Pressure Switches

Thermostat KP

The KP Thermostats are single-pole, double throw
(SPDT) temperature-operated electric 
switches. They can be connected directly to a single-phase 
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. They are available with vapour charge or with With vapour charge the differential is very small. The KP Thermostats with adsorption charge are widely used to give frost protection.

Features and benefits

  • Wide regulating range
  • Can be used for deep freeze, refrigeration and air conditioning plant
  • Welded bellows elements mean increased reliability
  • Small dimensions. and Easy to install in refrigerated counters or cold rooms
  • 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
  • Extensive and wide range

KP Pressure Switch

KP pressure switches are for use in refrigeration 
and air conditioning systems to give protection 
against excessively low suction pressure or 
excessively high discharge pressure. KP pressure switches are also used for starting 
and stopping refrigeration compressors and fan s
on air-cooled condensers. A KP pressure switch can be connected directly 
to a single-phase AC motor of up to approx. 2 kW 
or installed in the control circuit of DC motor s
and large AC motors. KP pressure switches are fitted with a single-pole double-throw (SPDT) switch The position of the switch is determined by the pressure switch setting and the pressure at the connector KP pressure switches are available in IP30, IP44 and IP55 enclosures.

Features and benefits

  • Ultra-short bounce time thanks to snap-action function (reduces wear to a minimum and increases reliability)
  • Manual trip function (electrical contact function can be tested without the use of tools)
  • Types KP 6, KP 7 and KP 17 with fail-safe double bellows element
  • Vibration and shock resistant
  • Compact design
  • Fully welded bellows element
  • High reliability both electrically and mechanically

RT Pressure Switch Differential

An RT pressure switch contains a pressure operated single-pole changeover contact, the position of which depends on the pressure in the inlet connection and the set scale value. The RT series includes pressure switches for general applications within industrial and marine refrigeration. The RT series also includes differential pressure switches, pressure switches for neutral zone regulation, and special pressure switches with gold-plated contact surfaces for PLC applications

Features and benefits

  • Versions with enclosure IP66
  • Wide regulating range
  • Wide range of units for industrial and marine applications
  • Suitable for alternating and direct current (AC and DC)
  • Interchangeable contact system
  • Special versions for PLC applications
  • Safety Integrity Level : SIL 2 according to IEC 61508

MP Differential Pressure Switch

MP 54 and MP 55 oil differential pressure switches are used as safety switches to protect refrigeration compressors against low lubricating oil pressure. If the oil pressure fails, the oil differential pressure switch stops the compressor after a certain time period. MP 54 and MP 55 are used in refrigerating systems using HCFC and non-flammable HFC refrigerants. MP 55A is used in refrigerating systems with R717. MP 55A can also be used in systems with HCFC and non-flammable HFC refrigerants. MP 54 has a fixed differential pressure setting. It also incorporates a thermal time relay with a fixed release time setting. MP 55 and MP 55A have adjustable differential pressure and are available both with and without thermal time relay.

Features and benefits

  • Wide regulating range
  • Can be used for deep freeze, refrigeration and air conditioning plant
  • Can be used for HCFC and non-flammable HFC refrigerants
  • Electrical connection at the front of the unit
  • Suitable for both alternating and direct current (AC and DC)
  • Screwed cable entry for cables from 6 – 14 mm diameter
  • Small contact differential