Non-Switching Rating:

The power carrying capacity of a switch after contact closure and end of contact bounce. Typically, far higher than the contact rating (switching rating) of a switch.

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.

Inrush:

The initial transitory high-level of current at contact closing (making). A characteristic of capacitive and some resistive loads. The inrush currents can be large and long enough to cause severe degradation of the contacts. See Resistive Load. Capacitive Load. Power...

EMC:

Electro-Magnetic Compatibility.