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整定電流是電動(dòng)機(jī)額定電流的0.7~1.0倍,也就是說整定電流只能小于或等于額定電流。而動(dòng)作電流不一定就是整定電流,就熱繼電器的保護(hù)特性來說,動(dòng)作電流和額定電流的比值越大,相應(yīng)的熱繼電器動(dòng)作時(shí)間就越短。
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