A two-position key switch gives an operator two selectable states, but \u201ctwo-position\u201d does not tell you whether the key stays in the selected state or returns when released. Nor does it tell you which position allows key removal. Those choices affect the machine sequence, access policy, wiring, and how a technician interprets the panel. This guide separates those decisions so a buyer can specify a keyed selector without assuming that every device marked ON\/OFF works the same way.<\/p>\n
For a control-panel purchase, start with the operating sequence. Write down who turns the key, what happens while it is held, what remains active after it is released, and where the key may be removed. Only then choose the contact arrangement and mechanical details. A keyed switch is an access-controlled command device; it is not, on its own, a safety interlock, an emergency stop, or proof that the equipment is electrically isolated.<\/p>\n