Series M, CL, CK
Contactors for connection of power transformers
In this application it is essential to ascertain the no-load
inrush current of the transformer Iμ, (magnetisation
current) which in the majority of cases determines the size
of the contactor.
Motorstarters
Two cases are illustrated in the table:
– No-loap inrush current up to 20 times the rated
transformer current
– No-loap inrush current up to 40 times the rated
transformer current.
A
B
C
D
E
F
G
H
I
X
D.62
Selection table
Iμ
Iμ
= 20
Ie
= 40
Contactor
Ie
230V
240V
kVA
380V
400V
kVA
2
2.75
4
5.75
5.75
7.25
9
10
12
15
20
25
30
35
40
45
50
80
100
127
160
3.5
5
7
10
10
12.5
15.5
17
21
25
35
40
50
55
60
75
85
150
170
215
280
230V
240V
kVA
1
1.37
2
2.85
2.85
3.65
4.50
5
6
7.5
10
12.5
15
17
20
22
25
40
50
64
80
380V
400V
kVA
1.75
2.5
3.5
5
5
6.25
7.75
8.5
10.5
12.5
16
20
25
27
30
35
42.5
75
85
107
140
CL00A
CL01A
CL02A
CL25A
CL03A
CL04A
CL45A
CL05A
CL06A
CL07A
CL08A
CL09A
CL10A
CK75C
CK08C
CK85B
CK09B
CK10C
CK11C
CK12B
CK13B
The contactor should not cut out the short-circuit current; if
the protective devices used are fuses, this condition will be
intrinsically complied with.
In the case however of devices with tripping contacts the
general line circuit breaker will be driven rather than the
contactor coil.