起重機保護櫃的用途
，是為起重機上所用的交流三相感應式電動機提供過電流、欠電壓保護，並對整個起重機提供終端保護。
      zaiqizhongjibaohuguizhong，dangqizhongjideqidiaozhongliangchaoguoedingzhishi，huozhedianwangdianyadiyuedingzhijiaoduoshi，diandongjidoujiangzaiguozaizhuangtaixiayunxing
，weifangzhidiandongjishaohui，bixushixingguozaibaohu。dankaolvdaodiandongjiyouyidingdeguozainengli，suoyiguozaibaohushicaiyongguodianliuyanshijidianqi(如JLl2
、JLl4係列過電流繼電器)。zhiyuqiandianyabaohumeiyouzhuanmenshezhijidianqi

，ershiyoujiechuqiheguodianliujidianqijianjietigongbaohu。zhongduanbaohuyongxingchengkaiguanhuojiejinkaiguan，tanengbaozhengqizhongjidaxiaochedeyundonghediaogoudeshangshenggaodudouzaiguidingdefanweinei
，congerbimianfashengdaxiaochezhuangqianghezhongwujuandaojuantongshangjianggangsishengjuanduanbingshizhongwuyougaochudieluodeexingshigu。