Are you certain your AC outlet is grounded?
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Krell makes a "Krell Link" that you can use for delayed startup. I use it on my system so the pre-amp starts first, them the amp. These amps draw a lot of current when they first fire up. It may be not getting enough juice at startup and shuts itself off. Perhaps try starting the one amp by itself and see if it stays on. If not, could be the amp of course. If you feel you need service there is a fellow that used to work at Krell that has a repair facility. I believe it is The Service Center, owner Steve Lacrone (spelling?).Google it. He is very helpful.
It is a major issue because that breaker is the amplifier/speaker protection. If the breaker trips with the speakers connected and stays on with the speaker cables disconnected, it is probably a short in the speaker and not an amplifier issue. If it trips without the speakers connected then it's an amplifier issue (i.e., DC at the output, internal short or part of the protection circuitry damaged).
It's going to need service to find the cause. A local repair guy may not be able to help without a schematic.