用來保護線路(lu)和風機的過(guo)載及(ji)短路(lu)。
本電(dian)(dian)控箱電(dian)(dian)源為三相(xiang)五線制(zhi)供電(dian)(dian),三相(xiang)電(dian)(dian)源可上進,也可下進。接至電(dian)(dian)控箱底(di)部的(de)端(duan)子排中(zhong),裝(zhuang)設的(de)自動(dong)空(kong)氣(qi)開關QF作雙(shuang)速(su)風機短路保(bao)護(hu),熱繼電(dian)(dian)器FR用作低速(su)過載保(bao)護(hu)。
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