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          • HAVD-A-2H2D晃電繼電器用于保證重要電動機在電源故障情況下能順利自啟動。當電機有失電時,在0-10S(可調)時間內,輸出接點保持閉合狀態,著故障為晃電,則恢復供電后通過由本接點構成的自保持回路,電機...
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