A switch that moves in synchronism with a pulse device, such as a rotary telephone dial. Each digit dialed causes the movement of successive selector switches to carry the connection forward until the desired line is reached.

• 一种与脉冲装置同步移动的开关,如旋转式电话拨号盘,每拨一个数字将引起相继的选线器开关移动,使之向前连接直到接上所需线路为止。同stepperswitch。