For EMI / EMC Engineers
IEC 61643-21:2000+A1:2008+A2:2012 is applicable to devices for surge protection of telecommunications and signaling 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 signaling networks with nominal system voltages up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c.
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