Replacing Hv Hrc Fuse-Links - Siemens NXAIR Operating Instructions Manual

Operating the contactor panel with panel width 435 mm
Interlocking the contactor truck with the panel
Interlock the contactor truck with the panel by turning the two locking levers to the inside.
The contactor truck is correctly interlocked with the panel as soon as both locking levers
latch tight inside.
Fig. 242: Interlocking the contactor truck
✓
The contactor truck is inserted in the panel and the high-voltage door is closed.

13.18 Replacing 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.
It must therefore already be ensured during configuration of the switching devices and selection of the
HV HRC fuse-link that only such fuse-links are used, which either satisfy the above operating conditions, or
whose breaking capacity was tested at least with the maximum system voltage.
In case of doubt, a suitable HV HRC fuse-link must be selected together with the fuse-link manufacturer.
138
CAUTION
Burns
After tripping, the surfaces of HV HRC fuse-links are hot. Touching hot HV HRC
fuse-links may cause burns.
Put on personal protective equipment.
Let hot HV HRC fuse-links cool down before replacing.
NXAIR / ≤ 40 kA
Fig. 243: Contactor truck locked
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