Fine. However, I was thinking there should be a relay configuration which has two poles, plus a nominal state in which neither pole is connected. Is there a common name for this, or must one create one out of combinations of relays like an h-bridge?
Well you could do this with what is known as a carpenter relay
He wasn't asking where to get one, he was asking what it was called.
if such a thing did exist today I would certainly be interested in checking on price and availability.