Thermocoule Terminal Block is a bi-metallic junction, meaning it creates a voltage in relation to the temperature differential. The metal or alloy used to make block is the same as that used to make thermocouples used to measure temperature. This is used in pairs. A terminal block is a device that connects two or more wires in a secure manner. Thermocoule Terminal Block employs a clamping element and a conducting strip to hold and arrange connected wires. This is very effective and economical to use.