59 / 78
TECHNI CAL DATA
POL ESTAR COMPACT
59
POLESTAR COMPACT MCBs – Type B, C & D typical tripping times/I
2
t energy let-through values
l
CHARACTERISTIC: B & C
l
10
6
2
3
4
5
6
7
8
9
10
5
2
3
4
5
6
7
8
9
10
4
2
3
4
5
6
7
8
9
10
3
2
3
4
5
6
7
8
9
10
2
10
1
2
3
4
5
6
7
8
9
2 3 4 5 6 7 89
10
1
10
2
2 3 4 5 6 7 89
10
3
2 3 4 5 6 7 89
10
4
2 3 4 5 6 7 89
10
5
B/C 20/32/40
B/C 50/63
B/C 16
B/C 10
B/C 6
Prospective short circuit current Ip
(A)
Energy let-through current
(A
2
s)
CHARACTERISTIC: D
l
10
6
10
3
10
2
2
3
4
5
6
7
8
9
2 3 4 5 6 7 89
10
1
10
2
2 3 4 5 6 7 89
10
3
2 3 4 5 6 7 89
10
4
2 3 4 5 6 7 89
10
5
Prospective short circuit current Ip
(A)
Energy let-through current
(A
2
s)
10
4
2
3
4
5
6
7
8
9
10
5
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
D32
D40/50/63
D20
D16
D10
D6
TRANSFORMERS
l
Transformers produce inrush currents when they are switched on, typically 15
times the normal running current.
The tables below show the recommended MCB rating for single phase (230V)
and 3 phase (400V) transformers.
SINGLE PHASE 230V AC SUPPLY
TRANSFORMER MCB RATING (A)
RATING (VA) Type B Type C Type D
50 6 6 6
100 6 6 6
200 6 6 6
300 10 6 6
400 10 6 6
500 16 10 6
750 16 10 6
1000 32 16 10
2500 63 32 16
5000 – 63 32
7500 – – 50
10000 – – 63
THREE PHASE 400V AC SUPPLY
TRANSFORMER MCB RATING (A)
RATING (VA) Type B Type C Type D
500 6 6 6
750 6 6 6
1000 10 6 6
2000 16 10 6
3000 32 16 10
4000 32 20 10
5000 40 32 16
7500 63 32 16
10000 – 50 32
15000 – 63 32
20000 – – 50
25000 – – 63
30000 – – 63
The above information applies to MCBs supplying transformers irrespective of
the load on the secondary circuit. If the MCBs are on the secondary side of
the transformer, they do not see the inrush current and so nuisance tripping
does not occur.