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A controller designed to regulate the rotational speed of fans equipped with electronically commutated motors (EC) or other devices controlled by a 0-10V DC signal. The required power source is 10-12VDC/1mA, which is available in most EC controllers. The output is a stepless 0-10VDC signal. The controller is equipped with an additional switching contact max. 3A/230V AC or 3A/12V DC.