Temperature Controller : What is a Temperature Controller? As the name implies a temperature controller is an instrument used to control temperature. The temperature controller takes an input from a temperature sensor and has an output that is connected to a control element such as a heater or fan. distribution box manufacturer from China and the world, distribution box manufacturer, ELCB distribution box manufacturer, LCB distribution box manufacturer, CB distribution box manufacturer.FI compact earth leakage circuit. breaker detect and interrupt earth. ELCB supplier from China and the world, ELCB, ELCB manufacturers, ELCB factories, ELCB wholesale.