Supply and installation of Class B and C Surge protection Device [SPD] - Type I and II with Visual Indication and Potential free contact to remote monitoring as per Specification No. RDSO/SPN/165/2012 Ver 3.0 or latest and IEC standard 61643 for Single line 230V AC application with handling Lightning surges of 10/350 microseconds and Switching surges of 8/20 microseconds .One Set consists of 3 nos. of SPD [2 No. of B Class [L-N, N-E] and one no. of C Class [L-N] all enclosed in a Box with KEMA