Select a relay to operate with the reverse-polarity voltage. For example, use a 12V relay for a 12V supply system. When you apply correct polarity to the circuit, D 1 becomes reverse-biased, and the S ...

A previously-published Design Idea outlined a polarity protection circuit that provides the correct connection of the battery to a load regardless of the battery’s orientation in its holder. The ...

2. In circuit examples involving a 100-μF load and similar rise times, a discrete implementation results in inrush current exceeding 400 mA, while the integrated power switch limits inrush to 200 mA.

Protection circuits don’t block reverse polarity because they’re meant to be paired with cells – which does break in the “18650 in a holder” situation where you can reverse polarity and ...