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IMDSM04
IMDSM04
IMDSM04
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熔断器的额定电压要大于或等于电路的额定电压
熔断器的额定电流要依据负载情况而选择。
①电阻性负载或照明电路,这类负载起动过程很短,运行电流较平稳,一般按负载额定电流的1~1.1倍选用熔体的额定电流,进而选定熔断器的额定电流。
②电动机等感性负载,这类负载的起动电流为额定电流的4~7倍,一般选择熔体的额定电流为电动机额定电流的1.5~2.5倍。这样一般来说,熔断器难以起到过载保护作用,而只能用作短路保护,过载保护应用热继电器才行。
对于多台电动机,要求
多台IFU≥(1.5~2.5)INMAX+∑IN
式中IFU——熔体额定电流(A), INMAX——一台电动机的额定电流(A)
③为防止发生越级熔断,上、下级(供电干、支线)熔断器间应有良好的协调配合,为此,应使上一级(供电干线)熔断器的熔体额定电流比下一级(供电支线)大1~2个级差。
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