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
Intellitec has been making latching battery disconnects for the RV market for many years that use no power to maintain position. They use a single coil and simply reverse the current to latch or unlatch the contacts using a pivoting magnetic rod. I think their largest model is only 200 amps continuous though.
