Hi,
all VBars are protected in a way so if you connect a standard 3-pin-servo connector reversed, nothing will happen, no damage, it will simply not work (battery or servo).
Sat ports are hardware-coded, you would need extensive force to insert a JST type sat or telemetry connector the wrong way.
If you leave a power supply connected reversed for a longer time, the protection _could_ heat up sufficiently to take damage, but during my own tests, I did not find a way to permanently damage a VBar unless I reverse voltage, or connect r/c voltage to the telemetry or (gyro) sensor port.
So if you genuinely reverse polarity (e.g. 2-pin BEC-type power connector), there is no protection.
On the servo side, there is much margin for over voltage, afaik you could even connect a 6s directly, and the VBar itself would not instantly take damage.
On the telemetry ports and on the gyro sensor port, you are on the 3.3 V circuit, significantly higher voltage (e.g. r/c voltage 4.8-8.4 V) would instantly cause damage.
Kind regards
Eddi
Born to fly ...
forced to work.