I’m building a couple of 12 and 24 v boxes. For camping etc wondering how to build in a low / high voltage cutoff with DIYbms
Circuit breaker with a shunt trip seems to be the way to go attached to the relay, something like this: https://www.ebay.com/itm/ABB-SACE-S3-S3B-3-Pole-225A-240VAC-Circuit-Breaker-Shunt-Trip-Aux-Switch-TESTED/132336226104
They do come up cheaper and if you don’t need the really high amps, I got 2 for $240 if you’re patient.
I’ve heard Stuart mentioning contactors in the past to achieve high current cut-out more cheaply.
Some commercial BMS are using them.
this is some cheaper 12 volt boxes im playing with have shunt trip on my batrium
It is only AC rated
