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About product and suppliers:
        2,137 speed control unit products are offered for sale by suppliers on Alibaba.com, of which generator parts & accessories accounts for 10%, motor controller accounts for 1%, and other electrical equipment accounts for 1%. 

A wide variety of speed control unit options are available to you, 

There are 2,137 suppliers who sells speed control unit on Alibaba.com, mainly located in Asia. The top countries of suppliers are India, China, and Taiwan, China, from which the percentage of speed control unit supply is 1%, 98%, and 1% respectively.