[NLRS] Goof proof powering of transverters?

[James French]

Hello Everyone.

I was informed today that the NLRS had a relay board that would GOOF proof 
powering of transverters. Is that true?

What I need is a GOOF proof way for providing 12V power for my transverters so 
that I can't reverse the polarity to them as I have done even with powerpoles.

Yes, I am one of those persons that can still zap something electronic even if 
there is only one way to plug it in and have explicit instructions telling me 
how to hook things up....:(

Thanks in advance,

James W8ISS