Danfoss KP 78, KP 79, KP Data sheet

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 specication

Technical data

Table 1: General specications

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 aords 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

Dierential

The dierential is the dierence between the make and break temperatures.
A dierential is necessary for satisfactory automatic operation of the plant.

© Danfoss | Climate Solutions | 2021.07 AI287935082320en-000201 | 2