The APW 56428 Toaster Thermostat with 1/4" Bulb, 100-550°F regulates heat within compatible commercial toasters by sensing temperature and adjusting the heating circuit to maintain the selected setting. The sensing bulb responds to changes inside the toaster, while the thermostat controls electrical operation to support consistent heat during each cycle. Its 100-550°F adjustment range... https://partsfe.com/56428-apw-thermostat-ka-14-x-5-916-72