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Bard 8402-078BX - Limit Control L175-30 7 Inch

The Bard 8402-078BX is an OEM limit control used to monitor and protect Bard HVAC equipment by opening the control circuit when temperature exceeds its set limit, helping prevent overheating during heating operation. This 7 inch style limit control is commonly referenced as an L175-30 control, meaning it is associated with a 175F limit setting and a 30F differential, making it a key safety and temperature management component in compatible Bard wall-mounted units and related equipment. If you are replacing a failed or out-of-spec limit, using the correct Bard part number helps ensure proper fit, correct sensing depth, and reliable system operation the way the unit was engineered.


  • Technical Specifications
  • Product number: 8402-078BX
  • Manufacturer description: Limit Control L175-30 7"-Boxed
  • Weight: 0.300 lbs
  • HTS Code: "9032.10.0030"

  • Previous Versions
  • 8402-078 (Obsolete, superseded by 8402-078BX)

$19.00 *

* 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.