On one circuit breaker I have a manual switch. On the second circuit breaker I have a motion sensing switch (using a mechanical relay). I have a number of lights wired in parallel as the load. The lights should turn on as a result of motion or manually turning them on. Unfortunately I can't just wire the two switches in parallel on the same breaker because of physical constraints; I'd have to perform a major renovation to rewire.
It seems I need a sort of DPDT relay like this, which is normally open, has two magnetic coils, and keeps both circuits separate:
Does a relay like this exist? Is this the correct way to solve this problem?