Headscratcher Grade Relays?
https://www.delcity.net/store/Hi!Amp,-Bi!Stable-Relays/p_824650.h_824651?utm_campaign=New%20Product&utm_source=hs_email&utm_medium=email&utm_content=59907868&_hsenc=p2ANqtz-_d0VaT67oYQAzv93zEhMRiN7_gE...
Forum Discussion
MEXICOWANDERER wrote:
Coils are used for magnetics to retain contact points in a spring pressure relative position. The nomenclature says "No Power Needed". Or does it?
Thus, say in any latching relay circuit one coil has to remain energized.
The vendor is clearly unclear on this...
It's a different relay design. Think of it more as an ordinary toggle switch with a couple of solenoids to pull it one way or the other (or, equally likely, a single coil and a permanent magnet such that the direction of travel is determined by the polarity of DC power applied to the coil). In either steady state the contacts are maintained by spring pressure, not by electromagnetics.
The battery shutoff switching arrangements commonly supplied in RVs are of this general description. They do use power only when changing state (well, mine also has a "connected" pilot light that uses a bit of power I suppose, but that's not part of the relay proper).
