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Subject: Protecting DC circuits from MAINS

Date: 09/05/02 at 3:16 PM
Posted by: Darren
E-mail: dazlogan@aol.com
Message Posted:

Hi all,

I want to add MAINS protection to a sensitive DC circuit.
I.e., if MAINS is applied to my 12V DC circuit accidentally, i want to be able to clamp it before it damages my circuit.

Anyone with experience of doing this ? if so, how ?

I am thinking of using a quick blow fuse, then a metal oxide varistor with a clamp voltage of say 20VAC. Do you think the varistor will be fast enough ?
Response time typically <25nS


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