Leaded ResistoRs
Fusible Wirewound
Resistors
Flame-Proof Type
Normal & Miniature Style [ FKN Series ]
FeatURes
Power Rating
Resistance Tolerance
T.C.R.
Flameproof Multi-layer Coating Meets
Flameproof Feature Meets Overload Test
1/4W, 1/2W, 1W, 2W, 3W, 4W, 5W, 7W
±1%, ±5%
±350ppm/°C
UL-94V-0
UL-1412
iNtRodUCtioN
The resistor element is a resistive wire which
is wound in a single layer on a ceramic rod,
tinned connecting wires of electrolytic copper
are welded to the end-caps. The ends of the
resistance wire and the leads are connected to
the caps by welding. The resistors are coated
with layers of green color flame proof lacquer.
Overload protection without risk of fire. Wide
range of overload currents.
deRatiNG CURVe
For resistors operated in ambient temperatures above 40°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
40 70
100
80
60
40
20
50
100 150 200 250 300
3W-7W
1/4W-3WS
155
275 °C
Ambient Temperature (°C)
diMeNsioNs
stYLe
Normal
FKN-25
ød
H
L
th color code: white
øD
FKN-50
FKN100
FKN200
FKN300
FKN400
FKN500
Note: FKN1WS ( for MB Type ) ød = 0.8±0.05 mm
Unit: mm
diMeNsioN
Miniature
FKN50S
FKN1WS
FKN2WS
FKN3WS
FKN5WS
FKN7WS
L
6.3±0.5
9.0±0.5
11.5±1.0
15.5±1.0
17.5±1.0
24.5±1.0
ød
2.4±0.2
3.3±0.3
4.5±0.5
5.0±0.5
6.5±0.5
8.0±0.5
H
28±2.0
26±2.0
35±2.0
33±2.0
32±2.0
38±2.0
ød
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
0.8±0.05
0.8±0.05
3
eLeCtRiCaL CHaRaCteRistiCs
NoRMaL stYLe
stYLe
Power Rating at 70°C
Dielectric Withstanding Voltage
Resistance Range
Operating Temp. Range
Temperature Coefficient
FKN-25
1/4W
200V
2.5
Ω
- 22
Ω
-40°C to +155°C
±350ppm/°C
FKN-50
1/2W
300V
0.8
Ω
- 47
Ω
0.5
Ω
- 100
Ω
0.1
Ω-150 Ω
0.1
Ω
- 330
Ω
0.1
Ω
- 390
Ω
FKN100
1W
FKN200
2W
FKN300
3W
FKN400
4W
FKN500
5W
MiNiatURe stYLe
stYLe
Power Rating at 70°C
Dielectric Withstanding Voltage
Resistance Range
Operating Temp. Range
Temperature Coefficient
FKN50s
1/2W
200V
2.5
Ω
- 22
Ω
-40°C to +155°C
±350ppm/°C
FKN1Ws
1W
300V
0.8
Ω
- 47
Ω
0.5
Ω
- 100
Ω
0.1
Ω
- 150
Ω
0.1
Ω
- 330
Ω
0.1
Ω
- 390
Ω
FKN2Ws
2W
FKN3Ws
3W
FKN5Ws
5W
FKN7Ws
7W
Note: Special value is available on request
eNViRoNMeNtaL CHaRaCteRistiCs
PeRFoRMaNCe test
Short Time Overload
Dielectric Withstanding Voltage
Temperature Coefficient
Insulation Resistance
Solderability
Resistance to Solvent
Terminal Strength
Load Life in Humidity
Load Life
Temperature Cycling
Resistance to Soldering Heat
Overload Flame Retardant
test MetHod
JIS-C-5202 5.5
JIS-C-5202 5.7
JIS-C-5202 5.2
JIS-C-5202 5.6
JIS-C-5202 6.5
JIS-C-5202 6.9
JIS-C-5202 6.1
JIS-C-5202 7.9
JIS-C-5202 7.10
JIS-C-5202 7.4
JIS-C-5202 6.4
JIS-C-5202 7.12
2.5 times RCWV for 5 Sec.
in V-Block for 60 Sec.
-40°C to +155°C
in V-Block
260±5°C for 5±0.5 Sec.
IPA for 1 Min. with ultrasonic
Direct load for 10 Sec. In the direction of the terminal leads
40±2°C, 90 - 95% RH at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
70°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
-55°C
Room Temp.
+155°C
Room Temp. (5 cycles)
350±10°C for 3±0.5 Sec.
4 times RCWV for 1 Min.
aPPRaise
±2.0%+0.05
Ω
By type
By type
>100M
Ω
95% Min. coverage
No deterioration of
coatings and markings
≥2.5kg
(24.5N)
±5.0%+0.05
Ω
±5.0%+0.05
Ω
±1.0%+0.05
Ω
±1.0%+0.05
Ω
No evidence of flaming
or arcing
Note: Rated Continuous Working Voltage (RCWV) =
Power Rating x Resistance Value
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