低(di)壓(ya)斷路(lu)器(qi)(qi)的(de)主觸(chu)點(dian)是靠(kao)手動(dong)(dong)操作(zuo)(zuo)或(huo)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)合閘的(de)。主觸(chu)點(dian)閉合后，自(zi)由脫(tuo)扣(kou)(kou)(kou)(kou)機構(gou)將主觸(chu)點(dian)鎖在合閘位置上。過電(dian)(dian)(dian)(dian)(dian)(dian)流脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)的(de)線(xian)(xian)圈(quan)和(he)熱脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)的(de)熱元(yuan)件(jian)與主電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)串聯(lian)，欠(qian)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)的(de)線(xian)(xian)圈(quan)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)源并聯(lian)。當(dang)(dang)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)發生短路(lu)或(huo)嚴重過載時(shi)，過電(dian)(dian)(dian)(dian)(dian)(dian)流脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)的(de)銜鐵(tie)吸合，使自(zi)由脫(tuo)扣(kou)(kou)(kou)(kou)機構(gou)動(dong)(dong)作(zuo)(zuo)，主觸(chu)點(dian)斷開主電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)。當(dang)(dang)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)過載時(shi)，熱脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)的(de)熱元(yuan)件(jian)發熱使雙(shuang)金屬片上彎曲，推動(dong)(dong)自(zi)由脫(tuo)扣(kou)(kou)(kou)(kou)機構(gou)動(dong)(dong)作(zuo)(zuo)。當(dang)(dang)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)欠(qian)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)時(shi)，欠(qian)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)的(de)銜鐵(tie)釋放。也使自(zi)由脫(tuo)扣(kou)(kou)(kou)(kou)機構(gou)動(dong)(dong)作(zuo)(zuo)。分(fen)勵(li)脫(tuo)扣(kou)(kou)(kou)(kou)器(qi)(qi)則作(zuo)(zuo)為(wei)遠距(ju)(ju)離(li)控(kong)(kong)制用(yong)，在正常(chang)工作(zuo)(zuo)時(shi)，其線(xian)(xian)圈(quan)是斷電(dian)(dian)(dian)(dian)(dian)(dian)的(de)，在需要距(ju)(ju)離(li)控(kong)(kong)制時(shi)，按下(xia)起動(dong)(dong)按鈕，使線(xian)(xian)圈(quan)通電(dian)(dian)(dian)(dian)(dian)(dian)。

DZ47-60小(xiao)型斷路(lu)器(qi)，主要用(yong)于交流50Hz/60Hz，額(e)定電壓至400V，額(e)定電流至60A的線路(lu)中(zhong)起(qi)過載、短路(lu)保護作(zuo)用(yong)，同時也可以在正常情況下不(bu)頻繁地通(tong)斷電器(qi)裝置和照明線路(lu)，NXBLE，但(dan)不(bu)適(shi)用(yong)于直接保護電動(dong)機(ji)及電熱設備、電容(rong)柜等高(gao)感(gan)性(xing)和高(gao)容(rong)性(xing)負載。

應用(yong)范圍：主要用(yong)于交流(liu)50Hz/60Hz，額定電壓至400V，額定電流(liu)至60A的線(xian)路(lu)中起過載、短路(lu)保護(hu)作用(yong)。

1、斷(duan)(duan)路(lu)器的(de)額定極限短路(lu)分(fen)斷(duan)(duan)能(neng)力(li)：按規(gui)定的(de)實驗(yan)程序所規(gui)定的(de)條件(jian)，不包括斷(duan)(duan)路(lu)器繼續(xu)承(cheng)載其(qi)額定電流能(neng)力(li)的(de)分(fen)斷(duan)(duan)能(neng)力(li)；

2、斷路器的額定(ding)運行短路分(fen)(fen)斷能力(li)(li)：按規定(ding)的實驗程(cheng)序所規定(ding)的條件，包括(kuo)斷路器繼續承載(zai)其額定(ding)電流能力(li)(li)的分(fen)(fen)斷能力(li)(li)；

3、額(e)定極限短(duan)路分斷能力的試驗程序為O—t—CO。

其具體試驗(yan)是：把線(xian)路的(de)電流調整到預期的(de)短路電流值（例如(ru)380V

，50kA），而試驗(yan)按鈕未(wei)合(he)，被試斷(duan)(duan)(duan)路器(qi)處于(yu)合(he)閘(zha)(zha)位置，按下(xia)試驗(yan)按鈕，斷(duan)(duan)(duan)路器(qi)通過50kA短路電(dian)流，斷(duan)(duan)(duan)路器(qi)立即(ji)開斷(duan)(duan)(duan)（open簡稱O），斷(duan)(duan)(duan)路器(qi)應完好，且能(neng)(neng)再(zai)合(he)閘(zha)(zha)。t為(wei)間歇(xie)時(shi)間，一般為(wei)3min，此(ci)時(shi)線(xian)路仍處于(yu)熱(re)備狀(zhuang)態，斷(duan)(duan)(duan)路器(qi)再(zai)進(jin)行一次接(jie)通（close簡稱C）和(he)緊接(jie)著的(de)開斷(duan)(duan)(duan)（O），（接(jie)通試驗(yan)是考核斷(duan)(duan)(duan)路器(qi)在(zai)峰值電(dian)流下(xia)的(de)電(dian)動和(he)熱(re)穩定性(xing)）。此(ci)程序(xu)即(ji)為(wei)CO。斷(duan)(duan)(duan)路器(qi)能(neng)(neng)完全(quan)分斷(duan)(duan)(duan)，則其極限(xian)短路分斷(duan)(duan)(duan)能(neng)(neng)力合(he)格。