NC和NO都是輔助觸點(diǎn),NC是常閉點(diǎn),NO是常開(kāi)點(diǎn)。NO和NC的觸點(diǎn)編號(hào)是有規(guī)律的。11和12是一對(duì)常閉點(diǎn),13和14是一對(duì)常開(kāi)點(diǎn),21和22是一對(duì)常閉點(diǎn),23和24是一對(duì)常開(kāi)點(diǎn),以此類推,凡是有2的點(diǎn),都是常閉點(diǎn),有4的點(diǎn),都是常開(kāi)點(diǎn)。偶數(shù)編號(hào)是引出端,奇數(shù)編號(hào)是公共端