用來保護線路(lu)和風機的過載及短路(lu)。
本電(dian)(dian)(dian)控箱(xiang)電(dian)(dian)(dian)源為三相(xiang)五(wu)線制供電(dian)(dian)(dian),三相(xiang)電(dian)(dian)(dian)源可(ke)上(shang)進(jin),也(ye)可(ke)下進(jin)。接至電(dian)(dian)(dian)控箱(xiang)底部的端子排中(zhong),裝設的自動(dong)空氣開(kai)關QF作雙速(su)風(feng)機短(duan)路保護(hu),熱(re)繼電(dian)(dian)(dian)器FR用作低速(su)過載保護(hu)。
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