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Bard 8406-140BX - Low Pressure Switch 40 PSIG

The Bard 8406-140BX is an OEM low pressure refrigerant safety switch set for a 40 PSIG cutout, used on Bard wall-mounted air conditioners and related packaged equipment to help protect the compressor when system suction pressure drops from low charge, airflow restrictions, or a developing leak. When pressure falls below the switch setting, it opens the control circuit to prevent continued operation under damaging conditions, and it allows normal cooling to resume once pressure returns to an acceptable range. If you are troubleshooting nuisance trips, confirm correct refrigerant charge, coil cleanliness, airflow, and wiring connections before replacement, then match the original switch style and pressure rating to ensure proper system protection.


  • Technical Specifications
  • Product number: 8406-140BX
  • Manufacturer description: Low Pressure Switch 40PSIG-Boxed
  • Weight: 0.400 lbs
  • HTS Code: "8415.90.8085"

  • Previous Versions
  • 8406-140 (Obsolete, superseded by 8406-140BX)

$27.00 *

* Orders less than $50 may incure a minimum order fee.

What does the "BX" suffix mean?

Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.

A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.

Example: 8406-142BX is physically identical to 8406-142.