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Anonymous Poster #1

Electrical Switchgear

06/23/2017 5:43 AM

I want to know about difference between AC1 and AC3 rating in contractors? Why we use AC3 rating of contractor in inductive load motor?

Thank you.
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Anonymous Poster #2
#1

Re: Electrical Switchgear

06/23/2017 5:50 AM

About 49,600 results (0.42 seconds), using Google...
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PWSlack
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#2

Re: Electrical Switchgear

06/23/2017 6:43 AM

<...AC3 rating of contractor in inductive load motor?...> It stops the starting current blowing the contacts to smithereens, and thereby ensures a comfortable relationship with the facility's fire insurance company.

Define <...we...>, please?

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SolarEagle
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#3

Re: Electrical Switchgear

06/23/2017 7:18 AM

..."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 heating. 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."...

http://www.schneider-electric.us/en/faqs/FA120833/

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#4
In reply to #3

Re: Electrical Switchgear

06/23/2017 1:35 PM

Inductors make life so interesting.......especially when it comes to shutting fully loaded ones down. That is when things become the most interesting!

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