Danfoss Electronics KP, KPI Data Sheet

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 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 – 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

China Compulsory Certificate, CCC
(excluding boiler versions)
GOST (excluding KPI)

© Danfoss | DCS (az) | 2017.12

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 (az) | 2017.12 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 (az) | 2017.12 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 (az) | 2017.12 IC.PD.P10.F9.02 | 4

60-973.13.10

60-972.13.10

13 122

Danf

60-1355.11.10

Danf

60-1356.11.10

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

3

1

8

4

9

6

4

1

2

7

2

12

8

5

11

11

oss

oss

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 | DCS (az) | 2017.12

IC.PD.P10.F9.02 | 5