3-phase + neutral line filters
FN 256
Compact general purpose
three-phase and neutral line EMC filter
n
n
n
n
Three-phase and neutral line filter for
general purpose four-wire filtering
Compact space-saving design
Choice of connection style
Low operating leakage current
Approvals
Technical specifications
Maximum continuous operating voltage:
Operating frequency:
Rated currents:
High potential test voltage:
Protection category:
Overload capability:
Temperature range (operation and storage):
Flammability corresponding to:
Design corresponding to:
MTBF @ 50°C/400V (Mil-HB-217F):
3x 480/277VAC
dc to 60Hz
8 to 160A @ 50°C
P –> E 2650VDC for 2 sec
P –> P 2100VDC for 2 sec
IP20
IP00 (filters with connectors -28)
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 94V-2 or better
UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939
600,000 hours
Typical electrical schematic
L
L1
L2
L3
Cx
N
Cy
E
Line
Load
R1
E
R
N‘
L1‘
L2‘
L3‘
Features and benefits
n
Typical applications
n
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 different
phases, causing current imbalance and
significant interference problems.
Used as a mains input filter, FN 256 filters
also increase conducted immunity and
thus contribute to overall system reliability.
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n
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n
n
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n
General purpose four-wire filtering
High-power office equipment
Power supplies
UPS
Medical applications
Electrical cabinets
Control panels
n
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.
n
A light weight aluminium housing with a
small footprint ensures that the filters can
be easily accommodated on control panels
and in tight power cabinets.
n
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.
> Components
> FN 256
Filter selection table
Filter*
Rated current
@ 50°C (40°C)
[A]
8 (8.8)
16 (17.5)
25 (27)
36 (39)
64 (70)
80 (88)
120 (131)
160 (175)
Leakage current**
@ 400VAC/50Hz
[mA]
3.4
3.4
3.4
3.4
3.4
3.4
5.0
6.8
Power loss
@ 25°C/50Hz
[W]
2.7
6.0
11.6
14.8
18.4
18.8
25.1
30.7
Input/Output
connections
Weight
FN
FN
FN
FN
FN
FN
FN
FN
*
**
256-8-46
256-16-46
256-25-47
256-36-47
256-64-52
256-80-..
256-120-..
256-160-..
-46
-46
-47
-47
-52
-28***
-28***
-28***
-34
-35
-40
[kg]
0.8
1.1
1.4
1.5
2.2
4.5
6.1
8.0
To compile a complete part number, please replace the -.. with the required I/O connection style.
Maximum leakage under normal operating conditions, based on the assumption that all three phases and the neutral conductor are connected to the supply and the consumer. In this case, the
current will mainly return through the neutral line, not as earth leakage.
*** Filters with -28 connections are rated for 40°C environmental temperature only.
Typical filter attenuation
Per CISPR 17; A = 50Ω/50Ω sym; B = 50Ω/50Ω asym; C = 0.1Ω/100Ω sym; D = 100Ω/0.1Ω sym
8A types
16A types
25A types
36A types
64A types
80A types
120A types
160A types
> Components
> FN 256
Mechanical data
8 to 64A types
80 to 160A types (-28)
80 to 160A types (-34, -35, -40)
Dimensions
8A
16A
25A
36A
64A
80A (-28)
80A (-34)
120A (-28) 120A (-35) 160A (-28) 160A (-40)
A
B
C
D
E
F
G
H
I
J
K
L
120
143
80
115
80
127.5
6.5
1
18
M6
12
33
120
143
80
115
80
127.5
6.5
1
18
M6
12
33
130
153
115
125
90
137.5
6.5
1
18
M6
13
50
130
153
115
125
90
137.5
6.5
1
18
M6
13
50
140
153
125
125
100
137.5
6.5
1.5
18
M6
13
50
160
170
110
140
110
153.5
6.5
1.5
33.5
M10
17.5
30
160
170
110
140
110
153.5
6.5
1.5
39
M10
17.5
30
180
170
130
140
130
153.5
6.5
1.5
33.5
M10
17.5
30
180
170
140
140
130
153.5
6.5
1.5
45
M10
17.5
30
200
170
130
140
150
153.5
6.5
1.5
33.5
M10
17.5
30
200
170
160
140
150
153.5
6.5
1.5
49.5
M10
17.5
30
All dimensions in mm; 1 inch = 25.4mm
Tolerances according: ISO 2768-m / EN 22768-m
Filter input/output connector cross sections
-28 (M10)
-34
-35
-40
-46
-47
-52
Solid wire
Flex wire
AWG type wire
Recommended torque
n/a
n/a
n/a
15 - 17Nm
35mm
2
25mm
2
AWG 2
4.0 - 4.5Nm
50mm
2
50mm
2
AWG 1/0
7 - 8Nm
95mm
2
95mm
2
AWG 4/0
17 - 20Nm
10mm
2
6mm
2
AWG 10
0.7 - 0.8Nm
16mm
2
10mm
2
AWG 8
1.9 - 2.2Nm
25mm
2
16mm
2
AWG 4
1.9 - 2.2Nm
Please visit www.schaffner.com to find more details on filter connectors.
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May 2011
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To find your local partner within
Schaffner‘s global network, please go to
www.schaffner.com
May 2011
© 2011 Schaffner EMC.
Specifications subject to change without
notice. All trademarks recognized.
Schaffner is an ISO-registered company.
Its products are designed and manufac-
tured under the strict quality and environ-
mental requirements of the ISO 9001 and
ISO 14001 standards.
This document has been carefully
checked. However, Schaffner does not
assume any liability for errors or inac-
curacies.
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