Through-hole resisTors
Fusible &
Flame-Proof Type
Wirewound Resistors
Normal & Miniature Style [ FKN Series ]
FeATures
Power Rating
1/2W, 1W, 2W, 3W, 4W, 5W, 7W
±1%, ±5%
ResistanceTolerance
T.C.R.
±350ppm/°C
Flameproof Multi-layer Coating Meets
Flameproof Feature Meets OverloadTest
UL-94V-0
UL-1412
DerATiNg CurVe
For resistors operated in ambient temperatures above 40°C, power rating must be derated
in accordance with the curve below.
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 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.
40 70
155
275 °C
Rated Load (%)
100
80
3W-7WS
1/2WS-3WS
60
40
20
Ambient Temperature (°C)
50 100 150 200 250 300
FusiNg ChArACTerisTiCs
R≤2.0Ω Fusing time within 60 seconds at 36 times of rated power
R>2.0Ω Fusing time within 60 seconds at 25 times of rated power
Fusing residual resistive value at least 100 times rated resistance
DiMeNsioNs
Unit: mm
sTYle
DiMeNsioN
Mꢃnꢃatꢄꢁꢅ
Nꢀꢁmaꢂ
l
øD
h
ød
-
FKN50S
6.3±0.5
2.5±0.3
3.5±0.3
4.6±0.5
5.2±0.5
28±2.0
26±2.0
35±2.0
33±2.0
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
ød
FKN-50
FKN100
FKN200
FKN300
FKN400
FKN500
FKN1WS
FKN2WS
FKN3WS
9.0±0.5
11.5±1.0
15.5±1.0
H
L
øD
5th color code: white
FKN5WS
FKN7WS
17.5±1.0
24.5±1.0
6.5±0.5
8.5±0.5
32±2.0
38±2.0
0.8±0.05
0.8±0.05
Note: FKN1WS ( for MBType ) ød = 0.8±0.05 mm