[Premium-Rx] Cubic R3030 Help

[Chuck Urmson]

Hi Lee,

I have also had one blow up on me.  They are called Varistors and they 
are designed to clamp voltage transients so they have a somewhat 
different role to a fuse.  Sacrificing themselves to protect the 
equipment is also proper behaviour.

These are freely available from electronics distributors and the 
chunkiest one you can that will fit the space is what I would go for. 
The schematic says 430V but I replaced both of mine (to be on the safe 
side) with 275Vrms ones and have not had a problem since.

I have also made a habit of sticking one of these across the mains input 
of all equipment I buy.  This should be installed after the fuse.

The parts I used were Epcos SIOV-S10K275 for the PSU and Epcos 
SIOV-S20K275 (chunkier) for where there is enough apace.

73s,
Chuck



L D Ritta wrote:
> Hello Everyone
>  
> Well I managed to blow the side off a component in my power supply. I 
> have have never used one these before.
> There are two of them, one across the ac input the  other across dc side 
> of the bridge rectifer. This CR12
> right under switch S1 What is it? I need to replace it and I don't know 
> what to order. Is this what they use in place of a fuse?
> Why didn't they have a fuse?
>  
> 73 Lee
> 
> 
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