Cover E DIN EN IEC 60947-9-2 VDE 0660-121:2021-03
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E DIN EN IEC 60947-9-2 VDE 0660-121:2021-03

* German Language Version *

Low-voltage switchgear and controlgear – Active arc-fault mitigation systems

Part 9-2: Optical-based internal arc-detection and mitigation devices

(IEC 121A/338/CDV:2020); German and English version prEN IEC 60947-9-2:2020
Class/Status: Draft, valid
Released: 2021-03   Published: 2021-02-05
VDE Art. No.: 1600339
End of objection deadline: 2021-04-05

This document covers internal arc-fault control devices, hereinafter referred to as IACD, which are intended to:
- detect internal arc-faults in low-voltage switchgear and controlgear assemblies, by processing (at least) optical effect of an internal arc-fault, and
- operate mitigation device (either external or combined)
in order to minimize the effects of the internal arc-fault (see Figure 1).