由一根绝缘杆同时开动的三个移动触点断开和连接电路。
Three movable contacts, actuated simultaneously by an insulated rod, open and close the circuit.
在接触点没有这种移动的工具，在此模具的末端都有一个制动器来防止此针头更进一步的被推动。
Tools that do not have this movement at the contacts ALL have a stop at the end of the die to stop the plug being pushed in any further.
我们还观察到，老鼠会倾向于移动或者定向它的鼻子朝向准确的接触点。
We also observed that the rat will tend to move, or orient, it's nose toward the exact point of contact.
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