Differential oil pressure switch MP54 / MP55

MP54 / MP55 is an electromechanical differential oil pressure switch. It is mounted externally on the bearing cover and connected to the suction and pressure sides of the oil pump.

For the MP54, the connection is made with flexible hoses,
for the MP55A with pre-bent steel pipes – this also makes it suitable for the refrigerant R717 (ammonia).

Electromechanical differential oil pressure switch, example1: Evaluation device2: Electrical connection3: Suction pressure connection of the oil pump4: High pressure connection of the oil pump — Electromechanical differential oil pressure switch, example
1: Evaluation device
2: Electrical connection
3: Suction pressure connection of the oil pump
4: High pressure connection of the oil pump

Assembly MP55A (part no. 347 312 02)

Electromechanical differential oil pressure switch MP54 / MP55.
Variant	can be ordered as spare part assembly with part no.	Differential oil pressure switch
MP54 with flexible line for standard refrigerants	347 320 33	347 310 02
MP55 with flexible line without time relay for standard refrigerants and R290 / R1270	347 320 34	347 311 02
MP55A with steel pipe for R717 (compressors 2TA, 4TA)	347 320 25	347 311 03
MP55A with steel pipe for R717 (compressors 2NA, 4PA, 4NA)	347 320 26	347 311 03
MP55A with steel pipe for R717 (compressors 4HA .. 6FA and W4HA .. W6FA)	347 320 27	347 311 03
MP55A without relais, without line for R717 (compressors W4HA .. W6FA)	347 312 02	347 311 03

Examples for assemblies:

Assembly MP54 (part no. 347 320 33)

Assembly MP55 (part no. 347 320 34)

Assembly MP55 (part no. 347 320 25)

For details:

KT-170: Differential oil pressure monitoring, mounting and electrical connection