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 54 has a fixed differential pressure setting and MP 55 and has an adjustable differential pressure setting. Both incorporate a thermal time relay with a fixed release time setting of 90 seconds.
Manual reset with push button on top of switch.