IEC 60947-9-1
Low-voltage switchgear and controlgear -Part 9-1: Active arc-fault mitigation systems - Arc quenching devices
Organization: | IEC |
Publication Date: | 1 January 2019 |
Status: | active |
Page Count: | 42 |
ICS Code (Low voltage switchgear and controlgear): | 29.130.20 |
ICS Code (Switches): | 29.120.40 |
scope:
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).
Document History
