用來(lai)保護線路和風機(ji)的(de)過載及短路。
本電(dian)(dian)控(kong)箱電(dian)(dian)源為三(san)相五線制供電(dian)(dian),三(san)相電(dian)(dian)源可上進,也可下(xia)進。接至電(dian)(dian)控(kong)箱底(di)部(bu)的端子排中(zhong),裝設(she)的自(zi)動(dong)空(kong)氣開關QF作雙速(su)風機短路保護(hu),熱繼電(dian)(dian)器FR用作低速(su)過載保護(hu)。
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