with auto restetting，addlock-stopto avoid mistaker operating.
C.功能为2带常开触的按钮，自动复位，适合于高压电机控制电路。或采用A功能面板。
Button with 2 usually-open contacts and auto-resetting .Suitable for high-voltage engine control circuitorfunction pancel A.
D.小功率电源开关。Mini-power switch.
E.功能与三钮相同，控制电机正反转用，正反起动位置自动复位 Function is the same as threa buttons to control-conversion of FWBW engibe, FWBW starter