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Gray snap-disc fan switch, compact rectangular housing, 120 to 277 V

Value Brand

Value Brand Fan Switch 140°F Close 120-277V

SKU CH-CQ4C-EJMH8

A snap-disc fan control that closes on temperature rise at 140 °F and opens at 120 °F, rated for 120 to 277 V circuits

  • Automatically activates fan at 140°F to prevent overheating
  • Deactivates fan at 120°F for energy-efficient operation
  • Compatible with 120-277V systems for versatile installation
  • 20°F differential prevents short cycling and extends equipment life
  • Snap disc SPST design ensures reliable temperature control

HVAC Fan Switch 140°F Close

This ZORO SELECT snap-disc control activates a fan when the temperature reaches 140 °F and opens again at 120 °F. It operates on 120 to 277 V circuits and uses a SPST close-on-rise action. The compact housing fits standard HVAC mounting locations.

Ideal for Single-Stage Fan Control

Technicians maintaining residential or light-commercial air handlers will find the 20-degree differential suitable for basic cycling. Installers needing adjustable set-points, multi-speed logic or lower voltage DC operation should look at other control types.

140 °F Close / 120 °F Open Set-Points

The fixed close-on-rise temperatures of 140 °F and 120 °F are the decisive specification; verify they match the equipment manufacturer's recommended fan-on and fan-off points before purchase.

Highlights

  • Automatically activates fan at 140°F to prevent overheating
  • Deactivates fan at 120°F for energy-efficient operation
  • Compatible with 120-277V systems for versatile installation
  • 20°F differential prevents short cycling and extends equipment life
  • Snap disc SPST design ensures reliable temperature control

Specifications

BrandZORO SELECT

Questions about this item

How often does the snap-disc mechanism need checking or replacement after repeated cycling?

The snap-disc is a sealed thermal element with no user-serviceable parts; it operates at a 20 °F differential between 140 °F close and 120 °F open, so no scheduled replacement is required under normal HVAC duty.

What is the first limit reached when the switch runs continuously at full 10 A inductive load?

The contact rating of 10 A at 120 V AC and 5 A at 277 V AC is the primary limit; sustained operation at those currents will reach the switch’s electrical endurance before any thermal limit.

How much heat does the switch body add to the duct when it stays closed all day?

Power dissipation is approximately 21.6 W when conducting rated current, and the compact 1 1/2 × 1 3/4 × 1 in housing transfers that heat directly into the surrounding air stream.

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