65
3
Selection and application
3-6 Applications on the primary side of transformers
Table 3-15 Selecting MCCB for transformer primary circuit (Single-phase)
Single-phase, 400-440V/210-105V Transformers
Transformer capacity (kVA)
0.5
1.0
1.5
2.0
3.0
5.0
In: Rated primary current (rms A)
1.1
2.3
3.4
4.5
6.8
11.4
Irush: Exciting inrush current (rms A)
28.4
56.8
85.2
113.6
170.5
284.1
Short-circuit
current at 440V
1.5 (kA)
BW32AAG–2P003
BW32AAG–2P010
BW32AAG–2P015
BW32SAT–2P015
2.5 (kA)
BW32SAG–2P003
BW32RAG–2P010
BW32SAG–2P015
BW32SAT–2P015
7.5 (kA)
BW50SAG–2P010
BW50SAG–2P015
BW50SAT–2P015
10 (kA)
BW50RAG–2P015
BW50RAG–2P020
BW50RAG–2P030
18 (kA)
BW125JAG–2P015
30 (kA)
BW125JAG–2P015
36 (kA)
BW125RAG–2P015
50 (kA)
BW125RAG–2P015
65 (kA)
BW50HAG-2P015
Transformer capacity (kVA)
7.5
10
15
20
30
50
75
100
In: Rated primary current (rms A)
17.0
22.7
34.1
45.5
68.2
113.6
170.5
227.3
Irush: Exciting inrush current (rms A)
426.1
568.2
852.3
1136.4
1704.5
2840.9
4261.4
5681.8
Short-circuit
current at 440V
1.5 (kA)
BW32SAT–2P030
BW50SAT–2P045
BW125JAT–2P060
BW125JAT–2P090
BW250EAT–2P175
BW400EAT–2P300
BW400EAT–2P400
2.5 (kA)
BW32SAT–2P030
BW50SAT–2P045
BW125JAT–2P060
BW125JAT–2P090
BW250EAT–2P175
BW400EAT–2P300
BW400EAT–2P400
7.5 (kA)
BW50SAT–2P030
BW50SAT–2P045
BW125JAT–2P060
BW125JAT–2P090
BW250EAT–2P175
BW400EAT–2P300
BW400EAT–2P400
10 (kA)
BW50RAG–2P040
BW63RAG–2P060
BW125JAT–2P060
BW125JAT–2P090
BW250EAT–2P175
BW400EAT–2P300
BW400EAT–2P400
18 (kA)
BW125JAG–2P060
BW125JAT–2P060
BW125JAT–2P090
BW250EAT–2P175
BW400EAT–2P300
BW400EAT–2P400
30 (kA)
BW125JAG–2P060
BW125JAT–2P060
BW125JAT–2P090
BW250RAT–2P175
BW400EAT–2P300
BW400EAT–2P400
36 (kA)
BW125RAG–2P060
BW125RAG–2P075
BW125RAG–2P125
BW250RAT–2P125
BW250RAT–2P175
BW400RAT–2P300
BW400RAT–2P400
50 (kA)
BW125RAG–2P060
BW125RAG–2P075
BW125RAG–2P125
BW250RAT–2P125
BW250RAT–2P175
BW400RAT–2P300
BW400RAT–2P400
65 (kA)
BW125HAG–3P060
BW125HAG–2P075
BW125HAG–2P125
BW250HAG–2P150
BW400HAG–2P250
BW400HAG–2P400
−
−
Note: A peak inrush current of 25 times the rated current is used in the calculations.
Single-phase, 200-220V/100-115V Transformers
Transformer capacity (kVA)
0.5
1.0
1.5
2.0
3.0
5.0
In: Rated primary current (rms A)
2.3
4.5
6.8
9.1
13.6
22.7
Irush: Exciting inrush current (rms A)
56.8
113.6
170.5
227.3
340.9
568.2
Short-circuit
current at 220V
2.5 (kA)
BW32AAG-2P010
BW32AAG-2P015
BW32SAT-2P015
BW32SAT-2P020
BW32SAT-2P030
5 (kA)
BW32SAG-2P010
BW32SAG-2P015
BW32SAT-2P015
BW32SAT-2P020
BW32SAT-2P030
10 (kA)
BW50SAG-2P010
BW50SAG-2P015
BW50SAT-2P015
BW50SAT-2P020
BW50SAT-2P030
25 (kA)
BW50RAG-2P010
BW50RAG-2P015
BW50RAG-2P020
BW50RAG-2P030
BW50RAG-2P040
BW63RAG-2P060
36 (kA)
BW125JAG-2P015
BW125JAG-2P075
50 (kA)
BW125JAG-2P015
BW125JAG-2P075
85 (kA)
BW125RAG-2P015
BW125RAG-2P075
100 (kA)
BW125RAG-2P015
BW125RAG-2P075
125 (kA)
BW50HAG-2P015
BW50HAG-2P075
Transformer capacity (kVA)
7.5
10
15
20
30
50
75
100
In: Rated primary current (rms A)
34.1
45.5
68.2
90.9
136.4
227.3
340.9
454.5
Irush: Exciting inrush current (rms A)
852.3
1136.4
1704.5
2272.7
3409.1
5681.8
8522.7
11363.6
Short-circuit
current at 220V
2.5 (kA)
BW50EAT-2P045
BW100EAT-2P075
BW125JAT-2P100
BW250EAT-2P150
BW250EAT-2P200
BW400EAT-2P400
BW630RAT-3P600
−
5 (kA)
BW50EAT-2P045
BW100EAT-2P075
BW125JAT-2P100
BW250EAT-2P150
BW250EAT-2P200
BW400EAT-2P400
BW630RAT-3P600
−
10 (kA)
BW50SAT-2P045
BW100EAT-2P075
BW125JAT-2P100
BW250EAT-2P150
BW250EAT-2P200
BW400EAT-2P400
BW630RAT-3P600
−
25 (kA)
BW100EAG-2P100
BW100EAT-2P075
BW125JAT-2P100
BW250EAT-2P150
BW250EAT-2P200
BW400EAT-2P400
BW630RAT-3P600
−
36 (kA)
BW125JAT-2P060
BW125JAT-2P075
BW125JAT-2P100
BW250EAT-2P150
BW250EAT-2P200
BW400EAT-2P400
BW630RAT-3P600
−
50 (kA)
BW125JAT-2P060
BW125JAT-2P075
BW125JAT-2P100
BW250RAT-2P150
BW250RAT-2P200
BW400EAT-2P400
BW630RAT-3P600
−
85 (kA)
BW125RAG-2P125
BW250RAG-2P150
BW250RAG-2P225
BW250RAT-2P150
BW250RAT-2P200
BW400RAT-2P400
BW630RAT-3P600
−
100 (kA)
BW125RAG-2P125
BW250RAG-2P150
BW250RAG-2P225
BW250RAT-2P150
BW250RAT-2P200
BW400RAT-2P400
BW630RAT-3P600
−
125 (kA)
BW125HAG-2P125
BW250HAG-2P150
BW250HAG-2P225
BW400HAG-2P300
BW630HAG-3P500
−
−
−
Note: A peak inrush current of 25 times the rated current is used in the calculations.