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What do the terms AC1 and AC3 mean?

FA120833

14/11/2018

Issue:
What are the utilization categories AC-1 and AC-3?

Product Line:
Schneider Electric Products

Environment:
Inductive and Resistive Loads

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.