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What do the terms AC1 and AC3 mean?

Issue:
What do the terms AC1 and AC3 mean?

Product Line:
Products sold and used in the US

Environment:
Products sold and used in the United States

Resolution:
AC-1 - This category applies to all AC loads where the power factor is more than 0.95. These are primarily non-inductive or slightly inductive loads, such as resistive loads. Breaking the arc remains easy with minimal arcing and contact wear. 

AC-3 - This category applies to squirrel cage motors with breaking during normal running of the motor.
On closing, the contactor makes the inrush current, which is about 5 to 7 times the rated full load current of the motor.
On opening, the contactor breaks the rated full load current of the motor.
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