This is a magnetic phone charger. It's a USB cable that plugs into a standard 5V phone-type charger. The magnetic "plug" has a (+) center-pin and a (-) round metal as the ground with a magnet behind it. The receiving load-side "socket" mirrors the power-supply plug by having a spring-loaded (+) center-pin and also (-) metal ring as the ground with a magnet behind it. Has no (D+/D-) data lines, only power.
Unfortunately, (with some deliberate effort) I have discovered that the physical design DOES ALLOW for an inadvertent short-circuit by having the "plug's" center-pin touch the round ground metal of the mating "socket" while at the same time it's own round metal ground touching the center-pin of the "socket".
I can protect the receiving load circuit with a diode, or a MOSFET, or other common reverse-current/voltage protection. But is there any way to prevent the power-supply itself from getting shorted out? The 5V power-supply/charger can be anything, since this is just a USB cable.
The only way I can think of protecting a connected 5V power supply/charger (let's assume it does not have one built-in) is to somehow channel away/absorb the short-circuit current somewhere on the receiving load side of the circuit by offering a lower path of resistance, while also making sure that the load-side of the circuit is not damaged either.
What say you?