[TechAssist] Re: Question - internal 120V AC line varistors- surge suppressors
- From: "Phillip R. Hull" <phil245@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 10 Dec 2003 14:13:27 -0500
I was told there are different values of MOV depending on the current of the
unit. For example a line MOV for a microwave oven that draws 15 amps,
probably would not protect a TV set, because it would surge thru the unit
before the MOV would short and blow the fuse.
Phillip R Hull STET
phil245@xxxxxxxxxxxxx
FAX 517--569-3075
Professional Technicians only
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, December 09, 2003 7:24 PM
Subject: [TechAssist] Question - internal 120V AC line varistors- surge
suppressors
> In general, what is a good quality and rating of a varistor to use at
> the 120V ac input of equipment where the varistor (surge suppressor) has
> been blown up by a power surge?
>
>
> Example, I have a Brother Intellifax 1270 fax machine that came in , hit
> by a power surge. I found the varistor at the 120V AC power input (Z1 on
> the power supply board) blowed up real good, along with the fuse which
> was black as coal. These were the only faults as the fax machine works
> now, however I don't know what varistor to use in place of the original.
> Whatever the part was, it did a great job at protecting the power
> supply. I will let the machine run awhile after repair in case the
> mosfet switcher transistor was stressed in the action.
>
> What would be the recommended voltage and amperage surge rating to
> replace the original with, perhaps purchased from Digikey or other
> similar generic parts supplier?
> --
>
> BTW, I titled the message the way I did because I thought I'd get more
> responses than if I titled it, "brother fax machine....etc, etc.......)
>
>
> Thanks for any help.
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
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