Ground Wire Chokes (earth line chokes)
DE (DEH, DEN, DENO)
Series
Nominal current:
Nominal inductance:
Application range:
Isolation voltage:
Climatic category:
Plastic case:
Potting resin:
2 kV eff. / wdg. ambient
25/100/21 acc. to IEC 60068-1
UL 94 V-0
UL 94 V-0
16 - 25 A @
ϑ
a 40°C
0.02 - 4 mH
DEN f
Res
≥
300 kHz
DEH f
Res
≥
20 MHz
All types of chokes correspond to the international specifications
for radio interference chokes (EN 138100).
The most important conditions:
Wire cross section
of ground wire choke
Conductor cross section
Voltage drop across choke
≥
≥
≤
wire cross section earthed
conductor of equipment
1 mm
2
at 16 A
1.5 mm
2
at 20 A
4 V a.c. at 4 x I
Nom.
Ground wire chokes for HF (high frequency) or LF (low frequency)
purposes are often used in the radio interference suppression field
as an additional interference suppression element to interference
suppression chokes and interference suppression capacitors.
These types of chokes permit the building of a system free of
ground wire loops. Ground wire chokes can only be put on the
market if they meet the relevant specifications (e.g. VDE and SEV).
Technical Data
Type
Conductor I
N
(1)
Cross-section [A]
[mm
2
]
L
N
(2)
[mH]
R
cu
(3)
∼
f
Res
[mΩ] [MHz]
Mechanical dimensions
DEN1-25-16-4/a
DEHL1-10-16-20/a
DEH2.5-15-25-40/a
DEN1-25-16-4/a
DENO1-23-16-2/a
DENO1-25-16-4/a
(1)
1
2.5
1
1
1
16
25
16
16
16
0.02
±15%
0.04
±15%
4.00
−30%
+50%
2.00
−30%
+50%
4.00
−30%
+50%
15
10
27
15
27
30
20
0.3
0.3
0.3
@
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
Mechanical dimensions
Application:
DEN/DEH earth line chokes are very often used, if within the sys-
tems, earth conductor loops are to be taken into consideration.
(Interconnection of several peripheral apparatus with a computer
on locally installed wall sockets).
Errors in the system caused by earth conductor loops are to be
found in the LF-field as well as in the HF-field. In many cases the
error can be eliminated by separating the mains earth line, using
an earth line choke.
Type
DEHL 1-10-16-20/a
DEH 2.5-15-25-40/a
[mm]
A
[mm]
B
[mm]
C
[mm]
D
60
80
35
60
H
10
10
12
17
Mechanical dimensions
D
∅
d
Type
DENO 1-23-16-2/a
DENO 1-25-16-4/a
[mm]
D
L
[mm]
H
[mm]
d
[mm]
L
25
25
18
18
1.12
1.12
30
30
Example of a perfect earth line system using a radiator and an
earth line choke.
32
PCB Design
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