How the Bi-Metal Thermostat Works

The thermostat is a device that can break and connect electrical current when it detects temperature changes in the surrounding environment according to the specified temperature setting. In general, the thermostat used today can be differentiated into two main types of Mechanical Thermostat and Electronic Thermostat. Mechanical Thermostat is basically a type of Contact Temperature Sensor that uses the Electro-Mechanical principle while Electronic Thermostat uses electronic components. The first thermostat discovered by a Dutch innovator named Cornelis Drebbel in England in the 17th century was the Mercury Thermostat used to regulate the temperature of a chicken incubator. The first modern thermostat to use Bi-Metallic was invented by a Scottish chemist named Andrew Ure in 1830 to control the temperature in textile production machinery. But now along with the development of technology, thermostat developed with more sophisticated and advanced technology created in the form of the thermostat can be found at

A mechanical thermostat is made up of two different types of metals and is affixed together so that it becomes a form called the Bi-Metallic strip (or Bi-Metal Strip). Two Strips will serve as a bridge to deliver or break the electrical current to the circuit heating or cooling system. At Normal, the Strip that serves as the bridge will always be in connected condition and flowing electric current, the connected circuit will be in ON condition as well. When the Strip becomes hot, one of the metals will expand and change the shape into a slight curve and will further curve as the hotter strips will eventually separate the strip relations with the circuit so that the flow of electricity to the heating or cooling system circuit also becomes disconnected or become OFF condition.