supply of supply of class b & c surge protection device.supply of class b & c surge protection device.,supply of class b & c surge protection device (spd) -type i & ii with visual indication and po tential free contact to remote monitoring as per specification no. rdso/spn/165/2023 ver 4.0 or latest and iec standard 61643 or latest and iec 62304-5 or latest for single phase 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 or vde certified as per latest iec 61643-11-2011 standard or latest. class b & c surge protection device required with three modules only. [ warranty period: 30 months after the date of delivery ] ] , supply of class b & c surge protection device (spd) -type i & ii with visual indication and po tential free contact to remote monitoring as per specification no. rdso/spn/165/2023 ver 4.0 or latest and iec standard 61643 or latest and iec 62304-5 or latest for single phase 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 or vde certified as per latest iec 61643-11-2011 standard or latest. class b & c surge protection device required with three modules only. [ warranty period: 30 months after the date of delivery ] ] , supply of class b & c surge protection device (spd) -type i & ii with visual indication and po tential free contact to remote monitoring as per specification no. rdso/spn/165/2023 ver 4.0 or latest and iec standard 61643 or latest and iec 62304-5 or latest for single phase 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.