Data Sheet
Thermostats
Type KP
For district heating substations
The KP thermostats are single-pole, doublethrow (SPDT) temperature-operated electric
switches.
They can be connected directly to a singlephase AC motor of up to approx. 2 kW or
installed in the control circuit of DC motors and
large AC motors.
The KP thermostats are used for regulation, but
can also be seen in safety monitoring systems.
Features
• Wide regulating range
• Welded bellows elements mean increased
reliability
• Small dimensions
• Ultra-short bounce times. This gives long
operating life, reduces wear to a minimum
and increases reliability
• Standard versions with changeover switch.
Possible to obtain opposite contact function
or to connect a signal
• Electrical connection at the front of the unit
◦ Facilitates rack mounting
◦ Saves space
• Suitable for alternating and direct current
• Cable entry of soft thermoplastic for cables
from 6 to 14 mm diameter
AI287935082320en-000201
Ambient temperature
-40 – 65 °C (80 °C for max. 2 hours)
Switch
Single-pole, double-throw (SPDT) changeover switch
Contact load
Alternating current
AC1 = 16 A, 400 V
AC3 = 16 A, 400 V
Direct current
DC13: 12 W, 220 V control current
Wire dimensions
solid / stranded
0.75 – 2.5 mm
2
exible, without ferrules
0.7 – 2.5 mm
2
exible, with ferrules
0.5 – 1.5 mm
2
Tightening torque
max. 2 Nm
Rated impulse voltage
4 kV
Pollution degree
3
Short circuit protection, fuse
16 A
Insulation
400 V
Enclosure
IP55
Nominal pressure
PN 16
Sensor material
Stainless steel 1.4404
SPDT
Thermostats, type KP
Product specication
Technical data
Table 1: General specications
Cable connection
Cable entry for cables 6 – 14 mm dia.
A Pg 13.5 screwed cable entry can be used for 6 – 14 mm dia. cables.
With 8 – 16 mm cables a standard Pg 16 screwed cable entry can be used.
Enclosure
IP55 to EN 60529 / IEC 60529
This grade of enclosure is obtained when the unit is mounted in an IP55 enclosure.
Contact systems
Figure 1: KP temperature control
Design Function
The switch in the KP has a snap-action function and the bellows move only when the cut-in or cut-out value is
reached.
The design of the KP thermostats aords the following advantages:
1.
High contact load
2.
Ultra-short bounce time
3.
Vibration resistance up to 4 g, in the range 0 – 1000 Hz
4.
Long mechanical and electrical life
Terminology
Dierential
The dierential is the dierence between the make and break temperatures.
A dierential is necessary for satisfactory automatic operation of the plant.
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9
19
17
91719
Bellows element
Sensor (bulb)
Capillary tube
Thermostats, type KP
Mechanical dierential (intrinsic dierential)
The mechanical dierential is the dierential set by the dierential spindle.
Operating dierential (thermal dierential)
The operating dierential is the dierential the plant operates on. Operating dierential is the sum of the
mechanical dierential and the dierential produced by the time constant.
Reset
These units are automatically reset after operational stop.
Setting
Set the upper activating temperature on the range scale.
Set the dierential on the "DIFF" scale.
The temperature setting on the range scale will then correspond to the temperature at which the 1-2 contacts will
brake by rising temperature.
The 1-2 contacts will make when the temperature has fallen in relation to the dierential setting.
Note that the dierential depends on the range setting. Therefore, the dierential scale must only be used as
guideline.
If with low stop temperature settings the 1-2 contacts will not make, check whether the dierential is set at too high
a value!
Charge
Figure 2: Adsorption charge
The charge consists partly of a superheated gas and partly of a solid having a large adsorption surface.
The solid is concentrated in the sensor (17) and it is therefore always the sensor that is the temperature-controlling
part of the thermostatic element.
The sensor can be placed warmer or colder than thermostat housing and capillary tube, but variations from 20 °C
ambient temperature will inuence the scale accuracy.
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Danfoss
60-3000.10
103 mm
[4 in]
224 mm
[8
7
/
8
in]
110 mm
[4
3
/
8
in]
HEX 22 mm
[7/8in]
ø 15 mm
[ø5/8in]
G1/
2
83 mm
[3
1
/
4
in]
102 mm
[4 in]
61 mm
[23/8in]
Thermostats, type KP
Dimensions [mm] and weights [kg]
Figure 3: KP 78 – 79
Net weight: approx. 0.4 kg
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1
1
Reset button
Charge
Type
Sensor type
Setting range
Dierential Δt
Reset
Max. sensor
temp.
Sensor pocket
length
Code no.
Lowest tem‐
perature
Highest tem‐
perature
[°C]
[°C]
[°C]
[°C]
[mm]
Adsorbtion
(1)
KP 78
Rigid sensor
30 – 90
4.5 – 20
7.0 – 16.5
Automatic
150
110
060L122966
KP 79
Rigid sensor
50 – 100
5.0 – 15
5.0 – 15
Automatic
150
110
060L127466
KP 79
Rigid sensor
50 – 100
Fixed 5.5
Fixed 5.5
Manual (Max.)
150
110
060L128166
File name
Document type
Document topic
Approval authority
BK_W_0862_01_2018
Food and Health - Performance
Certi-
cate
-
PZH
RU Д-DK.ГА02.В.03367
EAC Declaration
EMC
EAC
RU C-DK.БЛ08.В.00063_18
Electrical - Safety
Certicate
EMC/LVE
EAC
ELE-086320XG-003
Marine - Safety
Certicate
-
RINA
UA.1O146.D.00075-19
UA Declaration
EMCD/LVD
LLC CDC EURO TYSK
Thermostats, type KP
Ordering
Table 2: Thermostat, types KP 78 and KP 79
(1)
(1)
Bulb can be placed warmer or colder than thermostat housing and capillary tube, but variations from 20 °C ambient temperature will inuence
Bulb can be placed warmer or colder than thermostat housing and capillary tube, but variations from 20 °C ambient temperature will inuence
the scale accuracy
the scale accuracy
Figure 4: KP 79 with manual reset
Certicates, declarations and approvals
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
Certicates and declarations
Table 3: Certicates and declarations
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