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
DERATING CURVE
1/4W, 1/2W, 1W, 2W, 3W, 4W, 5W, 7W
±1%, ±5%
±350ppm/°C
UL-94V-0
UL-1412
Rated Load (%)
INTRODUCTION
The resistor element is a resistive wire which is
wound in a single layer on a ceramic rod, with
For resistors operated in ambient temperatures above 40°C, power rating must be derated
in accordance with the curve below.
40 70 155 275 °C
100
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.
80
60
40
20
3W-7WS
1/4W-3WS
Overload protection without risk of fire. Wide
50
100 150 200 250 300
Ambient Temperature (°C)
range of overload currents.
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
DIMENSION
Unit: mm
Normal
FKN-25
Miniature
FKN50S
L
6.3±0.5
?D
2.4±0.2
H
28±2.0
?d
0.55±0.05
?d
FKN-50
FKN1WS
9.0±0.5
3.3±0.3
26±2.0
0.55±0.05
H
L
?D
FKN100
FKN2WS
11.5±1.0
4.5±0.5
35±2.0
0.8±0.05
FKN200
FKN3WS
15.5±1.0
5.0±0.5
33±2.0
0.8±0.05
th color code: white
FKN300
FKN400
FKN500
FKN5WS
FKN7WS
17.5±1.0
24.5±1.0
6.5±0.5
8.0±0.5
32±2.0
38±2.0
0.8±0.05
0.8±0.05
Note: FKN1WS ( for MB Type ) ?d = 0.8±0.05 mm
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