用來保護線路和(he)風機的過載及短路。
本電(dian)(dian)控箱電(dian)(dian)源為三(san)相五線制供電(dian)(dian),三(san)相電(dian)(dian)源可上進,也可下進。接(jie)至電(dian)(dian)控箱底(di)部的端子排中,裝設的自(zi)動空氣(qi)開關(guan)QF作雙速風機短(duan)路(lu)保護,熱(re)繼電(dian)(dian)器FR用作低速過載保護。
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