The KSD309 series high temperature ceramic bimetallic thermostat has the max. operating temperature (280C) of high temperature limit switch. This high temperature thermostat suits for the high-temp. home appliances, such as oven, toaster, microwave oven etc. It's also used for dishwasher thermostat. KSD309 series is divided into 2 sub-series: KSD309-A sub-series (single-temp. type), KSD309-B sub-series (dual-temp. type).