| Description de l'article | Overvoltage protection / overvoltage protection type 1+2+3 (b+c+d) according to EN 61643-11:2012 / pom i 3 75KA 280V/25KA is used for protection of mains and appliances against the effects of overvoltage wave caused by a close, direct or indirect lightning hit. Connected TN-c, 3 phase, 4 wire system (L1, L2, L3 and pen). Designed as one monoblock with varistors. High diverting capability provided by power varistors mov. Mounting is on DIN rail TS35 MM. Usage as the 1ST level ( T1, coarse protection) in a 3-LEVEL overvoltage protection concept. It provides overvoltage protection for appliances installed in the main distributor in the range of T1, T2, T3 (coarse, medium and fine protection).pom i 3 75KA 280V/25KA is used for protection of mains and appliances against the effects of overvoltage wave caused by a close, direct or indirect lightning hit. Usage as the 1ST level ( T1, coarse pro |