Recommended · for some experience
Polarised Solar DC Circuit Breakers - Reverse Polarity
Why people recommend it
Demonstrates a polarised DC breaker failing when wired in reverse, with the arc sustained inside it; cited when people ask whether breaker polarity matters in battery systems.
Watch for: the reverse-polarity failure demonstration
In their words
In this video you see solar being used as a current-limited source to test a breaker; there's nothing wrong with the dead short since the source is solar.
Harper - Reinstate Monica on electronics.stackexchange.com, May 2022. CC BY-SA.
The video cited above shows a breaker being destroyed by reverse current arcing.
Russell McMahon on electronics.stackexchange.com, Nov 2022. CC BY-SA.
