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Help me Identify this Disc Capacitor

 
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F4iMerlin



Joined: 24 Feb 2007
Posts: 1

PostPosted: Sat Feb 24, 2007 6:51 pm    Post subject: Help me Identify this Disc Capacitor Reply with quote

I need to replace this capacitor, but I cant seem to find a resource to decode the values. I was hoping a bright individual here might be able to help so I can find a new one. Thanks!
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sun Feb 25, 2007 6:50 am    Post subject: Reply with quote

...Strictly going by memory. Seems like I have seen a similiar protector device on some piece of equipment & while it may look like a cap, it is some sort of a protector or varistor? What equipment is it out of? Is it out of some sort of a speaker/crossover ??
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gilloz



Joined: 03 Feb 2007
Posts: 33
Location: So. Cal High Desert

PostPosted: Tue Feb 27, 2007 4:38 am    Post subject: ID cap Reply with quote

Do what I did one time. I took an undefinable cap to Radio Shack and used one of their Capacitor Meters to get the value.
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FuzzyUK
Guest





PostPosted: Thu Mar 01, 2007 8:46 pm    Post subject: Not likely a capacitor Reply with quote

I agree; looks like a varistor of some sort rather than a capacitor and I've been in electronics over 40 years. Was it across the mains supply?
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RODALCO



Joined: 28 Oct 2006
Posts: 30
Location: Auckland - New Zealand

PostPosted: Sat Mar 03, 2007 9:22 am    Post subject: MOV Reply with quote

Looks like a Metal Oxide Varistor or MOV device to me too.

These are usually near the powersupply at the incoming mains supply to clamp voltage spikes, to protect equipment downstream in the equipment.

For 230 Volts RMS i usually get 280 V rms 6 or 20 kA rating from Jaycars for NZ$2, about US$ 1.40

For 110 Volts you probably need to get something around the 140 V rms rating.

Good luck, Raymond
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RODALCO



Joined: 28 Oct 2006
Posts: 30
Location: Auckland - New Zealand

PostPosted: Sat Mar 03, 2007 9:29 am    Post subject: MOV Reply with quote

Just had a look in my spare parts box in my workshop.
I have a red one, and the legs are exacltly tagged at the sides as the one on your photo.
The coding is vague but 400L40 and 6503 is printed on it.
That one is rated for 400 volts rms, came out of a 3 phase solid state kWh meter

These usually blow to destruction or crack open.

In principle your equipment should work without it only for a short testrun.
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