欧美亚久久综合一区二区色_亚洲一级免费电影_在线观看黄线网站_波波视频国产色情图片网手机版_日韩av中文无码人妻无码_乖打开双腿里面也要涂春荮_男人插女人欧美极品_国产欧美亚洲日韩视频精品_影音先锋+在线+母亲_伦理片秋霞网伦理片

When the circuit of an inductive load is suddenly disconnected, its overvoltage can exceed several times of the power supply voltage. Overvoltage will cause arcing and spark discharge between contacts, thereby damaging contacts such as contactors, relays, and electromagnetic clutches, and shortening the service life of equipment. The varistor has a shunt effect at high voltage, so it can be used to prevent spark discharge at the moment of contact opening, thereby protecting the contacts.