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The 3100 Series is a single-pole, single-throw switch activated by a snap-action bimetal disc. The case is laser welded to form a hermetically-sealed steel housing, with a glass-to-metal seal at the terminal junction. Temperature calibrations are pre-set at the factory. Each unit is thermally and mechanically inspected and tamperproof. They are available to open or close on temperature rise. A variety of mounting brackets and terminals is available. Used in high temperature control.

  • 3100 120 Vac max.: Not UL/CSA approved.
  • 3100U 240 V: UL/CSA approved.
  • 3100UX: UL/CSA approved.
3100 Series Precision Thermostats – Honeywell


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Browse 3100 Series Products

Product Functional Properties Open Temperature Close Temperature
3100 00030605 Open on rise 96.1 °C [205 °F] 6.7 °C [12 °F] max. diff.
3100 00150030 Close on rise 2.8 °C [37 °F] 12.8 °C [55 °F]
3100 00500037 Open on rise 105.0 °C [221 °F] 95.0 °C [203 °F]
3100 02600001 Open on rise 260.0 °C [500 °F] 200.0 °C [392 °F]
3100 03430001 Open on rise 80.0 °C [176 °F] 70.0 °C [158 °F]
3100 03810002 Open on rise 81.7 °C [179 °F] 5.6 °C [10 °F] max. diff.


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