DANFOSS DIFFERENTIAL PRESSURE SWITCHES MP 54, MP 55 AND MP 55A
Differential pressure switch MP 54, MP 55 and MP 55A
MP 54 and MP 55 differential oil pressure switches are used as safety switches to protect refrigeration compressors against low lubricating oil pressure in the refrigeration compressor. If the oil pressure is too low, the oil differential pressure switch switches off the compressor after a certain time. MP 54 and MP 55 are used in refrigeration systems that use HCFC and non-flammable HFC refrigerants. MP 55A is used in refrigeration 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 and a thermal time relay with a fixed tripping time. MP 55 and 55A have an adjustable differential pressure and can be supplied with or without a thermal timer.