The Red Dot 71R6121 low pressure switch with harness is designed to monitor low-side refrigerant pressure in mobile HVAC systems, particularly Bergstrom vehicle applications. It is a normally open switch that closes at 34 PSI and opens at 6 PSI, helping protect the system from operating under low-pressure conditions.
This switch features a 10 mm metric female fitting and includes an MxF spade connector with harness, providing a secure electrical connection and simplified installation. It is calibrated for R134a refrigerant, making it a dependable replacement for modern HVAC systems.
Use the specifications and interchange numbers below to confirm compatibility before ordering.
Product Specifications
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Part Type: Low Pressure Switch
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Red Dot Part No.: 71R6121
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MEI / AirSource Part No.: 1441
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OEM Reference: 404279
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Switch Type: Low side
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Operating Style: Normally open
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Opens At: 6 PSI
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Closes At: 34 PSI
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Function: Opens at low pressure, closes at high pressure
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Refrigerant Type: R134a
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Fitting: 10 mm metric female
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Electrical Connection: Male/Female spade connector with harness
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Application: Bergstrom vehicle HVAC systems
Cross Reference Numbers
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Texas Truck AC: 850-8002
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AirSource (MEI): 1441
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Bergstrom: 651108
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Blue Bird: 17538
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CoolStar (MEI): 910-1108
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Kysor: 2275003
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Kysor (Old): 404279
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Primatech: PTAC1441
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Roadforce: RF258B404768
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Truck Air (MEI): 21490
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TruckAC+: T4267
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TTA/C: 14-5404
Interchange Numbers
1441, 2275003, 404279, 404301, 11-2058, 20PS309-9, 651108, 850-8002, PTAC1441
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