Relay Recommendation

I'm trying to put together a protective device for the hotshoe on my digital
camera. All that triggering an external flash requires is connecting its two
terminals together through the camera, but most digicams will fry if exposed
to more than 6v fed down the line by the flash unit.

I'm thinking that one or two AA batteries and a relay connected to the
camera would be just fine to protect against overvoltage, but the relay
needs to operate as close to instantly as possible and be able to pass
voltages from, say, 3 to 1000v on the flash unit side with no ill effect.

I had a look in the digikey catalogue, and just ended up getting confused by
the vast array of relays and mystery variables listed with them. Since I'll
be staking the life of the irreplaceably expensive camera on this, I was
wondering if someone could do me a huge favour and recommend the appropriate
part.

Thanks for any help!

CB


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