Honeywell Ceramic Automatic Reset Thermostat With Gold Contacts, 2450RCHG Series, 2450RCHG8138051, Switch Type SPST, Automatic Reset, Open on Rise, Contact Type Gold Alloy, Ceramic, Stand Off, 0.5 A, B210, T146, Operating Temperature 0 °C to 260 °C [32 °F to 500 °F], Open Temperature 135 °C [275 °F], Close Temperature 121.11 °C [250 °F], Open Tolerance 2.78 °C [5 °F], Close Tolerance 5.56 °C [10 °F]