break-make-break contact 断触点

make before break contact 先接后断切换触点

make-before-break contact 先闭后开触点 ; 先接后离触点 ; [通信] 先合后断触点

make and break contact 闭开接点

break make contact 断合触点

break-make contact 开合接点

two way break before-make contact 双向先断后合触点

make-break-make contact 合断合触点

make-before-break changeover switch contact 先闭后断换向开关接点