3-phase lters
FN 351
General purpose EMC lter
for three-phase applications
Approvals
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EMC solution for industrial inverters and
motor drives
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Rated currents from 8 to 280A
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Selectable voltage level of 440V and 520V
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High differential and common-mode
attenuation
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Compliant with IEC 60950
FN 351H up to 110A
FN 351 up to 110A
Typical applications
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Broad range of power ratings for fast and
convenient filter selection.
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Available as 440VAC (FN 351) and 520VAC
(FN 351H) versions for network-specific
applications.
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FN 351 filters provide a broadband
common and differential-mode attenuation
performance, which remains available also
when high interference levels are present.
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Solid, touch-safe filter terminals contribute
to overall equipment safety and make the
filters compliant with IEC 60950.
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Introduced as one of the very first motor
drive EMC filters in the market, FN 351
has been widely imitated and has success-
fully proven its function over more than
10 years.
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Three-phase motor drives
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Inverters and converters
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Industrial automation equipment
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UPS
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SMPS
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General purpose three-phase filtering
Features and benefits
Technical specifications
Maximum continuous operating voltage:
3x 440/250VAC (FN 351)
3x 520/300VAC (FN 351H)
Operating frequency:
dc to 60Hz
Rated currents:
8 to 280A @ 40°C
High potential test voltage:
P –> E 2600VDC for 2 sec (FN 351)
P –> P 1900VDC for 2 sec (FN 351)
P –> E 2750VDC for 2 sec (FN 351H)
P –> P 2250VDC for 2 sec (FN 351H)
Protection category:
IP20
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 +85°C (25/085/21) (FN 351)
-25°C to +100°C (25/100/21) (FN 351H)
Flammability corresponding to:
UL 94V-2 or better
Design corresponding to:
UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939
MTBF @ 40°C/400V (Mil-HB-217F):
135,000 hours
Typical electrical schematic
L1
L2
L3
Line
L
Cy
L1‘
L2‘
Load
L3‘
Cx
E
R
E
Cx
Cy