AFCI design

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cosmos

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How does an AFCI work? I assume it senses current impulses; but how does it avoid false trips from appliance surges. Has anyone experienced these devices actually preventing a fire?
 
Re: AFCI design

It has microprocessor that looks for the arc signature as a wave form. It can best be explained with a drawing.
 
Re: AFCI design

afci_c5.gif
 
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