Direct current:
DC-13: 12 W, 220 V
KP 34, KP 35, KP 36,
KP 37 boiler version
Steam, air, gaseous
media & liquids
Alternating current:
AC-1 : 16 A, 400 V
AC-3 : 16 A, 400 V
AC-15 : 10 A, 400 V
Direct current:
DC-13: 12 W, 220 V
© Danfoss | DCS (rm) | 2019.12 IC.PD.P10.F9.02 | 2
Data sheet | Pressure switch and Thermostat, KP and KPI
Ordering Pressure switch, types KP 35 and KP 36
Permissible
Typ e
Setting
range P
e
Differential
[bar] [bar] [bar] [bar]
-0.2 – 7.5 0.7 – 4.0 17 22 G 1⁄4 A silver
KP 35
-0.2 – 7.5 0.7 – 4.0 17 22 G 1⁄4 A gold-plated 060-50476 6
-0.2 – 7.5 0.7 – 4.0 17 22 G 1⁄4 A silver 060-538666 2)
-0.2 – 7.5 0.7 – 4.0 17 22 G 1⁄4 A silver 060-450366 3)
2.0– 14.0 0.7 – 4.0 17 22 G 1⁄4 A silver
2.0– 14.0 0.7 – 4.0 17 22 G 1⁄4 A gold 060-113 766
KP 36
2.0– 14.0 0.7 – 4.0 17 22 G 1⁄4 A silver 06 0-538766 2)
4.0 – 12.0 0.5 – 1.6 17 22 G 1⁄4 A silver 06 0-122166
4.0 – 12.0 0.5 – 1.6 17 22 G 1⁄4 A gold 06 0-114 4 66
4.0 – 12.0 0.5 – 1.6 17 22 G 1⁄4 A silver 06 0-450166 3)
1
) Available only in Asia market
2
) IP55 transparent enclosure
3
) Stainless steel version, IP55 non-transparent enclosure
Pressure switch, types KPI 35 – KPI 38
Setting
Typ e
range P
[bar] [bar] [bar] [bar]
-0.2 – 8.0 0.4 – 1.5 18 18 G 1⁄4 A silver 06 0-121766
KPI 35
-0.2 – 8.0 0.4 – 1.5 18 18 G 1⁄4 A gold-plated 060-3164 66
-0.2 – 8.0 0.5 – 2.0 18 18 G 1⁄4 A silver 06 0-1219 66
-0.2 – 8.0 0.4 – 1.5 18 18 G 1⁄4 A silver 060 -315766 1)
4 .0– 12.0 0.5 – 1.6 18 18 G 1⁄4 A silver 06 0-118966
KPI 36
4.0 – 12.0 0.5 – 1.6 18 18 G 1⁄4 A gold-plated 0 60 -113866
2.0 – 12.0 0.5 – 1.6 18 18 G 1⁄4 A silver 060-3169 66
2.0 – 12.0 0.5 – 1.6 18 18 G 1⁄4 A silver 06 0-3193 66 2)
KPI 38
1
) IP55 transparent enclosure
2
) IP55 non-transparent enclosure
8.0 – 28.0 1.8 – 6.0 30 30 G 1⁄4 A silver 060-508166
8.0 – 28.0 1.8 – 6.0 30 30 G 1⁄4 A silver 060-54186 6 2
e
Differential
operating
pressure P
Permissible
operating
pressure P
pressure
e
e
Max.
test
Max.
test
pressure
Pressure
connection
Pressure
connection
Contact
material
Contact
material
Code no.
060-113 366
060-113 391 1)
060-110866
060-110891 1)
Code no.
