1、繼電器額定工作電壓的選擇
繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器額(e)(e)定(ding)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)是繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器最(zui)主要的(de)(de)一項技術參數(shu)。在使(shi)用(yong)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器時，應(ying)該首先考慮所在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(即繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器線(xian)圈所在的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu))的(de)(de)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器的(de)(de)額(e)(e)定(ding)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)應(ying)等于(yu)所在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。一般所在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)是繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器額(e)(e)定(ding)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)0.86。注意所在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)工(gong)(gong)(gong)(gong)件電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)千萬(wan)不能超過繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器額(e)(e)定(ding)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，否則(ze)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器線(xian)圈容易燒(shao)毀。另外，有(you)些集(ji)成電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，例(li)如NE555電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)是可(ke)以(yi)直接驅動繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器工(gong)(gong)(gong)(gong)作的(de)(de)，而有(you)些集(ji)成電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，例(li)如COMS電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)輸出(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)小，需(xu)要加(jia)一級晶(jing)體(ti)管(guan)放大電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)方可(ke)驅動繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器，這就應(ying)考慮晶(jing)體(ti)管(guan)輸出(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)應(ying)大于(yu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器的(de)(de)額(e)(e)定(ding)工(gong)(gong)(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。
2、觸點負載的選擇
觸(chu)(chu)點負(fu)載是指(zhi)觸(chu)(chu)點的(de)承(cheng)受能(neng)力(li)。繼(ji)電器(qi)(qi)的(de)觸(chu)(chu)點在轉換時可承(cheng)受一(yi)定的(de)電壓和電流。所以在使(shi)用繼(ji)電器(qi)(qi)時，應考(kao)慮加在觸(chu)(chu)點上的(de)電壓和通過觸(chu)(chu)點的(de)電流不能(neng)超(chao)過該繼(ji)電器(qi)(qi)的(de)觸(chu)(chu)點負(fu)載能(neng)力(li)。例如，有一(yi)繼(ji)電器(qi)(qi)的(de)觸(chu)(chu)點負(fu)載為28V(DC)×10A，表(biao)明該繼(ji)電器(qi)(qi)觸(chu)(chu)點只能(neng)工作(zuo)在直流電壓為28V的(de)電路上，觸(chu)(chu)點電流為10A，超(chao)過28V或(huo)10A，會影響繼(ji)電器(qi)(qi)正(zheng)常(chang)使(shi)用，甚至燒毀觸(chu)(chu)點。
3、繼電器線圈電源的選擇
這(zhe)是指繼電(dian)器線(xian)圈使用(yong)的是直(zhi)流電(dian)(DC)還是交流電(dian)(AC)。通常，初學者在進行電(dian)子制作活動中，都(dou)是采(cai)(cai)用(yong)電(dian)子線(xian)路，而電(dian)子線(xian)路往往采(cai)(cai)用(yong)直(zhi)流電(dian)源供電(dian)，所(suo)以必(bi)須是采(cai)(cai)用(yong)線(xian)圈是直(zhi)流電(dian)壓的繼電(dian)器。
