EMC filters
1-line filters
Feedthrough filters
Rated current 16 to 500 A
Series/Type: B85321
Date: January 2006
EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet and the
information contained therein without EPCOS’ prior express consent is prohibited.
1-line filters
Feedthrough components
Overview of available types
Type Dia-
meter
mm
Feedthrough filters
B85321A*+160 16
B85321A*+160 20
B85321A*A250
30
B85321A*A750
B85321A*A630,
55
A101 … A501
Insertion loss in the
frequeny range (Hz)
7
New
Rated current
(A)
Rated voltage
(VAC)
Rated
capacitance
105 106 10
(µF)
Terminal type
● 16 250 2 × 0.0025 6
● 25 250,
2 × 0.0025 8
500
● 25,
● 63 …
250 2 × 0.1 …
75
250 2 × 0.5 …
500
2 × 1.0
10
11
2 × 4.7
Page
5
Legend
Terminal type: Tab connectors
Axial leads
Soldering tags
Threaded studs
Please read Cautions and warnings and
Important notes at the end of this document.
01/06 2
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 interference pulses being transmitted to the inside of the equipment via the supply network and viceversa.
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 concentrically 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 components 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.
01/06 3
1-line filters
Feedthrough components
Mounting instructions
To fully utilize their RF properties, the feedthrough components must be mounted directly into shielding 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
Tightening
torque (Nm)
Tolerance (Nm) Terminal Thread base
attachment
M2 0.2 +0.05 ×
M3 0.6 +0.1 ×
M4 1.2 +0.1 ×
M5 2 +0.5 ×
M6 3 +0.5 ×
M8 5 +0.5 ×
M10 8 +2 ×
M12 12 +2 ×
M16 28 +2 ×
M18 35 +2 ×
M10 × 0.75 3 +0.5 ×
M12 × 0.75 4 +0.5 ×
M20 × 1 0 +1 ×
1
M24 × 1.5 12 +1.5 ×
M27 × 1.5 16 +2 ×
M32 × 1.5 24 +2.5 ×
Please read Cautions and warnings and
Important notes at the end of this document.
01/06 4
1-line filters B85321
Feedthrough filters
Rated voltage 250 V AC
Rated current 16 to 500 A
Rated capacitance 2 × 0.0025 to 2 × 4.7 µF
Construction
■ Building-block system
■ MKP technology (dry, self-healing)
Dielectric: polypropylene, metallized
■ Metal case, polyurethane potting (UL 94 V-0)
■ For central screw fixing
Features
■ Compact dimensions
■ Versions with rated voltage 440 V AC available on request
■ High insertion loss
■ Easy to install
■ High contact reliability thanks to central screw fixing
■ Comply with EN 133200
■ UL approval
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
■ Axial leads
■ Soldering tag
■ Tab connector
Marking
Manufacturer, ordering code, rated capacitance,
rated voltage, rated current, climatic category,
circuit diagram, date of manufacture (MM.YY), approvals
Circuit diagram
SSB1274-B
Please read Cautions and warnings and
Important notes at the end of this document.
01/06 5
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