用來保護線路(lu)和風機的過載及(ji)短路(lu)。
本電(dian)(dian)控箱(xiang)(xiang)電(dian)(dian)源(yuan)(yuan)為三相(xiang)五(wu)線制供電(dian)(dian),三相(xiang)電(dian)(dian)源(yuan)(yuan)可(ke)上進(jin),也可(ke)下進(jin)。接(jie)至電(dian)(dian)控箱(xiang)(xiang)底部的端子排中,裝(zhuang)設(she)的自動(dong)空氣開關QF作雙速(su)風機短路(lu)保護,熱繼電(dian)(dian)器FR用作低速(su)過(guo)載保護。
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