72
• Application diagrams
8.18
Short Circuit Protection
8.18.1
Type 1 Coordination
For Type 1 coordination either aM type fuses or Circuit breakers can be applied as shown in the tables below:
8.18.1.1
Type 1 Coordination with GE Circuit Breakers:
GE Circuit Breaker
Soft Starter
Rated Current
O/L
Breaking
Capacity
A
A
Frame Type
O/L Type
KA
8 16 FD63 LTMD
16 65
17 40 FD63 LTMD
40 65
31 50 FD63 LTMD
50 65
44 63 FD160 LTMD
63 65
58 80 FD160 LTMD
80 65
72 80 FE160 LTMD
80 65
85 125 FE160 SMR1-125 65
105 160 FE160 SMR1-160 65
145 160 FE160 LTMD
160 65
170 250 FE250 LTMD
250 65
210 250 FE250 LTMD
250 65
310 400 FG630 SMR1-400 65
390 400 FG400 SMR1-400 65
460 630 FG630 SMR1-630 65
580 630 FG630 SMR1-630 65
650 800 FK800 SMR1s-800 50
820 1250 FK1250 SMR1s-1250 50
950 1250 FK1250 SMR1s-1250 50
1100 1250 FK1250 SMR1s-1250 50
1400 1600 FK1600 SMR1s-1600 50
8.18.1.2
Type 1 Coordination with Type aM Siba Fuses:
SIBA aM Fuses
Soft Starter
Rated Current
Rated
Current
Breaking
Capacity
A A P/No.
Size
Un
Type
KA
8
16
20 477 08.16
000
690
aM
120
17
20
20 477 08.20
000
690
aM
120
31
35
20 477 08.35
000
690
aM
120
44
50
20 477 08.50
00
690
aM
120
58
80
20 209 08.80
00
690
aM
120
72
100
20 209 08.100
00
690
aM
120
85
125
20 209 08.125
00
690
aM
120
105
160
20 210 08.160
0
690
aM
120
145
200
20 211 08.200
1
690
aM
120
170
200
20 211 08.200
1
690
aM
120
210
250
20 211 08.250
1
690
aM
120
310
400
20 212 08.400
2
690
aM
120
390
500
20 213 08.500
3
690
aM
120
460
630
20 213 08.630
3
690
aM
120
580
800
20 225 08.800
4
690
aM
120
650
800
20 225 08.800
4
690
aM
120
820
1000
20 225 08.1000
4
690
aM
120
950 2x630
2x20
213
08.630
2x3
690
aM 120
1100 2x800
2x20
225
08.800
2x4
690
aM 120
1400 2x800
2x20
225
08.800
2x4
690
aM 120
8.18.2
Type 2 Coordination
For Type 2 coordination, use fuses for semiconductor protection to protect the ASTAT-XT from a short circuit.
Fuses for semiconductor protection give excellent results because they have low I²t values and high interruption
ratings.
Recommended fuse selection procedure:
Fuse rated voltage: Choose minimum fuse rated voltage which is above the rated voltage of the mains.
Fuse rated current: Select a fuse which is able to carry 8 times the rated ASTAT-XT current for 30 seconds (this is
double the maximum ASTAT-XT current for the maximum acceleration time).
Fuse I²t: Verify that the I²t value of the fuse is less than or equal to the I²t value of the thyristor in the ASTAT-XT as
shown in the table below.
