75
74
Selective protection
Selective protection table
Note:
1)
No content means no selectivity.
2)
1000 means local selectivity, the number refers to the maximum fault current to achieve selective protection. If selective protection can be
achieve below 1000A, the upstream and downstream circuit breakers above 1000A may operate at the same time.
3)
T means the complete selectivity can be achieved within the breaking capacity range of downstream circuit breaker.
Curves and Parameters
Curves and Parameters
Upstream circuit
breaker
Downstream
circuit breaker
EX9M1
Ex9M2
Ex9M2
SU20
Ex9M3
Ex9M3
SU20
Ex9M4
Ex9M4
SU20
Ex9M5
Ex9M5
SU20
Ex9M6
Ex9M6
electronic type
In (A)
16
20
25
32
40
50
63
80
100
125
160
125
160
180
200
225
250
32
63
100
160
250
250
315
350
400
500
250
400
630
400
500
630
800
630
700
800
800
800
1000
1250
1600 800
1000
1250
1600
Ex9B
release type:B/C
≤10
190
190
300
400
500
500
500
630
800
1000
1250
T
T
T
T
T
T
400
500
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
16
300
400
500
500
500
630
800
1000
1250
T
T
T
T
T
T
400
500
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
20
500
500
500
630
800
1000
1250
T
T
T
T
T
T
500
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
25
500
500
630
800
1000
1250
T
T
T
T
T
T
500
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
32
500
630
800
1000
1250 2000
5000 T
T
T
T
500
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
40
630
800
1000
1250 2000
5000 T
T
T
T
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
50
800
1000
1250 2000
5000 T
T
T
T
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
63
1000
1250 2000
5000 T
T
T
T
1000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Ex9M1
16
400
500
500
630
800
1000
1250
1000
2500 2500 2500 2500 2800
500
1000
2500 2800
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
20
500
500
630
800
1000
1250
1000
2500 2500 2500 2500 2800
500
1000
2500 2800
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
25
500
630
800
1000
1250
1000
2500 2500 2500 2500 2800
500
1000
2500 2800
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
32
630
800
1000
1250
1000
2500 2500 2500 2500 2800
1000
2500 2800
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
40
800
1000
1250
1000
2000 2000 2500 2500 2800
1000
2000 2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
50
1000
1250
1000
2000 2000 2500 2500 2800
1000
2000 2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
63
1250
1000
2000 2000 2500 2500 2800
2000 2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
80
2000 2000 2500 2500 2800
2000 2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
100
2500 2500 2800
2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
125
2500 2800
2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
160
2500 2800
2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Ex9M2
125
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
160
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
180
3500
4000 5000 T
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
200
4000 5000 T
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
225
5000 T
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
250
5000 T
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Ex9M2
electronic type
32
1000
2000 2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
63
2000 2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
100
2800
2800 3500
4000 5000 T
2800
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
160
4000 5000 T
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
250
5000 T
5000 T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Ex9M3
250
5000 6000
9500 9500 9500 9500 9500
9500 9500 9500 9500
9500
12000
15000 19000 9500
12000
15000 19000
315
6000
9500
9500 9500 9500
9500 9500 9500 9500
9500
12000
15000 19000 9500
12000
15000 19000
350
9500
9500 9500
9500 9500 9500 9500
9500
12000
15000 19000 9500
12000
15000 19000
400
9500
9500 9500 9500 9500
9500
12000
15000 19000 9500
12000
15000 19000
500
9500
9500 9500 9500 9500
9500 9500
1250
1600 9500 9500
1250
1600
Ex9M3
电子式
250
5000 6000
5000 9500 9500 9500 9500 9500
9500 9500 9500 9500
9500
12000
15000 19000 9500
12000
15000 19000
400
9500
9500 9500 9500 9500
9500
12000
15000 19000 9500
12000
15000 19000
630
9500
1250
1600
9500
1250
1600