The APW 56540 Toaster Thermostat with 1/4\" Bulb, 100-550°F monitors internal heat and regulates the heating circuit in compatible commercial toasters. As the sensing bulb detects temperature changes, the thermostat responds by adjusting electrical operation to maintain the selected setting throughout the toasting cycle. Its broad 100-550°F range accommodates different food preparation requirements, while the 1/4-inch bulb fits the designated sensing location. This replacement control supports consistent heat adjustment and uniform toasting across routine commercial foodservice applications.