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EN IEC 60947-9-1:2019 Standard

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  Keywords:

#current #intended #circuit #aqds #assemblies

  Directive

Electromagnetic compatibility (EMC) Directive (2014/30/EU)

  Last Official Journal reference

Friday 10th of June 2022

  Description:

Low-voltage switchgear and controlgear - Part 9-1: Active arc-fault mitigation systems - Arc quenching devices

  Purpose

This part of IEC 60947 covers low-voltage arc quenching devices, hereinafter referred to as AQDs, which are intended to eliminate arc-faults in low-voltage assemblies (typically lowvoltage 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. This document does not cover: • sensors intended to detect arc-faults; • devices intended to trigger the functioning of the arc quenching device; • devices intended to interrupt arc-fault current; • special requirements for AQDs for use in explosive atmospheres (e.g. ATEX).

  Publication

Monday 18th of May 2020

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