For some time I've wanted to use a 12V Pre-amp trigger to switch mains power to my 6 power amps.

Marmitek in socket X10 devices are out as they won't handle the current.

The obvious choice is a relay driving a 4 way extension socket, I might however need to implement a delay for each socket as the amps have quite a high in-rush current and I think switching all 6 on at once might trip the circuit breaker. (I'll have to check).

Is there something commercially available or am I going to have to ask one of the more knowledgeable members to put something together for me?