A range of 12V Bosch voltage regulators. Available for different current ratings. Work by regulating to earth. Not suitable for use with Lucas dynamos. (Manufactured in Germany).
These generator regulators are electronic regulators within a historic housing. The electronics make it possible to reliably control voltage and current free of wear. The on board electrical system is thereby protected from over voltage, and the generator is not overloaded. The battery is also kept from overheating. The regulator housing is sealed against dust and pressure waterproof (according to IP69K) and can therefore also be mounted at an exposed location.