DATASHEET
3-Phase + Neutral Line Filters FN 3256
Compact Line Filter for Industrial Machinery/Equipment
Compact, space-saving design, optimized for
industrial machinery
Approvals
Combines high attenuation performance with
low leakage current
Performance according to the machine tool
standard EN 50370-1
Increases also the immunity if operated directly
on the mains input
Features and benefits
An extremely compact and light weight filter design
with a „cubic“ shape, requiring minimum mounting
space and thus taking the constructional conditions
on the mains input of machinery into account
Simple and time-saving installation with good
accessibility for automatic and hand tools
Solid, touch-safe terminal blocks offering sufficient
contacting cross section according to the EN 60204-
1 installation standard, which is very common in
industrial applications
As a mains input filter for three phases and neutral
line, FN 3256 ensures the compliance with the new
product family standard for machine tools in mainly
industrial environments EN 50370-1. Further, its use
will also increase the conducted immunity of the
entire installation significantly
FN 3256 provides the attenuation performance to
meet the requirements of various machine tools
with up to 8 driving axes with ~10 m of motor cable
each
For easy selection and application, the filter current
ratings are aligned with common fuse values
3x 520/300 VAC (480 VAC +10% possible)
dc to 60 Hz
8 to 160 A @ 50 °C
P –> E 3000 VDC for 2 sec
Technical specifications
Maximum continuous operating voltage
Operating frequency
Rated currents
High potential test voltage
Protection category
Overload capability
Typical applications
P –> P 2250 VDC for 2 sec
IP20
Temperature range (operation and storage)
Flammability corresponding to
Design corresponding to
4x rated current at switch on,
1.5x rated current for 1 minute, once per hour
-25 °C to +100 °C (25/100/21)
UL 94 V-2 or better
UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939
>410,000 hours
MTBF @ 50°C/400V (Mil-HB-217F)
Mainly industrial equipment, machinery, machine
tools and diverse process auto- mation systems with
three-phase and neutral electricity supply. Further,
these filters are suitable for power supplies, high-
power office equipment and further applications,
where efficient interference suppression on three
phases and the neutral line is required and where
space is critical. Because of the very low leakage
current, FN 3256 can even be used for some medical
devices.
Typical electrical schematic
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