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Installation and Connection
42 | CTW900
Table 5.2
– Recommended Fuses for the Protection of the Armature Input Circuit (AC side)
Fuse
CTW900
Model
Rated Current
[A]
I
2
t Maximum
[A
2
s]
WEG Model
Reference
Code
20A
25
6,000
FNH00-25K-A
10701722
50A
63
6,000
FNH00-63K-A
10705764
90A
125
8,000
FNH00-125K-A
10707231
125A
160
11,000
FNH00-160K-A
10701724
180A
250
73,000
FNH00-250K-A
10711445
260A
350
63,000
FNH1-350K-A
10814896
480A
710
240,000
FNH2-710K-A
11393547
640A
800
300,000
FNH3-800K-A
1
10833726
1000A
1250
900,000
–
1500A
(Circuit Breaker)
–
2000A
(Circuit Breaker)
–
Table 5.3
– Recommended Fuses for the Protection of the Armature Output Circuit (for 4-Q converter)
Fuse
CTW900
Model
Rated Current
[A]
I
2
t maximum
[A
2
s]
WEG Model
Reference
Code
20A
35
6,000
FNH00-35K-A
10701721
50A
63
6,000
FNH00-63K-A
10705764
90A
125
8,000
FNH00-125K-A
10707231
125A
200
11,000
FNH1-200K-A
10809133
180A
315
73,000
FNH1-315K-A
10809575
260A
400
63,000
FNH3-400K-A
10831217
480A
710
240,000
FNH3-710K-A
1
10833591
640A
900
300,000
–
1000A
1250
900,000
–
1500A
(Circuit Breaker)
–
2000A
(Circuit Breaker)
–
NOTE!
On the 1500A and 2000A models, circuit breakers must be used to protect the installation,
because the converter already has internal fuses in each arm of the armature bridge (no additional
external fuses are needed).
Follow the list of fuses used inside the models of Size D (1500A and 2000A).
Table 5.4
– Fuses Used Inside Converters of Size D
Fuse
CTW900 Model
Rated
Current [A]
Rated
Voltage [V]
Reference
WEG
Code
1500A / 500Vac
1100
690
FNH3FEM-1100Y-A (WEG)
12661664
2000A / 500Vac
1100
690
FNH3FEM-1400Y-A (WEG)
12661666
1500A / 990Vac
1250
1250
170M6499 (Cooper Bussman)
12943531
2000A / 990Vac
1250
1250
170M6501 (Cooper Bussman)
12943530
When the field bridge is supplied externally as described in section 5.3.2, ultra fast fuses must be used at the
circuit input, dimensioned according to Table 5.5.
1
In order to prevent unintentional actuation, these models must not be mounted on disconnecting switch.
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