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Old 05-19-2020, 02:15 PM   #1
mgray70
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Default SW182 Magnetic Blowout Info

I understand the purpose of the magnetic blowout, but don't understand how it works, or the do's and don't on the installation. I would just like to understand it better, if someone could shed some light on that subject, I'd appreciate it.

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Old 05-19-2020, 02:44 PM   #2
cgtech
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Default Re: SW182 Magnetic Blowout Info

Stolen from Wikipedia- "Magnetic blowouts use blowout coils to lengthen and move the electric arc. These are especially useful in DC power circuits. AC arcs have periods of low current, during which the arc can be extinguished with relative ease, but DC arcs have continuous high current, so blowing them out requires the arc to be stretched further than an AC arc of the same current. The magnetic blowouts in the pictured Albright contactor (which is designed for DC currents) more than double the current the contactor can break, increasing it from 600 A to 1,500 A."
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Old 05-19-2020, 02:51 PM   #3
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Default Re: SW182 Magnetic Blowout Info

The important thing to remember is that "Magnetic Blowouts" make the Solenoid contacts "polarity" sensitive.

You need to make sure the cable with the "highest voltage potential" (closest to the power source) goes on the terminal with the "+" sign otherwise the magnetic blowout will pull the spark into the center of the contact causing more damage than if You did not have them installed.
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Old 05-19-2020, 08:11 PM   #4
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Default Re: SW182 Magnetic Blowout Info

Good point! I forgot to mention that. (Polarity sensitivity part).
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Old 05-19-2020, 11:07 PM   #5
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Default Re: SW182 Magnetic Blowout Info

Definition of magnetic blowout: extinction of an electric arc when deflected by a magnetic field.

I believe that Albright uses a small permanent magnet to achieve this in their contactors equipped with magnetic blowouts.

Attached is some Albright technical information for the SW182.

Page 3 discusses the option of Magnetic Blowouts ... including the requirement that the "positive markings on the top cover of the contactor must be observed", as Sergio has pointed out.

Here is an interesting discussion on magnetic blowouts that might help to explain further how they work: https://www.eng-tips.com/viewthread.cfm?qid=187820
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Attached Files
File Type: pdf Albright SW180 and SW 190 Series DC Contactors.pdf (2.33 MB, 0 views)
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Old 05-20-2020, 08:31 AM   #6
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Default Re: SW182 Magnetic Blowout Info

Quote:
Originally Posted by Sergio View Post
The important thing to remember is that "Magnetic Blowouts" make the Solenoid contacts "polarity" sensitive.



You need to make sure the cable with the "highest voltage potential" (closest to the power source) goes on the terminal with the "+" sign otherwise the magnetic blowout will pull the spark into the center of the contact causing more damage than if You did not have them installed.
Thanks, that's kinda what I was looking for. I knew they are polarity sensitive, but since there is no definite positive and negative was a little confusing to me.

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