Pressure switch, types KP 34 – KP 37, boiler version
Typ e
KP 34
KP 35
KP 36
KP 37
Setting
range pe
Differential
Reset
[bar] [bar] [bar] [bar]
0.1 – 1.0 0.1 – 0.4 Automatic G 1⁄2 A 4.0 silver 0 60-216 466
0.1 – 1.0 0.2 Manual G 1⁄2 A 4.0 silver 060 -216366
0.4 – 3.4 0.4 – 2.2 Automatic G 1⁄2 A 10 silver 060-216666
0.4 – 3.4 0.5 Manual G 1⁄2 A 10 silver 060-216566
1.0 – 10.0 0.7 – 4.0 Automatic G 1⁄2 A 17 silver 060 -21596 6
1.0 – 10.0 0.7 Manual G 1⁄2 A 17 silver 060-216066
4.0 – 20.0 1.8 – 3.1 Automatic G 1⁄2 A 28 silver 060 -216166
4.0 – 20.0 3.0 Manual G 1⁄2 A 28 silver 060 -216266
Pressure
connection
Max. test
pressure
Contact
material
Code no.
© Danfoss | DCS (rm) | 2019.12 IC.PD.P10.F9.02 | 3
Data sheet | Pressure switch and Thermostat, KP and KPI
Contact system
and application
Setting
Switch type – single pole double throw Switch action Application
1. Terminal 1 – 4 close high and open low
SPDT
Terminal 1 – 2 can be used as low
pressure alarm
2. Terminal 1 – 2 open high and close low
Terminal 1 – 4 can be used as high
pressure alarm
1. Low pressure cut-out
2. High pressure cut-out
Diff.
Range
Note:
For low pressure switches
the restart pressure is equal
to cut-out pressure plus
differential value.
Cut-in and cut-out pressures of the system
should always be checked with an accurate
pressure gauge.
Pressure setting for switches with automatic
reset.
1. Set the cut-in pressure on the “CUT-IN”
scale (range scale).
2. Set the differential on the “DIFF” scale.
The cut-out pressure must be above absolute
vacuum (pe = -1 bar).
For high pressure switches the restart pressure
is equal to cut-out pressure minus differential.
Pressure switches with manual reset
Set the cut-out presure on the “CUT-OUT”
scale (range scale).
High pressure limiters can be manually reset
when the pressure is equal to the stop pressure
minus the differential.
© Danfoss | DCS (rm) | 2019.12 IC.PD.P10.F9.02 | 4
60-973.13.10
60-972.13.10
13 122
13
60-776.17.10
60-974.12.10
4 3 1 13 2 12
13 2 12
Data sheet | Pressure switch and Thermostat, KP and KPI
Design / Function
1. Setting spindle
2. Differential setting
spindle
3. Main arm
4. Main spring
5. Differential spring
6. Bellows
7. Pressure connector
8. Contact system
9. Connection terminals
10. Earth terminal
11. Cable entry
12. Omega spring (KPI)
12. Tumbler (KP)
13. Locking screw
14. Manual reset
Key sketch of KP pressure switch
4
3
1 13 2 12 8
5
4
9
10
6
7
Key sketch of KPI pressure switch
2 4 1
10
6
7
1
3
Danfoss
2
1
4
4
1
2
Danfoss
5
6
11
7
8
11
1
Danfoss
8
5
9
3
2
4
1
Danfoss
4
6
5
8
11
7
11
Key sketch of KP pressure switch, boiler version
3
3
1
2
4
10
6
7
The contact system in KP pressure switches has
a snap function. This means that the bellows
is active only when the cut-in or cut out value
is reached.
The bellows is connected to the pressure of the
controlled plant via the connector (7).
4 1
14
11
Danfoss
60-1356.11.10
3
1
8
4
9
6
4
1
2
7
Danfoss KPI pressure switches are designed
so that the bellows moves in the same
proportion as the pressure switches change.
To ensure a snap function on contact change
over, an omega spring is located between
bellows and contact system.
Danfoss
60-1355.11.10
2
12
8
5
11
© Danfoss | DCS (rm) | 2019.12
IC.PD.P10.F9.02 | 5
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