
CD Automation srl
MULTIDRIVE-1PH 850A
User’s Manual
58
13
Internal Fuse
The MULTIDRIVE thyristor unit have internal fuse extrarapid at low I²t for the thyristor protection of
against the short-circuits.
The fuse must have I²t lower than the thyristor one (I²t max)
Caution:
USE
ONLY
EXTRARAPID
FUSE
WITH
APPROPRIATE
I²
T
13.1
Fuse Code
200 kARMS Symmetrical A.I.C.
Size
Fuse CODE
Current
(A RMS)
I²T
(A²sec)
Vac
Qty
850A
FU2x550FMM
900
420000
660
2
Caution:
The Fuses must have I²t 20% less than thyristor's I²t.
Caution:
High speed fuses are used only for the thyristor protection and can not be used to
protect the installation.
Caution:
The warranty of thyristor is null if no proper fuses are used. See tab.
Warning:
The user installation must be protected by electromagnetic circuit breaker or by
fuse isolator.