Danfoss MP 55A Differential pressure switch

In stock


Danfoss MP 55A Differential Pressure Switch have adjustable differential pressure and are available both with and without thermal time relay. MP55A has a fixed differential pressure setting. It also incorporates a thermal time relay with a fixed release time setting.

Applications: Steam boiler plant, control systems in factories, diesel plants, compressors, power stations, and onboard ships.

Danfoss MP 55A differential pressure switch 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 55A is used in refrigerating systems with R717. MP 55A can also be used in systems with HCFC and non-flammable HFC refrigerants.

Features of Danfoss M55A Differential Pressure Switch:

  1. Wide regulating range.
  2. Can be used for deep freeze, refrigeration and air conditioning plant.
  3. Electrical connection at the front of the unit.
  4. Screwed cable entry for cables from 6 – 14 mm diameter.
  5. Small contact differential.

Additional information



Model No


Measuring Parameters

Differential Pressure

Ambient Temperature

-40 – 60 °C


230 V or 115 V AC or DC

Permissible voltage variation

-15 – 10%

Working Pressure

PS/MWP = 17 bar


Pe = 22 bar

Cable Entry

P 13.5

Cable Daimeter

6 – 14 mm

Housing Material

IP20 to EN 60529 / IEC 60529



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Danfoss MP 55A Differential pressure switch

Danfoss MP 55A Differential pressure switch