EMC Components
Feed-Through Capacitors
Feed-Through Filters
in Solderless MKP Technology
Data Sheet
Feed-Through Capacitors
Feed-Through Filters
1
General
B85121
B85321
MeshContact is a solderless technology newly developed by Siemens Matsushita Components. It
allows uniform concentric contacting of MKP capacitor winds, avoiding the thermal stress caused
by soldering. The result is even better insertion loss, high insulation resistance plus compact, small
casing.
Basically, feed-through components can be used to suppress interference in all electrical installa-
tions and equipment. The new series is also ideal for telephone switching systems and base sta-
tions and, through broadband suppression effective into the GHz region, prevents interference puls-
es from entering equipment from outside through the power supply network and vice versa.
There is now a building-block system available in this new technology for feed-through capacitors
and filters, allowing fast and attractively priced solutions to be implemented. Interim ratings can be
produced to order for special applications.
Feed-through elements fitted into a shielding wall
Selector guide
Diameter
30 mm
55 mm
Voltage range
up to 75 A
up to 500 A
Capacitance range
0,1 … 1
µ
F
0,5 … 4,7
µ
F
3
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Feed-Through Capacitors
Feed-Through Filters
B85121
B85321
In feed-through capacitors the conductor carrying the load current is connected concentrically to
one electrode and passes through the center of the capacitor. The other electrode makes concentric
contact with the capacitor case.
Feed-through capacitors are designed to be effective from low frequency to far above 300 MHz. The
low-loss winding with high-stability contact to the leads at its face ends is enclosed in a metal case
with either a threaded stud at one end or an external thread.
Feed-through filters have
π
filter circuits consisting of two equal shunt capacitors and one ferro-
magnetic inductor connected in series. Due to the concentric arrangement of the components, high
attenuation values are obtained for frequencies up to and exceeding 1 GHz.
Safety note!
If feed-through elements with high capacitances are used, protective measures (e.g. protective
earthing) in accordance with equipment/system regulations (product standards) are required!
2
Mounting instructions
To fully utilize their RF characteristics, feed-through components must be fitted directly into the
shielding wall. The component case must make perfect and unbroken (RF-tight!) contact with the
shielding. This can be best achieved by screwing them into a threaded hole or bushing, so that good
electrical contact is made by the flanks of the thread.
As an alternative, feed-through elements can be screwed into feed-through holes in a shielding wall
and held by a retaining nut. Contact between the case and the shielding wall is produced by the
contact surface on the thread.
The connecting line must be attached by fixing it between two countered nuts in order to avoid ex-
posing the component to torque loads (use two spanners).
NOTE
Due to the danger of exposing the feed throughs to mechanical loads caused by shock and
vibration, it is not permissible to use rigid copper bars as connecting elements.
4
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Feed-Through Capacitors
Feed-Through Filters
Construction
■
Building-block system
■
MKP technology (dry, self-healing)
B85121
B85321
Dielectric: polypropylene, metallized
■
Metal case with synthetic resin terminals
■
For central screw fixing
Features
■
Compact dimensions
■
Variable current rating and capacitance
through building-block system
■
High attenuation
■
Simple fitting
■
High contact reliability through
central screw fixing
Applications
Broadband interference suppression
for ac/dc supply lines, e.g. in
■
shielded rooms
■
telephone exchanges, base stations
■
electrical machines and systems
■
power supplies
Terminals
■
Threaded studs
Marking
Manufacturer, ordering code, EMI suppression class,
rated capacitance, rated voltage, rated current,
climatic category, circuit diagram, date of manufacture (MM.YY)
Standards
Feed-through capacitors comply with EN 133 200
Feed-through filters comply with EN 133 400
Safety information
Due to the high capacitance ratings protective measures (e.g. protective earthing)
in accordance with equipment/system regulations are required.
Circuit diagrams
SSB1274-B
SSB1275-J
Feed-through filters
5
Feed-through capacitors
05/00
Feed-Through Capacitors
B85121
Feed-through capacitors
∅
30 mm
I
R
A
25
C
R
µ
F
0,1
0,5
1,0
75
0,1
0,5
1,0
V
R
Vac
250
250
250
250
250
250
V
P
Vdc
3000
2500
2000
3000
2500
2000
Ter-
minal
M6
M6
M6
M6
M6
M6
Dimensions (mm)
∅×
l
l
1
Ordering code
B85121-A2104-A250
B85121-A2504-A250
B85121-A2105-A250
B85121-A2104-A750
B85121-A2504-A750
B85121-A2105-A750
Vdc
600
600
600
600
600
600
∅
30
×
55
∅
30
×
55
∅
30
×
55
∅
30
×
55
∅
30
×
55
∅
30
×
55
110
110
110
110
110
110
Insertion loss (dB); typical values at 50
Ω
Capacitance
C
R
0,1
µ
F
0,5
µ
F
1,0
µ
F
10 kHz
0
2
5
100 kHz
5
15
25
1 MHz
20
35
45
10 MHz
40
40
50
100 MHz
60
80
85
1 GHz
>
70
> 90
> 90
General technical data
Capacitance tolerance:
IEC climatic category:
Screw cap fixing:
Dimensional drawing
Marking
±
20 %
40/085/56 (– 40
°
C/+ 85
°
C, 56 days damp heat test)
standard M20
×
1
M20x1
5
l
1
l
SSB1271-L
6
05/00
ø30
M6
M6
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