Firestat Duct Limit Controls – Fixed Temperature


Keep your duct system safe with our high limit control switch.

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


Firestat 4PU DAYTON Plenum-mount Limit Control

Fixed Temperature, Manual Reset

The Firestat duct limit controls feature a helix bi-metal element with a manual reset that senses rapid increases in duct temperature.  The Bi-Metal causes the normally closed contacts to open and turn off the power.

The TC Firestat limit switches are available as a fixed temperature option – or as many know it as the 4PU Dayton Grainger Series. The fixed duct limit switch offers the same benefits as our other duct limit switches, but comes preset at the required temperature. Our standard fixed temperatures include, 125°F, 165°F or 200°F. See part number guide below. Other custom fixed temperature options are available, please contact us.

About our switches

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

These duct high temperature limits are indispensable in specialized HVAC applications and Building Automation Systems.

Find installation instructions here.

Our 4PU Duct Limit Controls are:

  • Fixed Temperature
  • Manual Reset
  • Open on Rise – SPST
  • 5″ Element Insertion Length
  • Inductive Amps @120V: 4.9; @240V: 9.8


For more information view our catalog pages or contact us!

Firestat Limit Controls Catalog RFQ firestat duct limit controls

Additional information

Weight 16 oz
Dimensions 11 × 8.5 × 5.5 in
Fixed Temperature

125°F, 165°F, 200°F


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