With increasing magnitude of IG, the forward breakover voltage is reduced, and eventually at IG3, the device will turn on successfully if a minimum current, called a latching current, is maintained.

• 随着IG幅值的增加，正向导通电压减小。最终在IG3处，只要晶闸管持续流过一个最低电流（即闭锁电流），便可使其导通。