用來(lai)保(bao)護線路(lu)和風(feng)機(ji)的過載及(ji)短路(lu)。
本電(dian)(dian)控箱電(dian)(dian)源為三相五線制供電(dian)(dian),三相電(dian)(dian)源可上進,也可下進。接(jie)至電(dian)(dian)控箱底(di)部的(de)端子排(pai)中,裝設的(de)自(zi)動空氣開關QF作雙速風(feng)機(ji)短路保(bao)護,熱(re)繼電(dian)(dian)器FR用作低速過(guo)載保(bao)護。
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