Honeywell Phenolic Manual Reset Thermostats, 3455RM Series, 3455RM-92990953, Switch Type SPST, Manual Reset, Open on Rise, Contact Type Silver Alloy, Phenolic, 15 A/10 A resistive max., B226, T146, Operating Temperature 52 °C to 232 °C [125 °F to 450 °F], Open Temperature 76 °C [ 168.8 °F], Close Temperature "Manual Reset", Open Tolerance 4 °C [7.2 °F], Close Tolerance N/A