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

Thermostats, type KP

Product speci€cation

Technical data

Table 1: General speci€cations

	Ambient temperature		-40 – 65 °C (80 °C for max. 2 hours)
	Switch		Single-pole, double-throw (SPDT) changeover switch
		Alternating current	AC1 = 16 A, 400 V
	Contact load		AC3 = 16 A, 400 V
		Direct current	DC13: 12 W, 220 V control current
		solid / stranded	0.75 – 2.5 mm2
	Wire dimensions	flexible, without ferrules	0.7 – 2.5 mm2
		flexible, with ferrules	0.5 – 1.5 mm2
	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

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

SPDT

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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 affords 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 differential is the difference between the make and break temperatures.

A differential is necessary for satisfactory automatic operation of the plant.

© Danfoss | Climate Solutions | 2021.07

AI287935082320en-000201 | 2