The most suitable for controlling the speed of a condenser fan of freezing and refrigeration condensing unit, package air conditioner and other units which are operated throughout a year.

• Keep condensing pressure constant in winter and intermediate seasons for stable operation.

• One of the following operation models is selectable when low speed. Minimum Speed Operation Cut off Operation

• Excellent noise-resisting design.

• Protective device conforms to IP54.

• Applicable to the external forced operation switch