IEC 60947-9-1:2019 covers low-voltage arc quenching devices, hereinafter referred to as AQDs, which are intended to eliminate arc-faults in low-voltage assemblies (typically low-voltage switchgear and controlgear assemblies in accordance with the IEC 61439 series), by creating a lower impedance current path, to cause the arcing current to transfer to the new current path. This new current path is maintained until a short-circuit protection device (SCPD) interrupts the short-circuit current.AQDs are installed in low-voltage assemblies, connected to the main circuit, preferably as close as possible to all primary power sources.Their rated voltage does not exceed 1 000 V AC or 1 500 V DC.
Document identifier
IEC 60947-9-1 Ed. 1.0 b:2019
Title
Low-voltage switchgear and controlgear - Part 9-1: Active arc-fault mitigation systems - Arc quenching devices
IEC Category
SC 121A: Low-voltage switchgear and controlgear
Publication date
2019-01-16
International Relationship
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117 vnd |
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