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Fenwal Thermoswitch Controllers
Series 17300 - Flange Head Style
The Fenwal Thermoswitch Temperature Controller is a 5/8" diameter flange head mechanical thermostat with an adjustable temperature set point. The Series 17300 has all the features of the Block Head Type and also a 3-hole mounting flange.
Principle of Operation:
The Fenwal Thermoswitch controller is a strut-and-tube type thermostat comprised of two basic parts: the outer shell, made of high-expanding metal and the strut assembly made of low-expanding metal. A pair of electrical contacts is mounted on the strut assembly and installed in the shell under tension. The temperature at which the contacts "make" or "break" can be regulated by a temperature adjusting sleeve.
Fast Response:
Because the outer shell of the Thermoswitch controller is the active sensing member, and not merely a housing, response to temperature change is almost instantaneous.
Close Control:
The controller's shell and strut arrangement has "anticipation" characteristics which substantially reduce the amount of overshoot and undershoot during conditions of rapid temperature change.
Extreme Sensitivity:
The strut and contact assembly operates by slow make and break. This means that every temperature change, no matter how small, causes a corresponding change in the space between the electrical contacts. Therefore, contact action can be produced by a very small temperature change, which accounts for the Thermoswitch controller's excellent resolution os 0.1ºF (0.05ºC).
Agency Approval:
Various models are listed to component recognized by Underwriters Laboratories (UL) and certified by the Canadian Standards Association (CSA).

Specifications & Options:
  • Shell dimensions: 5/8" diameter, 3-9/16" long (3" long on units with threads)
  • Standard lead wire: 8-10 inches
  • Maximum volts: 240VAC / Vdc consult factory
  • Maximum watts: 1200 AC / Vdc consult factory
  • Maximum operating temperature: 600ºF / 316ºC
  • Minimum operating temperature: -100ºF / -73ºC
  • Contact action: slow make and break
  • Options (call for pricing and applicability to specific models):
    • Special Marking
    • Extended Lead Wires
    • Factory Temperature Setting
    • Temperature Restraining Device
    • Tamper-Proof Cap
    • Dial and Knob
    • Moisture Resistant Seal & Moisture Resistant Tamper Proof Cap
    • Armored Cable (over lead wires)
    • Terminal Plug Connector
    • Extended Temperature Adjusting Sleeve
    • Protective Wells

Download Fenwal Thermoswitch Datasheet (pdf 700K)

NOTE: All brass thermoswitches have been discontinued. Quantities limited to stock on hand. Please call for availability.
Part No. Description Diameter Temp. Range Contact
Operation
on Temp Rise		 Shell
Material		 Price Order Quantity
01-017300-000** Fenwal Flange Head Thermoswitch 5/8" -100 to 400ºF Opens Brass Discontinued, use
01-017302-00 below
01-017321-000** Fenwal Flange Head Thermoswitch 5/8" -100 to 400ºF Closes Brass Discontinued, use
01-017323-00 below
01-017302-000 Fenwal Flange Head Thermoswitch 5/8" -100 to 600ºF Opens 300SS $312.00   Enter qty:  
01-017323-000 Fenwal Flange Heard Thermoswitch 5/8" -100 to 600ºF Closes 300SS $364.00   Enter qty:  
Some items in stock. Out-of-stock items take 1-3 weeks. Please call for availability.
** Discontinued item. Quantities limited to stock on hand. Call for availability.
This page last modified on 1/8/2024
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