Specifications
2.5 INTERNAL HIGH SPEED FUSE REPLACEMENT
The 451 series static contactors and the 455 and 461 series power units (nominal currents
from 15 to 125 A) are equipped with
internal
high speed fuses.
They are fitted at the rear of the pull-out module.
For the 150 A nominal current, the high speed fuse and its support are
external
and
driven separately from the thyristor unit.
Important
The high speed fuses are only used to protect the thyristors against
over-loads of wide amplitudes.
The user's installation must be protected (non-high speed fuses,
thermal, magnetic or electromagnetic circuit breaker, suitable
isolating switch) and comply with applicable standards.
In the event of
blow-out
of the internal fuse, a
red indicator light
on the front panel of
the unit lights up (except for the 150 A nominal unit).
The fuse can be accessed via the rear of the module.
To replace the fuse:
• pull out the module from its baseplate
• unfasten the 2 fuse attachment screws
• fit the suitable fuse (the references of which are given in the
table overleaf).
Tightening torque 3.5 N.m.
451 -461 User Manual
2-7
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