Document
Wirewound Resistors
Through-hole resistors
Fusible & Flame-Proof Type
Normal & Miniature Style [ FKN Series ]
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.
DIMENSIONS
ød H L øD
5th color code: white
Note: FKN1WS ( for MB Type ) ød = 0.8±0.05 mm
FEATURES
Power Rating Resistance Tolerance T.C.R. Flameproof Multi-layer Coating Meets Flameproof Feature Meets Overload Test
1/2W, 1W, 2W, 3W, 4W, 5W, 7W ±1%, ±5% ±350ppm/°C 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.
Rated Load (%)
40 70 100
80
60
155
275 °C
3W-7WS 1/2WS-3WS
40
20
50 100 150 200 250 300
Ambient Temperature (°C)
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
STYLE Normal FKN-50 FKN100 FKN200 FKN300 FKN400 FKN500
DIMENSION
Miniature
L
FKN50S
6.3±0.5
FKN1WS
9.0±0.5
FKN2WS
11.5±1.0
FKN3WS
15.5±1.0
FKN5WS
17.5±1.0
FKN7WS
24.5±1.0
øD 2.5±0.3 3.5±0.3 4.6±0.5 5.2±0.5
6.5±0.5
8.5±0.5
H 28±2.0 26±2.0 35±2.0 33±2.0
32±2.0
38±2.0
Unit: mm
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
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ELECTRICAL CHARACTERISTICS
Normal STYLE
STYLE
FKN-50
FKN100
Power Rating at 40°C
Power Rating at 70°C
1/2W
1W
Maximum working voltage
PxR
Voltage Proof on Insulation
300V
Resistance Range (±1%)
0.5Ω - 100Ω
Resistance Range (±5%)
0.5Ω - 47Ω
0.5Ω - 100Ω
Operating Temp. Range
-40°C to +155°C
Temperature Coefficient
±350ppm/°C
Note: Special value is available on request
FKN200 2W
FKN300 3W
FKN400 4W
0.47Ω - 150Ω 0.47Ω - 150Ω
0.56Ω - 330Ω 0.56Ω - 330Ω
FKN500 5W
1Ω - 620Ω 1Ω - 620Ω
MINIATURE STYLE
STYLE Power Rating at 40°C Power Rating at 70°C Maximum working voltage Voltage Proof on Insulation Resistance Range (±1%) Resistance Range (±5%) Operating Temp. Range Temperature Coefficient
FKN50S
1/2W PxR
200V
2.5Ω - 22Ω -40°C to +155°C ±350ppm/°C
Note: Special value is available on request
FKN1WS
1W
300V 0.47Ω - 62Ω 0.47Ω - 62Ω
FKN2WS 2W
FKN3WS 3W
FKN5WS 5W
FKN7WS 7W
0.47Ω - 150Ω 0.47Ω - 150Ω
0.47Ω - 240Ω 0.47Ω - 240Ω
0.56Ω - 330Ω 0.56Ω - 330Ω
1Ω - 620Ω 1Ω - 620Ω
ENVIRONMENTAL CHARACTERISTICS
PERFORMANCE TEST
TEST METHOD
Short Time Overload
IEC 60115-1 4.13 10 times rated power for 5 Sec.
Voltage Proof on Insulation Temperature Coefficient
IEC 60115-1 4.7 IEC 60115-1 4.8
in V-block for 60 Sec., test voltage by type -55°C to +155°C
Insulation Resistance Solderability
IEC 60115-1 4.6 IEC 60115-1 4.17
in V.