•  Controls the supply voltage to the blower motor according to the gate voltage sent from the climate control unit and adjusts the rotation speed (airflow volume).

•  There are four electrodes: source, gate, drain and feedback electrodes.

•  The resistance between terminals C and D (between drain and source) changes according to the voltage (gate voltage) applied to terminal A (gate).

•  When the gate voltage increases, the resistance between terminals C and D decreases, allowing the current to flow easily.