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Old 16th August 2012, 04:32 PM   #21
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If you are in series with the signal, I strongly suggest multiple contacts.

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Old 16th August 2012, 04:34 PM   #22
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Quote:
Originally Posted by AndrewT View Post
Bear,
how do you get the multi-parallel contacts to open at the same time?

You do not.

Why do you need to do this?

The important aspect is IF the closed state is important to signal transfer then a single contact is a major liability, imo.

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Old 17th August 2012, 08:44 AM   #23
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The point is that on opening the first to open see no stress. The last of the contacts to open sees the full duty of trying to break the circuit.
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Old 30th August 2012, 06:24 AM   #24
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Quote:
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The point is that on opening the first to open see no stress. The last of the contacts to open sees the full duty of trying to break the circuit.
It's bad from safety perspective, if it welds. May be we can factor that while selecting individual contact rating.

But isn't it good from long term degradation perspective? Because it's likely that only a single contact will continue to get corroded and the other contact will continue to provide clean signal path to low load?
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Old 30th August 2012, 10:20 AM   #25
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You could be right.
Do some long term tests and come back with the results and your methods of getting those results.
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Old 4th September 2012, 03:07 AM   #26
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If one contact can weld, then you don't have enough contact, imo.

Also the type of the contact shape matters, as does the contact material... crossbar is likely best for audio, IF you could get it...

My thinking is that no matter what the contact being used, more in parallel will provide substantial reductions in terms of the issues inherent in relay contacts. One can assume for the benefit of discussion that we are comparing one "adequate" contact to multiple contacts ("overkill").

I prefer the "overkill" approach, IF the signal is required to flow through the contacts, as opposed to being a path to shunt a signal to ground for turning off the signal path/flow... (that's not the same as providing a path to ground that will enable a circuit to operate).

Just my experience talking here, that and what I have read in passing.

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