Siemens NXAIR M Operating Instructions Manual page 92

Operating the circuit-breaker panel with HV HRC fuse
Replacing HV HRC fuse-links
Preconditions

Set of proper HV HRC fuse-links available

Withdrawable circuit breaker / fuse combination taken out of the panel

High-voltage door closed
Procedure
When the withdrawable part is taken out of the panel, fuse assemblies are accessible for the replacement of
the HV HRC fuse-links.
92
NOTICE
Undetected damage
Tripped HV HRC fuse-links can cause hidden damages on the other
HV HRC fuse-links.
Always replace all HV HRC fuse-links, even if only one HV HRC fuse-link
has tripped.
HINT
Electrical indication of tripped fuse-links
Electrical indications at the panel or in the remote control room are not
automatically reset to operating mode by replacing the HV HRC fuse-links.
HINT
Recommended order of action
The HV HRC fuse-link in the middle phase L2 are only accessible after removing
the HV HRC fuse-links from the neighboring phase L1 or L3.
First, remove the HV HRC fuse-links from the outer phases L1 and L3 on
the left and right side of the circuit breaker / fuse combination. Then go on
to remove the HV HRC fuse-links from the middle phase L2.
HINT
Hereafter, the disassembly of those parts is described, which are later assembled
again at the same place.
Store disassembled parts carefully and keeps them available for later
reuse.
NXAIR M 139-2021.9 / 07