：確定安全標(biao)志：依據(ju)產(chan)品將銷售的市場要求，選定電機(ji)保護(hu)斷路器的安全認證標(biao)志及安全標(biao)準（UL標(biao)準或IEC標(biao)準電機(ji)保護(hu)斷路器）。
確(que)(que)定(ding)(ding)(ding)(ding)(ding)外型(xing)(xing)(xing)(xing)尺寸(cun)：根(gen)(gen)據(ju)(ju)安(an)裝空間(jian)和(he)確(que)(que)定(ding)(ding)(ding)(ding)(ding)的(de)(de)(de)(de)安(an)全認證標志及安(an)全標準，選(xuan)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)外型(xing)(xing)(xing)(xing)尺寸(cun)。確(que)(que)定(ding)(ding)(ding)(ding)(ding)型(xing)(xing)(xing)(xing)號(hao)：根(gen)(gen)據(ju)(ju)被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)個性(xing)(xing)，選(xuan)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)型(xing)(xing)(xing)(xing)號(hao)。例如(ru)，被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)個性(xing)(xing)為(wei)(wei)恒定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)，則(ze)(ze)選(xuan)用(yong)疾速熔斷(duan)型(xing)(xing)(xing)(xing)。確(que)(que)定(ding)(ding)(ding)(ding)(ding)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)：根(gen)(gen)據(ju)(ju)被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)輸入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)及運用(yong)要求，確(que)(que)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。例如(ru)，被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)輸入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)為(wei)(wei)220V，則(ze)(ze)須選(xuan)用(yong)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)220V以(yi)上(shang)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)，可選(xuan)250V、300V、350V等；但思忖成(cheng)本要素(su)，無須選(xuan)用(yong)過高的(de)(de)(de)(de)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。確(que)(que)定(ding)(ding)(ding)(ding)(ding)最小(xiao)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)：根(gen)(gen)據(ju)(ju)被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)穩太(tai)工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)及相關的(de)(de)(de)(de)使(shi)用(yong)折損系(xi)數，初步(bu)確(que)(que)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)。例如(ru)，被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)穩太(tai)工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)為(wei)(wei)1A，選(xuan)用(yong)UL標準延(yan)時電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)，工(gong)作(zuo)環境溫度約(yue)80℃，則(ze)(ze)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)最小(xiao)選(xuan)：1A×1.25÷0.5=2.5A。確(que)(que)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)最小(xiao)I2T：根(gen)(gen)據(ju)(ju)被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)浪(lang)涌I2T，確(que)(que)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)I2T。例如(ru)，被(bei)(bei)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)回(hui)(hui)(hui)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)(de)(de)浪(lang)涌I2T為(wei)(wei)1（A2S），為(wei)(wei)保(bao)(bao)證電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)能承受10萬次以(yi)上(shang)的(de)(de)(de)(de)沖擊(ji)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)I2T應大于：1÷0.2=5（A2S）。確(que)(que)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)：根(gen)(gen)據(ju)(ju)最小(xiao)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)和(he)最小(xiao)I2T值(zhi)(zhi)，查產品目(mu)錄(lu)中對(dui)應型(xing)(xing)(xing)(xing)號(hao)規格，取既大于最小(xiao)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)值(zhi)(zhi)且其I2T值(zhi)(zhi)也大于最小(xiao)I2T值(zhi)(zhi)的(de)(de)(de)(de)初級額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)規格為(wei)(wei)選(xuan)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)保(bao)(bao)護(hu)(hu)(hu)(hu)(hu)(hu)斷(duan)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)器(qi)(qi)的(de)(de)(de)(de)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)。例如(ru)，依據(ju)(ju)以(yi)上(shang)最小(xiao)值(zhi)(zhi)，（1）如(ru)額(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)2.5A的(de)(de)(de)(de)I2T為(wei)(wei)4.3 A2S，3A的(de)(de)(de)(de)I2T為(wei)(wei)5.4A2S，則(ze)(ze)取3A為(wei)(wei)選(xuan)用(yong)