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I think it might be better, now that I thought about it some more, to either use a SSR instead of a mechanical relay to cut down on the time it takes to shut down power, or to wire a mechanical relay with a blocking diode so it energizes with correct polarity and block power to the amp until the relay has time to trip
In series with that back-biased diode, add the coil of a relay. The coil will limit the amount of current passing through the diode. Then, have the relay break the power connection to the rest of the circuit and maybe light-up a red LED to show the fault condition.
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