限位開關(guān)又稱行程開關(guān)，可以安裝在相對靜止的物體（如固定架、門框等，簡稱靜物）上或者運(yùn)動的物體（如行車、門等，簡稱動物）上。當(dāng)動物接近靜物時，開關(guān)的連桿驅(qū)動開關(guān)的接點引起閉合的接點分?jǐn)嗷蛘邤嚅_的接點閉合。由開關(guān)接點開、合狀態(tài)的改變?nèi)タ刂齐娐泛蜋C(jī)。
   施耐德電氣是法國的工業(yè)先鋒之一。500強(qiáng)企業(yè)，電工企業(yè)。施耐德19世紀(jì)，施耐德電氣從事鋼鐵工業(yè)、重型機(jī)械工業(yè)、輪船建造業(yè)；20世紀(jì)，從事電力與自動化管理業(yè)。在成立的170多年里，施耐德電氣遇到過無數(shù)次挑戰(zhàn)，也做過數(shù)次重大戰(zhàn)略選擇，現(xiàn)在集團(tuán)已經(jīng)成長為行業(yè)者。 
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