silver alloy contacts in relay

[jarthel]

what are they really made of?

some models of the same manufacturer specify silver cadmium oxide, others are listed as silver/nickel (90/10) and etc.

I want to use the relay for speaker protection so I'm looking at which are suitable.

thank you.

 

[EchoWars]

I'd say that it likely doesn't matter.

But, many amplifier designers have pondered the same questions, and ended up using relays such as the Omron LY2 and MY4. If you have room, use one relay for each channel, and run all the contacts of each relay in parallel for current carrying capability.

 

[AndrewT]

Hi,
relays do not like breaking high DC currents.
Supplement the output relay with close rated supply line fuses.
If you can, add an input mute that cuts the normal AC signal at the output relay before it opens.

 

[jarthel]

to andrew: how is the fuse connected?

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to echowars: why 1 relay per channel?

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thank you for the help

 

[AndrewT]

Hi,
the supply fuses could be at the PSU if there is no provision on the amp PCB.
Or even in line fuses could be used.

 

[EchoWars]

to andrew: how is the fuse connected?

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to echowars: why 1 relay per channel?

If you have the room for two relays, why not? Current-carrying capacity is an issue, so dedicate one relay to each channel and make it a non-issue.