A bimetal thermostat is a simple yet effective mechanical device widely used for temperature regulation in various applications. Based on the principle of two metals with different coefficients of expansion, this device provides reliable and cost-efficient temperature control. It is commonly found in household appliances, automotive systems, and industrial equipment. In this article, we will explore how bimetal thermostats work, their applications, advantages, and limitations.

    Working Principle of a Bimetal Thermostat

    The core mechanism behind a bimetal thermostat is the differential expansion of two metals. Typically, the device consists of two strips of metal, which are bonded together. These metals are chosen for their distinct expansion rates when subjected to temperature changes. One metal expands more than the other as the temperature increases, causing the bimetallic strip to bend. This bending action can trigger a mechanical switch, which either opens or closes an electrical circuit, thus controlling the flow of electricity to a connected device.