描述
結(jié)構(gòu)圖中觸點2有三對,串聯(lián)在被保護的三相主電路中。手動扳動按鈕為“合”位置(圖中未畫出),這時觸點2由鎖鍵3保持在閉合狀態(tài),鎖鍵3由搭鉤4支持著。要使開關分斷時,扳動按鈕為“分”位置(圖中未畫出),搭鉤4被杠桿7頂開(搭鉤可繞軸5轉(zhuǎn)動),觸點2就被彈簧1拉開,電路分斷。
自動開關的自動分斷,是由電磁脫扣器6、欠壓脫扣器11和熱脫扣器12使搭鉤4被杠桿7頂開而完成的。電磁脫扣器6的線圈和主電路串聯(lián),當線路工作正常時,所產(chǎn)生的電磁吸力不能將銜鐵8吸合,只有當電路發(fā)生短路或產(chǎn)生很大的過電流時,電磁吸力才能將銜鐵8吸合,撞擊杠桿7,頂開搭鉤4,使觸點2斷開,從而將電路分斷。
欠壓脫扣器11的線圈并聯(lián)在主電路上,當線路電壓正常時,欠壓脫扣器產(chǎn)生的電磁吸力能夠克服彈簧9的拉力而將銜鐵10吸合,如果線路電壓降到某一值以下,電磁吸力小于彈簧9的拉力,銜鐵10被彈簧9拉開,銜鐵撞擊杠桿7使搭鉤頂開,則觸點2分斷電路。當線路發(fā)生過載時,過載電流通過熱脫扣器的發(fā)熱元件13而使雙金屬片12受熱彎曲,于是撞桿7頂開搭鉤,使觸點斷開,從而起到過載保護作用。根據(jù)不同的用途,自動開關可配備不同的脫扣器。
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
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結(jié)構(gòu)的zui現(xiàn)代化的容錯控制器。
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