Page 7 - 24_DS241_E_0315_Reliable_Power

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Fibre optic sensors are installed to detect the arc fault along all
live parts of a switchgear assembly where ignition of an arc fault is
to be expected.

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4

Optoelectronic sensors monitor a large detection area
and are positioned in every compartment of a switchgear
assembly.
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Current transformers detect the overcurrent resulting
Product features:
from an arc fault. They are positioned upstream of the
• Arc fault quenching within a few milliseconds incoming circuit breaker.
via power thyristors
• Detection devices at the front of the switchgear 4
assembly
• Modular system
• Activation of the quenching devices via fibre
optic cables
• Compact system components

IEC TR 61641*
• Regulates the prerequisites for testing the arc
fault resistance of low-voltage switchgear Detection devices are installed at the front of the switchgear
assembly with the aim of ensuring the assembly and LEDs indicate the current status of the system.
protection of persons and systems
IEC 60364-4-42**
• Regulates how to prevent arc faults in case of 5
special fire protection requirements
IEC 60364-5-5***
• Additionally applies if not only fire protection,
but also availability requirements must be met

Quenching devices are preferably positioned in the
vicinity of the supply switch.

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