A trinary pressure switch helps protect the system while also supporting stable A/C operation under changing conditions. The Red Dot 71R7550 is a Generation II trinary pressure switch designed to provide low-pressure protection, high-pressure shutdown, and fan or shutter override in mobile HVAC systems.
This switch threads directly onto a male Schrader-type valve using a 7/16-20 UNF-2B female thread, allowing for straightforward installation without refrigerant recovery. It is rated for up to 28V DC, with electrical ratings that support common mobile HVAC loads, making it a reliable choice for heavy-duty, on-highway, and vocational equipment applications.
Use the specifications and interchange numbers below to confirm the correct match before ordering.
Product Specifications
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Part Type: Trinary Pressure Switch (Generation II)
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Aftermarket Part No.: 71R7550
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Factory Part No.: RD-5-4583-0P
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Thread Size: 7/16-20 UNF-2B Female
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Install Style: Threads onto male Schrader-type valve
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Max Voltage: 28V DC
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Electrical Rating:
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7 AMP resistive
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4 AMP inductive
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Application: Mobile A/C systems requiring compressor protection and fan/shutter control
OEM & Interchange Numbers
OEM Numbers:
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Freightliner: A06-18015-000, RD-5-4583-0P
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Mack: 1MR3506P2, 4379-RD545830, 4379-RD559770
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Navistar: 1676658-C1
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PACCAR: 865700, 865700BSM, 86570P, K301-239, K301-313-1
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Western Star: 61522-3412
Aftermarket / Interchange:
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Texas Truck AC: 850-8952
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AirSource / MEI: 1560
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Alliance: ABP N83 318029, ABP N83 318149
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Bergstrom: 650633
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Climatech: BC1000, BC10000
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CoolCab: 901221
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CoolStar / MEI: 923-1008
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Euclid: E-807252
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Fleetrite: ZGG19280
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Four Seasons: 35901
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Kysor: 2299003 (404172 old)
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Motivaire: 44573
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Murray: 207094
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Primatech: PTAC1560
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Red Dot Aftermarket: 71R7550 (alt: 71R7715)
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Red Dot Factory: RD-5-5012-3
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Road Choice: SWI3308
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Roadforce: RF4756506662
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Truck Air / MEI: 44889
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TruckAC+: T6743
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TTA/C: 14-5327
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