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IMFEC11
IMFEC11
IMFEC11
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铁壳开关也称封闭式负荷开关图是它的外形与结构图。它有安装在铸铁或钢板制成的外壳内的刀式触头和灭弧系统、熔断器以及操作机构等组成。与闸刀开关相比它有以下特点:
(1)触头设有灭弧室(罩)、电弧不会喷出,可不必顾虑会发生相间短路事故;
(2)熔断丝的分断能力高,一般为5KA,高者可达50KA以上;
(3)操作机构为储能合闸式的,且有机械联锁装置。前者可使开关的合闸和分闸速度与操作速度无关,从而改善开关的动作性能和灭弧性能;后者则保证了在合闸状态下打不开箱盖及箱盖未关妥前合不上闸,提高了性;
(4)有坚固的封闭外壳,可保护操作人员免受电弧灼伤。
铁壳开关有HH3、HH3、HH10、HH11等系列,其额定电流由10A到400A可供选择,其中60A及以下的可用于异步电动机的全压起动控制开关。
用铁壳开关控制电加热和照明电路时,可按电路的额定电流选择。用于控制异步电动机时,由于开关的通断能力为4Ie,而电动机全压起动电流却在(4~7)额定电流以上,故开关的额定电流应为电动机额定电流的1.5倍以上。
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