The 431 series open on rise snap discs are used whenever a moisture or dustproof enclosure is required for safe, sensitive and reliable operation of your thermostat. A polypropylene boot enclosure filled with epoxy resin covers the thermostat. The bi-metal disc control element is in close proximity to the sensor cap to provide rapid response to temperature changes.

Since the bi-metal disc used in the 431 series open on rise thermostat is thermally and electrically insulated the bi-metal disc reacts only to the temperature of the controlled device or medium surrounding the disc. Instantaneous, positive action of the disc prolongs thermostat life by minimizing arcing and eliminates chattering, false cycling and electrical interference with radio and television reception. Long life is assured with wiping contacts.

The temperature range determines when the thermal switch will close, or engage the electrical circuit, and when it will automatically reset, or open. A specific temperature range may be designed according to your application needs, or choose from our standard ranges.