Buy SPC PV-1000 DS Lightning Arrester of type 1+2 as per EN 61643-11. At the time of surge effects, this device can safeguard positive and negative busbars of photovoltaic systems. IEC 1312-1and EN 62305 standards are followed when it is used in the Lightning Protection Zones Concept at the LPZ 0-1 boundaries. Varistor sectors which are connected between L+, L- and PE terminals have internal disconnectors which active on the event of v overheat or failure. Both, mechanical and remote monitoring methods are used to indicate failure of disconnectors. The terminations 1-2 of SPC PV DS are connected to normally closed contacts, while 2-3 terminations are normally open. In case of any damage that occurs to the internal varistor component, terminations 2-3 will then be closed and terminations 1-2 open.