Danfoss 060B017291 MP55 Differential Pressure Switch for Refrigeration Systems

The Danfoss 060B017291 MP55 is an oil differential pressure switch designed as a safety control to protect refrigeration compressors against low lubricating oil pressure. This switch monitors the pressure difference between the oil pump discharge and crankcase pressure, shutting down the compressor if adequate oil pressure is not maintained.

Key Features:

• Differential pressure setting range: 0.30 to 4.50 bar (4.3 to 65.2 PSI)
• Manual minimum reset function for enhanced safety
• 1/4 inch flare connection with male fittings
• Maximum working pressure: 17 bar (247 PSI)
• IP20 enclosure rating for indoor applications
• Compatible with R717 (ammonia), HCFC, and non-flammable HFC refrigerants

Ideal for use in deep freeze, refrigeration, and air conditioning systems. The MP55 incorporates a thermal time relay that allows brief pressure drops during startup while protecting against sustained low oil pressure conditions that could damage the compressor.