SPC is lightning and surge arrester type 1+2 according to EN 61643-11. These are recommended for use in the Lightning Protection Zones Concept at the boundaries of LPZ 0 – 1 (according to IEC 1312-1 and EN 62305) for lightning current equipotential bonding and elimination of switching surges that originate in power supply systems entering the building.
The SPC 12,5 is intended for use in TNC systems (1+0 or 3+0). For TNS and TT systems (1+1 or 3+1) the SPC 12,5 is equipped with high energy gas discharge tube for equipotential bonding between N and PE.
The main use of SPC12,5 arrester is in structures of LPL II according to EN 62305, e.g. industrial and administration buildings, schools, supermarkets and cathedrals.
Function of remote monitor terminals
When the SPC12,5 DS is operating correctly, the terminations 1-2 are connected to normally closed contacts, 2-3 are normally open. If the internal varistor component is damaged as a result of thermal overloading, terminations 1-2 will then be open and 2-3 closed.