For grounding and protection of multi-switches or amplifiers.It is statistically proven that strong atmospheric disturbances occur more frequently. Each year, approximately two million flash of lightning touch Germany. They generate100,000 A (100 kA) current and 10 million volts (10 MV) of voltage. But even lightening in the proximate environment can still have an influence on the antenna system with significant field strengths. Usually before this, people protect their buildings by a lightning protection system and overvoltage protection devices.The threat from electronic devices due to strong electromagnetic shock fields that build up in pulses, is still far more common than a direct strike of lightning. Insurance companies have asserted that with around 11000 electronic damages, the "overvoltage" as cause of damage was 33% the common factor.The devices with internal lightning protection and potential compensation are protected against such damages. It induces the voltage which is in