pressure switch, industrial pressure switch, boiler pressure switch, current pressure switch, air pressure switch, low-pressure switch, electronic pressure switch, auto pressure switch, manual pressure switch, steam pressure switch, pressure switch for automobiles, refrigeration pressure switch, HVAC pressure switch, compressor pressure switch, differential pressure switch, oil pressure switch, liquid pressure switch. 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. Applications are HVAC, Industrial Applications, Air Conditioning Plants Refrigerating Systems, etc.