500-8067.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • Revision 05 37/121
Description
8.11 Selection of HV HRC fuse-links
Note to HV HRC fuse-links According to IEC 60282-1 (2009) Clause 6.6, the breaking capacity of HV HRC fuse-links is
tested within the scope of the type test at 87% of their rated voltage.
In three-phase systems with resonance-earthed or isolated neutral, under double earth fault
and other conditions, the full phase-to-phase voltage may be available at the HV HRC fuse-link
during breaking. Depending on the size of the operating voltage of such a system, this applied
voltage may then exceed 87% of the rated voltage.
To be observed during configuration of switching devices and selection of HV HRC fuse-links:
• Use only fuse-links satisfying the stated operating conditions.
• Use only fuse-links whose breaking capacity was tested at least with the maximum system
voltage.
In case of doubt, select a suitable HV HRC fuse-link together with the manufacturer.
Allocation of HV HRC fuses and transformers
The three-position switch-disconnector in the transformer feeder (transformer switch) was
combined with HV HRC fuse-links and tested in accordance with IEC 62271-105.
The following transformer protection table shows HV HRC fuse-links tested by Siemens, which
are recommended for transformer protection.
The protection table applies to:
• Maximum ambient air temperature in the switchgear room of 40 °C according to
IEC 62271-1 considering the influence of the switchgear enclosure
• Requirements according to IEC 62271-105
• Protection of distribution transformers according to IEC 60787
• Rated power of transformer (no overload operation)
The specified HV HRC fuse-links make SIBA are type-tested back-up fuses according to
IEC 60282-1. The dimensions conform to DIN 43625.
The HV HRC fuse-links have a thermal protection in form of a temperature-limiting striker
tripping operating in case of defective HV HRC fuse-links or high overload currents.
Please contact your regional Siemens representative if you want to use HV HRC fuse-links from
other manufacturers.
Basis for selection of HV HRC fuse-links:
• IEC 60282-1
• IEC 62271-105
• IEC 60787
• Recommendations and data sheets of fuse manufacturers
• Permissible power loss in the switchgear enclosure at an ambient air temperature of 40° C
ATTENTION
Please use only fuses tested by Siemens, which are listed in the following fuse tables.
➭ The use of other fuse types must be checked by Siemens in advance. Please contact the
regional Siemens representative.
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