用來保護線路和風(feng)機的過載及短路。
本電(dian)控箱電(dian)源為(wei)三相(xiang)五(wu)線制供電(dian),三相(xiang)電(dian)源可上進,也(ye)可下進。接至電(dian)控箱底部(bu)的端子(zi)排中(zhong),裝(zhuang)設的自動空氣開關QF作雙速風機短路保(bao)護,熱繼電(dian)器FR用作低(di)速過載(zai)保(bao)護。
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