IEC 61643-21Low voltage surge protective devices - Part 21: Surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods MIG2412SPDCWG Hybrid Generator 1.2/50 up to 24kV and 8/20 up to 12kA with 2 and 40 Ohm Rs MIG2412SPD CTS-1035010/350us Impulse current generator CTS-10350 Testing low-voltage surge protection devices (SPDs) for telecom networksIEC / EN productIEC 61643-21