Replacement Of Hrc Fuses - ABB ZX0 Manual For Installation And Operation

4.3.5

Replacement of HRC fuses

Blowing of a fuse is indicated mechanically (figure 4.3.5.1).
Blowing of a fuse results in automatic tripping of the switch-dis-
connector. The switch position indicator (2) shows the OFF posi-
tion of the switch-disconnector.
Conditions for replacement of a fuse:
?
After a fuse has blown, the actuating shaft of the
switch-disconnector has to be returned to the
OFF position manually.
− Pull the selector slide (1) outwards, press it up towards the
switch-disconnector symbol and hold it fast.
− Plug the operating lever onto the hexagon through the
released opening (4) in the door.
− Turn the operating lever approx. 90° counter-clockwise
until the shaft engages.
Fig. 4.3.5.1: Fuse blown indication
56 | Manual ZX0 HB 600 en - Revision 05
Earth the outgoing feeder of the panel concerned as
follows (figure 4.3.5.1):
− Comply with the safety regulations to EN 50110.
− Pull the selector slide (1) outwards, press it down towards
the earthing switch symbol and hold it fast.
− Plug the operating lever onto the hexagon through the
released opening (5) in the door.
− Turn the operating lever approx. 90° clockwise – the outgo-
ing feeder is then earthed.
− Secure the working area as described in section 4 and EN
50110 standard.
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Always replace all three fuses in a panel, even if
only one or two fuses have blown.
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Use fuses from ABB or from the manufacturer
Siba in accordance with tables 4.3.5.1 to 4.3.5.3.
The fuse boxes are designed for a maximum fuse length of
442 mm and a maximum fuse diameter of 67 mm. Use adapt-
ers for smaller dimensions (see list of accessories).
1
2
4
3
5
Detail A
A
1
2
3
4
5
Selector slide
Switch position indicator for disconnector
Switch position indicator for earthing switch
Opening for disconnector operation
Opening for earthing switch operation