• MCA-20 has been developed for protection of 3-phase AC power transmission overhead lines with maximum operating voltage of 24 kV with bare and covered conductors against induced lightning overvoltages and their consequences. • One of the biggest advantage of MCA-20 is its capability to withstand direct lightning strikes (DLS) without destruction and with preservation of induced lightning overvoltage’s protection properties. • MCA-20 should be installed on each pole with phase alternation.