Red Dot 71R6050 Low Pressure Cutoff Switch – Normally Open (Closes at ~27 PSI)

The Red Dot 71R6050 low pressure cutoff switch is designed to protect mobile HVAC systems by monitoring low-side refrigerant pressure at the receiver-drier. It is a normally open switch that closes as pressure rises (approx. 27 PSI) and opens as pressure drops, helping prevent compressor operation when refrigerant pressure is too low.

This switch features 3/8″-24 UNF-2A male threads with an O-ring seal and two spade terminals, allowing for a secure, leak-resistant installation. It is commonly mounted on the drier and used across a wide range of heavy-duty truck and off-highway HVAC applications.

Use the specifications and interchange numbers below to confirm compatibility before ordering.

Product Specifications

• Part Type: Low Pressure Cutoff Switch

• Red Dot Part No.: 71R6050

• Red Dot Factory Part No.: RD-4191-0P

• Switch Type: Low side

• Operating Style: Normally open

• Closes At: ~27 PSI (on)

• Opens At: ~25 PSI (off)

• Function: Opens at low pressure, closes as pressure increases

• Mounting Location: Receiver-drier

• Fitting: 3/8″-24 UNF-2A male thread with O-ring

• Electrical Connection: 2 spade terminals

Cross Reference Numbers

• Texas Truck AC: 850-8618

• AirSource (MEI): 1430

• Alliance: ABP N83 318014

• Allis Chalmers: 70264650, 72162165-4

• Bergstrom: 540065

• Case IH: A47717

• Climatech: BB1000

• CoolCab: 901501

• CoolStar (MEI): 910-1038

• Delco: 15-193

• Euclid Industries: E-807347

• Fleetrite: ZGG12249, ZGG1850

• Four Seasons: 35752, 35758

• Freightliner: RDH RD4 1910

• Kysor: 2299005

• Kysor (Old): 404097

• Mack: 4379-RD41910

• Mobile Climate Control: 201-402

• Motivair: 17899, 33604

• Murray: 207068

• NDNS: 8510800, ABPN83318014, RDHRD41910

• Omega: 29-30000, 29-30002

• PACCAR: 318014BSM, 735203-1

• Parker: 085108-00

• Primatech: PTAC1430

• RoadForce: RF539B404945

• TRP / Climatech: BB10000

• Truck Air (MEI): 44875

• TruckAC+: T4252

• TTA/C: 14-5402

• Volvo: 3949309

• Red Dot (Aftermarket): 71R6050

• Red Dot (Factory): RD-4191-0P

Interchange Numbers

03-13034, 085108-00, 1-2249, 11-3010, 1430, 201-402, 207068, 2299005, 232-8461, 315315BSM, 35758, 3949309, 4379-RD41910, 4379-RD41910P, 540065, 70264650, 71R6050, 72162165-4, 850-8618, 910-1038, A47717, ABP N83 318014, BB10000, E-807347, RDHRD41910P, RDT71R6050, SWI1638, VS5347, ZGG12249, ZGG1850