What do the terms AC1 and AC3 mean?


21 June 2021

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

Product Line:
Schneider Electric Products

Inductive and Resistive Loads

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.