Short Circuit Protection; Type 1 Coordination; Type 1 Coordination With Ge Circuit Breakers; Type 1 Coordination With Type Am Siba Fuses - GE ASTAT XT QT 0008U Series User Manual

8.18 Short Circuit Protection

Type 1 Coordination

8.18.1
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:

Soft Starter
Rated Current
A
8
17
31
44
58
72
85
105
145
170
210
310
390
460
580
650
820
950
1100
1400

8.18.1.2 Type 1 Coordination with Type aM Siba Fuses:

Soft Starter
Rated Current
A
8
17
31
44
58
72
85
105
145
170
210
310
390
460
580
650
820
950
1100
1400

Type 2 Coordination

8.18.2
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.
• Application diagrams
72
GE Circuit Breaker
O/L
A Frame Type
16 FD63
40 FD63
50 FD63
63 FD160
80 FD160
80 FE160
125 FE160
160 FE160
160 FE160
250 FE250
250 FE250
400 FG630
400 FG400
630 FG630
630 FG630
800 FK800
1250 FK1250
1250 FK1250
1250 FK1250
1600 FK1600
SIBA aM Fuses
Rated
Current
A P/No.
16 20 477 08.16
20 20 477 08.20
35 20 477 08.35
50 20 477 08.50
80 20 209 08.80
100 20 209 08.100
125 20 209 08.125
160 20 210 08.160
200 20 211 08.200
200 20 211 08.200
250 20 211 08.250
400 20 212 08.400
500 20 213 08.500
630 20 213 08.630
800 20 225 08.800
800 20 225 08.800
1000 20 225 08.1000
2x630 2x20 213 08.630
2x800 2x20 225 08.800
2x800 2x20 225 08.800
Breaking Capacity
O/L Type
LTMD 16
LTMD 40
LTMD 50
LTMD 63
LTMD 80
LTMD 80
SMR1-125
SMR1-160
LTMD 160
LTMD 250
LTMD 250
SMR1-400
SMR1-400
SMR1-630
SMR1-630
SMR1s-800
SMR1s-1250
SMR1s-1250
SMR1s-1250
SMR1s-1600
Size Un Type
000 690 aM
000 690 aM
000 690 aM
00 690 aM
00 690 aM
00 690 aM
00 690 aM
0 690 aM
1 690 aM
1 690 aM
1 690 aM
2 690 aM
3 690 aM
3 690 aM
4 690 aM
4 690 aM
4 690 aM
2x3 690 aM
2x4 690 aM
2x4 690 aM
KA
65
65
65
65
65
65
65
65
65
65
65
65
65
65
65
50
50
50
50
50
Breaking
Capacity
KA
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120