Surge Protection Device SPD for installation in low-voltage distribution board.
The orange module contains a metal-oxide varistor MOV providing overvoltage protection between L-N terminals. The blue module contains a gas-discharge tube GDT providing protection between N-PE terminals. The modules are plugged into the base (also orange), which provides the screw terminals for neutral N, live L and protective earth PE.
imo_spd_40-275_surge_protection_device_e-magnetica.jpg
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