Series 40T/40M Digital Temperature Switch

Brand: Dwyer Instruments, LLC

The Series 40T/40M Digital Temperature Switch accepts a variety of inputs to allow temperature measurements and set points up to 1999°F (1300°C).

Observing the current status of the control is made easier with the 3-1/2 digit, multi-color LED display that has alarm, defrost and output symbols. 

For added versatility, the temperature units can be field selected for °F or °C. For cooling applications, manual defrost mode can be initiated by pushing a single button. A flashing alarm informs users when the current temperature exceeds preset limits.

When programming multiple units, a programming key is available to reduce set up time.
  • Field Selectable °F or °C
  • Universal Temperature Sensor or Transmitter Input on 40M Models
  • Configuration Key to Quickly Load Parameters from One Unit to Another
  • Heating or Cooling Models



  • ± 1 % of Full Scale

Ambient Temperature Range

  • 0° to 55° C (32° to 131° F)

Approvals & Certifications

  • CE
  • cUL


  • 3-1/2” Digital Red Display

Environmental Protection

  • IP65


  • 16 A @ 250 Vac, Max.

Power Requirement

  • 115 Vac
  • 12-24 Vac
  • 230 Vac


  • 0.1° C

Set Point - Decreasing

  • -200° to 1300° C (-328° to 2372° F)

Set Point - Increasing

  • -200° to 1300° C (-328° to 2372° F)

Switch Type

  • SPDT Relay

  • Food Service Equipment
  • Industrial Process Control
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