This restriction is due to the coil of the contactor used.
此限制是由于所使用的接触器的线圈。
2
The coil and the control loop of the original AC contactor need not any change, the goal of electricity saving and silent running can be reached.
且不需对原交流接触器线圈和控制回路作任何改变，即可达到节电和无声运行的目的。
3
The utility model relates to an autorotation silent electricity-saving coil, used on the ac contactor in the low-voltage controlling circuit, realizing the silent electricity-saving running.