IEC Contactor Ratings

I'm looking for a definition of AC1, AC# and AC4. I've Googled without luck.

AC 1 is used for a resistive load and AC2 is used for an inductive load like a motor for an example a contactor may be rated 25A @ AC1 but only 9A @ AC3

IEC/EN 60947-4

AC-1 Power factor > 0.95
AC-2 Slip ring motors
AC-3 Squirrel cage motors
AC-4 Plugging or inching

I offered this once before:
AC-1
Non-inductive or slightly inductive loads (resistive loads) such as resistance furnaces.

AC-2
Slip-ring motors, starting, plugging (stopping or reversing the motor while running).

AC-3
Squirrel cage (AC Induction) motors, starting, switching off motor while running.

AC-4
Squirrel cage (AC Induction) motors, plugging, jogging, inching.


DC-1
Non-inductive or slightly inductive loads (resistive loads) such as resistance furnaces.

DC-2
Shunt motors, starting, switching off motors while running.

DC-3
Shunt motors, starting, plugging, jogging, inching.

DC-4
Series motors, starting, switching off motors while running.

DC-5
Series motors, starting, plugging, jogging, inching.

I failed to reply then about AC23 but here is a link that offers info: http://www.galco.com/circuit/Switches.htm

Ron,

That is great. Thank you.

Cannot argue with the above but for a summary:

Go to http://www.wiringmanual.com/norm038.html

Regards

Pouch

pouch said:

Cannot argue with the above but for a summary:

Go to http://www.wiringmanual.com/norm038.html

Regards

Pouch

Click to expand...

Nice link, i have a moeller wiring manual and they are very handy, didnt know they had a website for it!

Obviously very old, but here is a different explanation link:

https://en.wikipedia.org/wiki/Utilization_categories