Electrical Life:

Life of a switch (number of operations) under a specified combination of electrical load, actuation, environment, and criterion of failure.

Free Position:

The position of the button or toggle of a switch in its normal position. The free position is usually measured from the center of the mounting holes to the top of the button on a basic switch or from the top of the button to a reference point on a pushbutton...

Inductive Load:

A load in which the initial current on making (closing) of the contacts is lower than steady state and rises slowly. On breaking (opening) of the contacts, the current is greater than steady state. The stored energy of the inductor provokes a long and severe arcing...

Electrical Load:

The amount of electricity that is applied to the switch or the circuit.

Gap:

The shortest straight-line distance between two separate contacts.