We are offering three phase class c surge protection device, surge arresters slp-275 v3+1 slp-275 v3s+1 spd type 2 – surge arrester replaceable module, visual fault signaling combination of 3-pole varistor surge protection and an encapsulated spark gap connected in the mode 3+1. To be installed in low-voltage distributions at the boundary of lpz 1 and lpz 2 zones to protect distributions and equipment against the overvoltage effects induced during a lightning strike and to prevent switching overvoltage. Optional remote status signalling (s).