REVO S
1PH from 300A to 800A
User’s manual
31
Internal Fuse
The thyristor unit have internal fuse extrarapid at low I²t for the thyristor protection of against the short-circuits.
The Fuses must have I²t 20% less than thyristor’s I²t. The warranty of thyristor is null if no proper fuses are used.
Size
200 kA
RMS
Symmetrical A.I.C.
Quantity
for each
phase
Fuse CODE
Total
Current
(A
RMS
)
FUSE I
2
t value
Suggested A2s
(at 500V)*
FUSE I
2
t value
Suggested A2s
(at 660V)
Vac
300A (S12)
FUFM350
350
73500
105000
660
1
400A (S12)
FUFMM550.2
550
150500
215000
660
1
500A (S12)
FUFMM700
700
294000
420000
660
1
600A (S12)
FU2055920.250
1000
246400
352000
660
4
700A (S12)
FU2055920.250
1000
246400
352000
660
4
800A (S15)
FU2055920.250
1000
246400
352000
660
4
*I
2
T are multiplied for K value in function of Vac at
500V K is equal to 0,7 (ex:105000 x 0,7 = 73500).
At 660Vac K is equal to 1.
Fuses replacement:
Open the cover and remove
the screws, then replace it with the correct fuse, use
the screws with a proper suggested torque indicated
below
Type
Screw
Torque
Lb-in (N-m)
300-800A
M8
133.7 (15.0)
12
1.2
1.0
0.8
0.6
0.4
0.2
200 400 600 800
0.7
500
Vac
K
(Line voltage)
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:
When it is supply, the Thyristor unit is subject to dangerous voltage, don’t open the
Fuse-holder module and don’t touch the electric equipments.
