3-phase + neutral line filters
FN 256
Compact general purpose
three-phase and neutral line EMC filter
Approvals
n
Three-phase and neutral line filter for
general purpose four-wire filtering
n
Compact space-saving design
n
Choice of connection style
n
Low operating leakage current
Typical applications
n
FN256filtersaredesignedspecificallyfor
applicationsinvolvingasymmetricloads,
rangingfromindustrialcontrolstomedical
electronicssystems.Thesetypicallyinvolve
insufficientlyfilteredconvertersand
switch-modepowersuppliesondifferent
phases,causingcurrentimbalanceand
significantinterferenceproblems.
n
Employingsingle-stagefiltercircuitsfor
eachphaseandtheneutralline,FN256fil-
tersprovidehighattenuationofbothsym-
metricalandasymmetricalinterference.
n
Usedasamainsinputfilter,FN256filters
alsoincreaseconductedimmunityand
thuscontributetooverallsystemreliability.
n
Choiceofconnectionstyleaswellasfilter
ratingsinlinewithcommonfusevalues
supportafastandeasyapplication-specific
filterselectionanddeployment.
n
Alightweightaluminiumhousingwitha
smallfootprintensuresthatthefilterscan
beeasilyaccommodatedoncontrolpanels
andintightpowercabinets.
n
Generalpurposefour-wirefiltering
n
High-powerofficeequipment
n
Powersupplies
n
UPS
n
Medicalapplications
n
Electricalcabinets
n
Controlpanels
Features and benefits
Technical specifications
Maximum continuous operating voltage:
3x 480/277VAC (FN 256)
3x 520/300VAC (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:
UL 94V-2 or better
Design corresponding to:
UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939
MTBF @ 50°C/400V (Mil-HB-217F):
600,000 hours
Typical electrical schematic
L1
L2
L3
Line
L
L1‘
L2‘
Load
L3‘
Cx
E
R
E
Cy
N
N‘
R1