Leaded ResistoRs
Wirewound Resistors
Fusible &
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
deRatiNG CURVe
iNtRodUCtioN
The resistor element is a resistive wire which is
wound in a single layer on a ceramic rod, with
tinned connecting wires of electrolytic copper
welded to the end-caps. The ends of the
resistive 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.
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-7WS
1/4W-3WS
155
275 °C
Ambient Temperature (°C)
FUsiNG CHaRaCteRistiCs
R≤2.0
Ω
Fusing time within 60 seconds at 36 times of rated power
R>2.0
Ω
Fusing time within 60 seconds at 25 times of rated power
Fusing residual resistive value at least 100 times rated resistance
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
eLeCtRiCaL CHaRaCteRistiCs
NoRMaL stYLe
stYLe
Power Rating at 40°C
Power Rating at 70°C
Voltage Proof
Resistance Range (±1%)
Resistance Range (±5%)
Operating Temp. Range
Temperature Coefficient
2.5
Ω
- 22
Ω
-40°C to +155°C
±350ppm/°C
0.5
Ω
- 47
Ω
1/4W
200V
1/2W
300V
0.5
Ω
- 100
Ω
0.5
Ω
- 100
Ω
0.47
Ω
- 150
Ω
0.47
Ω
- 150
Ω
0.56
Ω
- 330
Ω
0.56
Ω
- 330
Ω
1
Ω
- 620
Ω
1
Ω
- 620
Ω
1W
2W
FKN-25
FKN-50
FKN100
FKN200
FKN300
3W
FKN400
4W
FKN500
5W
Note: Special value is available on request
MiNiatURe stYLe
stYLe
Power Rating at 40°C
Power Rating at 70°C
Voltage Proof
Resistance Range (±1%)
Resistance Range (±5%)
Operating Temp. Range
Temperature Coefficient
2.5
Ω
- 22
Ω
-40°C to +155°C
±350ppm/°C
1/2W
200V
1W
300V
0.47
Ω
- 62
Ω
0.47
Ω
- 62
Ω
0.47
Ω
- 150
Ω
0.47
Ω
- 150
Ω
0.47
Ω
- 240
Ω
0.47
Ω
- 240
Ω
0.56
Ω
- 330
Ω
0.56
Ω
- 330
Ω
1
Ω
- 620
Ω
1
Ω
- 620
Ω
2W
3W
FKN50s
FKN1Ws
FKN2Ws
FKN3Ws
FKN5Ws
5W
FKN7Ws
7W
Note: Special value is available on request
eNViRoNMeNtaL CHaRaCteRistiCs
PeRFoRMaNCe test
Short Time Overload
Voltage Proof
Temperature Coefficient
Insulation Resistance
Solderability
Solvent Resistance of Marking
Robustness of Terminations
Damp Heat Steady State
Endurance at 70°C
Temperature Cycling
Resistance to Soldering Heat
Accidental Overload Test
test MetHod
IEC 60115-1 4.13
IEC 60115-1 4.7
IEC 60115-1 4.8
IEC 60115-1 4.6
IEC 60115-1 4.17
IEC 60115-1 4.30
IEC 60115-1 4.16
IEC 60115-1 4.24
IEC 60115-1 4.25
IEC 60115-1 4.19
IEC 60115-1 4.18
IEC 60115-1 4.26
10 times rated power for 5 Sec.
in V-block for 60 Sec., test voltage by type
-55°C to +155°C
in V-block for 60 Sec.
235±5°C for 3±0.5 Sec.
IPA for 5±0.5 Min. with ultrasonic
Direct load for 10 Sec. in the direction of the terminal leads
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
70±2°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)
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body
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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