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Three-phase + neutral line filter for
general purpose four-wire filtering
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Compact space-saving design
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Choice of connection style
■
Low operating leakage current
3-phase + neutral line filters
FN 256
Compact general purpose
3-phase + neutral EMC filter
Technical specifications
Maximum continuous operating voltage:
3x 480VAC (FN 256)
3x 520VAC (FN 256 -H)
Operating frequency:
dc to 60Hz
Rated currents:
8 to 160A @ 50°C
High potential test voltage:
P –> E 2650VDC for 2 sec (FN 256)
P –> P 2100VDC for 2 sec (FN 256)
P –> E 3000VDC for 2 sec (FN 256 -H)
P –> P 2250VDC for 2 sec (FN 256 -H)
Protection category:
IP20
IP00 (filters with connectors -28)
Overload capability:
4x rated current at switch on,
1.5x rated current for 1 minute, once per hour
Temperature range (operation and storage):
-25°C to +100°C (25/100/21)
Flammability corresponding to:
UL94V-2 or better
Design corresponding to:
UL1283, CSA22.2 No. 8 1986, EN133‘200
MTBF @ 50°C/400V (Mil-HB-217F):
600,000 hours
Typical electrical schematic
Features and benefits
Typical applications
■ General purpose 4-wire filtering
■ High power office equipment
■ Power supplies
■ UPS
■ Medical applications
■ Electrical cabinets
■ Control panels
■ FN 256 filters are designed specifically for
applications involving asymmetric loads,
ranging from industrial controls to medical
electronics systems. These typically
involve insufficiently filtered converters
and switch-mode power supplies on dif-
ferent phases, causing current imbalance
and significant interference problems.
■ Employing single-stage filter circuits for
each phase and the neutral line, FN 256 fil-
ters provide high attenuation of both sym-
metrical and asymmetrical interference.
■ Used as a mains input filter, FN 256 filters
also increase conducted immunity and
thus contribute to overall system
reliability.
■ Choice of connection style as well as filter
ratings in line with common fuse values
support a fast and easy application-specific
filter selection and deployment.
■ A lightweight aluminium housing with a
small footprint ensures that the filters can
be easily accommodated on control panels
and in tight power cabinets.
Approvals
By December 2005