Working principle
When the spool is in a neutral state, the fixed points of contact and the moving points of contact touch and are in a state of electrical conductance. When the spool begins to operate, the moving points of contact move to the left side in tandem with it, and the fixed points of contact and moving points of contact enter a state of electrical non-conductance.
PAT.PEND. | |
Spool neutral state (SOL OFF) |
Spool operating state (SOL ON) |