DS DS/EN 61643-21/A1
DS DSEN 61643-21A1 2009-JUN-12 Low voltage surge protectve devces - Part 21 Surge protectve devces connected to telecommuncatons and sgnallng networks - Performance requrements and testng methods
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Is applicable to devices for surge protection of telecommunications and signalling networks against indirect and direct effects of lightning or other transient overvoltages. The purpose of these SPDs is to protect modern electronic equipment connected to telecommunications and signalling networks with nominal system voltags up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c.