Firestat Duct Limit Controls – Adjustable Temperature 7.5″ Insertion Rod



Firestat, Plenum-mount Limit Control

Adjustable Temperature, Manual Reset

The adjustable temperature duct limit switch features a helix bi-metal element that senses rapid increases in temperature, such increases often caused by fire in a HVAC duct system. These duct high temperature limits are indispensable in specialized HVAC applications and Building Automation Systems.

About our switches

  • Made in U.S.A
  • Easy to Install
  • UL Approved
  • More affordable than competitors

Find installation instructions here.

Our adjustable temperature limit switch features:

  •  Adjustable Temperature range 100F-250F
  •  Manual Reset (requires human intervention to reactivate switch after high temperature condition has cleared)
  •  Multiple Element Insertion Lengths
  •  Open on Rise – SPST
  •  Inductive Amps @120V: 4.9; @240V: 9.8


Different bi-metal element lengths are available per the application requirements – 5″, 7.5″, or 11″.  Choose the preferred length from the drop down above. Other custom lengths are available, please contact us.


For more information view our catalog pages or contact us!

Additional information

Weight 16 oz
Dimensions 11 × 8.5 × 5.5 in
Insertion Length

7.5 inches, 5 inches, 11 inches


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