.31..30.
13.2 Selective protection in NA1
Circuit breaker
Rated
current (A)
Default setting ratings
of short time-delay 8In (kA)
Setting
range (kA)
Delayed tripping
time (s)
Returnable time
Frame size
rated current
Rated
current (A)
400 630 1000 1250 1600 2000 2000 2500
3200
3200
NA1-2000
NA1-3200
NA1-4000
NA1-6300
4000
4000
5000
6300
NA1-2000 NA1-3200 NA1-4000 NA1-6300
3.2
0.4~6
5.04
0.63～9.45
8
1~15
10 16
16 20
25.6
25.6 32 32
1.25~18.75
2~30 2~30 2.5~37.7 3.2~48 3.2~48 4~60 4~60
40
50.4
5~75 6.3~94.5
Default instantaneous
setting ratings 12In (kA)
400
630
800
1000
1250
1600
2000
2000
2500
3200
3200
4000
4000
5000
6300
4.8
7.56
9.6
12
15
19.2
24
24
30
38.4
38.4
48
48
60
75
6.348~9.45
800
6.4
0.8~12
6.348~12
9.998~12
6.348~15
9.998~15
12.696~15
6.348~18.75
9.998~18.75
12.696~18.75
15.87~18.75
6.348~24
9.998~24
12.696~24
15.87~24
19.837~24
6.348~30
9.998~30
12.696~30
15.87~30
19.837~30
25.392~30
6.348~30
9.998~30
12.696~30
15.87~30
19.837~30
25.392~30
6.348~37.7
9.998~37.7
12.696~37.7
15.87~37.7
19.837~37.7
25.392~37.7
31.74~37.7
31.74~37.7
6.348~48
9.998~48
12.696~48
15.87~48
19.837~48
25.392~48
31.74~48
31.74~48
39.675~48
6.348~48
9.998~48
12.696~48
15.87~48
19.837~48
25.392~48
31.74~48
31.74~48
39.675~48
6.348~60
9.998~60
12.696~60
15.87~60
19.837~60
25.392~60
31.74~60
31.74~60
39.675~60
50.784~60
50.784~60
6.348~60
9.998~60
12.696~60
15.87~60
19.837~60
25.392~60
31.74~60
31.74~60
39.675~60
50.784~60
50.784~60
6.348~75
9.998~75
12.696~75
15.87~75
19.837~75
25.392~75
31.74~75
31.74~75
39.675~75
50.784~75
50.784~75
63.48~75
63.48~75
6.348~94.5
9.998~94.5
12.696~94.5
15.87~94.5
19.837~94.5
25.392~94.5
31.74~94.5
31.74~94.5
39.675~94.5
50.784~94.5
50.784~94.5
63.48~94.5
63.48~94.5
79.35~94.5
Note: It can satisfy the selective protection if only the short time-delay setting value of the superior breaker 1.32 times more than the subordinate breaker,
when the instantaneous setting value is adjustive.
Downstream
Upstream
0.1, 0.2, 0.3, 0.4 0.1, 0.2, 0.3, 0.4
0.06, 0.14, 0.23, 0.35
0.06, 0.14, 0.23, 0.35
Air Circuit Breaker
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