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在變頻器的交流電源輸入端一般用空氣開關作為變頻器的上電和停電，不能接<a title="施耐德交流接觸器" href="http://www.alatraveler.cn/pinpaishow.asp?categoryid=310&id=830" target="_blank">接觸器。控制和啟停變頻器一般有操作面板控制和外部端子控制兩種方式。用操作面板控制方式，就不需要接觸器；如果用外部端子控制方式，需要接觸器。
