Magnetically Compensated Multiple Chokes
DFK
Series
Nominal current:
Nominal inductance:
Rated voltage U
R
(U
max.
):
Frequency:
Test voltage:
Isolation voltage:
Climatic category:
Plastic case:
Potting resin:
0.5 - 15 A @
ϑ
a 40°C
1.5 - 20mH /tol. -30% +50%
440 VAC
50 - 400 Hz
1.8 kV/50 Hz/1min./wdg.-wdg.
2 kV eff. / wdg.-ambient
25/100/21 acc. to IEC 60068-1
UL 94 V-0
UL 94 V-0
All types of chokes correspond to the international specifications for
radio interference chokes (EN 138100).
Magnetic compensating chokes are primarily used as interference
suppression components in electronic equipment where common mode
interference is a problem. Coupled with suitable capacitors these
chokes can operate as interference protection suppression filter
systems.
The range offers a wide choice of operating voltages, rated cur-
rents inductance values etc., and are encapsulated in plastic en-
closure so that protect them against environmental factors such
as humidity, shock and vibration.
The range also includes chokes with 2 (L+ N) and 4 (3 x L + N)
inductors, which may be required for various applications. De-
pending on the case style these chokes are fitted with pins fastons
or wire leads. They are designed to operate from 230/400 VAC
mains supplies and meet the requirements of VDE 0565, T.2 and
EN 60950 norms.
These chokes may also be used in direct current applications
where magnetic compensation is required. Other ranges of high
current DKIP and high inductance DKLP types of chokes are avail-
able (page 26/28).
Application
L
N
C
C
o
C
HF
L
S
L
HF
Radio interference suppresion choke
(magnetically compensated DF)
Radio interference suppression capacitor (X)
Radio interference suppression capacitor (Y)
High Frequency capacitor
Radio interference suppression choke (magnetically saturated DFS/DFL)
High Frequency choke (UKW)
Technical Data
Type
DFK2-17.5-0.5-10/a
DFK2-20-1.0-10/a
DFK2-20-1-20/a
DFK2-25-1.0-10/a
DFK2-25.2.0-10/a
DFK2-33-2-20/a
DFK2-33-3.0-10/a
DFK2-40-6.0-4/a
DFK2-40-15-1/a
DFK4-48-6-1.5/a
I
N
(1)
[A]
L
N
(2)
[mH]
R
cu
(3)
[mΩ]
[kHz]
∼
f
Res
Dimensions
A x D x H [mm]
Case
03
07
07
11
12
20
20
25-2
25-2
29-4
0.5
1.0
1
1.0
2.0
2
3.0
6.0
15
6
2
2
2
2
2
2
2
2
2
4
x
x
x
x
x
10
10
20
10
10
2
2
2
2
2
2
2
2
2
4
x
x
x
x
x
900
500
500
510
250
500
700
500
500
500
300
380
400
1450
200
17.5 x 16.5 x 10
20 x 20 x 15
20 x 20 x 15
25 x 25 x 15
25 x 25 x 20
33
33
40
40
48
x
x
x
x
x
33
33
40
40
48
x
x
x
x
x
15
15
31
31
30
x 20
x 10
x 4
x 1
x 1.5
x 250
x 150
x 27
x 10
x 20
(1)
@
ϑa
40°C; current derating over 40°C: I = I
N
x
(100-ϑa)/60
(2)
Nominal inductance measured according to EN 138100, see introduction of this catalog, paragraph 3.4
(3)
Resistance @
ϑa
25°C
22
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