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Energy coordination is the selective interaction of all surge limiting modules in an electrical installation. Of course, this includes SPDs installed at the boundaries of lightning protection zones. Moreover, energy-coordinated surge protection starts with the SPD Type 1 at the service entrance and ends at, or better within, the device to be protected. Energy coordination is not only serial mounting of surge arresters into electrical installations ac

Energy Coordination Lightning Protection Zone 1 Terminal Red/Line M device Type 3 Combined lightning current and surge arrester Terminal Red/Line Red/Line DEHNbloc ® M device Type 3 Type 2 DEHNgap M Coordinated lightning current arrester Terminal Red/Line Red/Line device Type 3 Type 2 Lightning current arrester

Internal design of DEHNventil ® TT

DEHNgap BN DEHNgap M N-PE spark gap

N-PE Surge Arresters Type 1 Lightning Protection Zones 0 A/1 and 0 A/2 DEHN + SÖHNE has been using 3+1 circuits for TT systems already for more than 20 years. The three phase conductors are connected with e.g. DEHNbloc M to the neutral conductor via creepage discharge spark gaps – an N-PE spark gap is installed between the neutral conductor and the protective conductor. This type of circuit has also met the approval of international standard committees withi