1-line filters
Feedthrough components
General
Feedthrough components from EPCOS are used for EMI suppression of all electrical installations
and equipment. This new type series is also outstandingly well suited for telephone exchanges and
base stations. Thanks to broadband EMI suppression up to the GHz range, it prevents external in
terference pulses being transmitted to the inside of the equipment via the supply network and vice
versa.
The essential features of this new type series are its modular design and the solder-free contacting
technology developed by EPCOS with the aid of mesh contact.
Mesh contact technology permits uniform concentric contacting of the MKP capacitor winding and
avoids the thermal stress associated with soldering. The result is an even higher insertion loss, a
high insulation resistance and a particularly compact case.
The modular system used in this new technology for feedthrough capacitors and filters allows the
cost-effective implementation of a wide range of standard types. Other capacitance values can also
be supplied for special applications upon request.
Feedthrough components fitted
into a shielding wall.
In feedthrough capacitors, the conductor carrying the operating current is connected concentrically
to one electrode and is run centrally through the capacitor. The other electrode is contacted con
centrically to the capacitor case.
Feedthrough capacitors are dimensioned so that they perform well from low frequencies to far above
300 MHz. The capacitor element with low inductance contacted securely on the face side is
incorporated in a metal case provided with a screw thread.
The feedthrough filters are constructed in a
π-circuit.
They consist of two identical capacitative
transverse elements and an inductive longitudinal element. The concentric layout of the compon
ents allows high insertion loss values to be attained in a frequency range to above 1 GHz.
Safety note
Feedthrough components with high capacitances require the implementation of safety measures in
line with the applicable specifications! (See also Chapter “Mounting instructions”.)
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
01/06
1-line filters
Feedthrough components
Mounting instructions
To fully utilize their RF properties, the feedthrough components must be mounted directly into shiel
ding walls. The case must be contacted seamlessly (sealed against RF signals) to the shielding
wall. This can be best done by screwing it into a threaded hole or bushing so that contact is made
via the threads.
Alternatively, the feedthrough components may be screwed into feed-through holes on the shielding
wall by means of attachment nuts. The contact between case and the shielding wall is then set up
via the contact surface of the thread.
Caution
Contacts with rigid copper busbars are not permitted in view of mechanical stresses of the
bushings due to impacts and vibrations.
For types with screw connections, the connecting cable must be secured between two nuts
to exclude a torque on the feedthrough pins. The use of two flat wrenches is recommended.
Recommended tightening torques for feedthrough components (capacitors, filters)
Thread
dimensions
M2
M3
M4
M5
M6
M8
M10
M12
M16
M18
M10
×
0.75
M12
×
0.75
M20
×
1
M24
×
1.5
M27
×
1.5
M32
×
1.5
Tightening
torque (Nm)
0.2
0.6
1.2
2
3
5
8
12
28
35
3
4
10
12
16
24
Tolerance (Nm)
+0.05
+0.1
+0.1
+0.5
+0.5
+0.5
+2
+2
+2
+2
+0.5
+0.5
+1
+1.5
+2
+2.5
Terminal
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Thread base
attachment
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
01/06
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