GTH - Transformer fan speed controller

The GTH series of transformer fan speed controllers regulate the rotational speed of single-phase voltage controllable motors in steps by varying the output voltage according to the measured temperature. They are equipped with auto-transformer(s) and control the speed of fans in automatic or manual mode (in five steps) according to the input provided by the connected temperature sensor. The unregulated output is also controlled in function of the measured temperature and can be used to control a valve (e.g. hot water supply).