Hi Norbert,
the overvoltage protector is a diode which will produce a shortage (0 ohms) as soon as the voltage exceeds 6,8V.
Therefor the diode has to be operated in reverse mode, meaning the cathode (grey ring)has to be connected to + V.
Hope this clarifies your question.
BTW that´s a well made investment to protect all circuitry from overvoltage and should be inserted in any supply line within the cockpit.
Best rgds
Peter
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