[Excaliber]

Interesting observation Jerry, it would depend on the 'load' at time of testing to determine any substantial drop from positive to negative. But the theory is solid, less draw on the negative side. But in the case of a major 'fault' (short) it wouldn't make any difference anyway. I can't imagine the difference in 'draw' being enough to warrant a larger switch on the positive side, same switch should work fine in either direction.