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  • Probe Range:
    • PTC: -58 to 302°F (-50 to 150°C)
    • NTC: -58 to 230°F (-50 to 110°C)
  • Input:
    • PTC (1000Ω @ 25°C)
    • NTC (10KΩ @ 25°C)
  • Output: R1 SPDT relay resistive load: 20A @ 240 VAC; R2 SPDT relay resistive load: 8A @ 240 VAC; Inductive load: 3A @ 240 VAC
  • Horsepower Rating: R1 2HP @ 240 VAC
  • Control Type: On/off
  • Power Requirements: 90 to 255 VAC or 12 to 24 VAC/VDC (±10%) depending on model
  • Power Consumption: 3.6VA
  • Accuracy: ±1% FS
  • Display: 3 digits plus sign
  • Resolution: 0.1° < 100°; 1° ≥ 100°
  • Non-volatile memory
  • CE, cUR, UR approved
  • NEMA 4X (IP66) front panel


The Dwyer TSW Digital Temperature Switch combines trusted, reliable technology and an installation friendly weatherproof enclosure. The TSW can be quickly completed using the front keypad or by using the TS2-K configuration key. In order to prevent tampering from unauthorized users, a parameter lock physical jumper and software passcode security are standard in the unit. The bright, easy-to-read LED display shows the current output status and the temperature measurement. The multiple conduit knockouts on the Series TSW give flexibility to the installer to determine the best location for the conduit entry. Another installation friendly feature of the Series TSW is the ability to quickly jumper the line voltage to the common of the output relay using fast tabs. In order to reduce time in selecting models, the Series TSW has universal high and low power supply models and field selectable engineering units. The Series TSW includes one TS-1 PTC thermistor probe.


This product can be used in the following applications: