FUSIBLE RESISTORS
FM, FKN, & FSQ Series: Fusible
INTRODUCTION
The fusible resistor contains two functions in one
package. It's a resistor under normal conditions and a
fuse when subjected to higher than normal current.
RoHS
ü
FEATURES
•High stability, accuracy, and reliability
•Non combustible coating
•Uniform fusing time
FUSING CHARACTERISTICS
Fusing Time
Minimum Nominal Maximum
16 X Wattage 3 Sec.
30 Sec.
1 Min.
20
2 Sec.
15 Sec. 30 Sec.
24
1 Sec.
5 Sec.
10 Sec.
28
0.8 Sec. 3 Sec.
7 Sec.
32
0.8 Sec. 2 Sec.
4 Sec.
Power
Rated Load (%)
80
60
40
20
0
DERATING CURVE
100
70°C
FM
FKN & FSQ
•Fusing times not listed, may be available.
Contact RFE International, Inc. for details.
235°C
0
50
100
150
200
250
275°C
300
350
400
Ambient Temperature (°C)
SPECIFICATIONS
FKN & FM
FSQ
FM is fusible metal film
FKN & FSQ is fusible wirewound
Wattage
Type
Dimension(mm)
d±0.05
0.6
0.65
0.65
0.8
0.8
0.65
0.8
0.8
0.8
0.8
0.65
0.8
0.8
0.8
0.8
Resistance
Max.
Range
Working
( )
Voltage
0.22 - 100K
250
0.22 - 100K
250
0.22 - 100K
300
0.3 - 100K
350
0.3 - 100K
500
0.1 - 22
500
0.1 - 80
500
0.1 - 100
500
0.2 - 200
500
0.3 - 250
500
0.1 - 22
1000
0.1 - 120
1000
0.2 - 120
1000
0.3 - 250
1000
0.3 - 500
1000
Dielectric
Withstanding
Voltage
300
300
500
500
500
500
500
500
500
500
1000
1000
1000
1000
1000
Std
Tolerance
±%
5, 10
5, 10
5, 10
5, 10
5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
L±1.0 D±0.5 H±3 W±0.5 C±3
1/2W
FM50M
6.8
2.6
30
1/2W
FM50
9
3.5
30
1W
FM100
9
4
30
2W
FM200
11
4.5
30
3W
FM300
15
5.5
30
30
1W
FKN1W
9
4.5
2W
FKN2W
11
5
30
3W
FKN3W
13
5.5
30
4W
FKN4W
17
6.5
38
5W
FKN5W
19
6.5
38
2W
FSQ2W
18
7
7
36
3W
FSQ3W
22
8
8
36
5W
FSQ5W
22
9
10
36
7W
FSQ7W
35
9
10
36
10W
FSQ10W
48
9
10
36
•Standard tolerance is ±5% and ±10% for values below 0.5
ELECTRICAL PERFORMANCE
Test Items
Operating Temperature
Resistance Temp. Coeff.
Short Time Overload
Insulation Resistance
Temperature Cycle
Load Life
Moisture-Proof Load Life
Condition
FM
FKN & FSQ
+30°C ~ +150°C
FM: 4X rated wattage for 5 sec.
FKN & FSQ: 2.5X rated wattage for 5 sec.
500V megger
-30°C 85°C for 5 cycles
70°C on-off cycle 1000 hrs
40°C 95@ RH on-off cycle for 1000 hrs
Spec.
-40°C ~ +235°C
-55°C ~ +275°C
±200 ppm/°C(R<1 ohm±440 ppm)
±2%
±2%
1000M ohm
±1%
±5%
±5%
PART NUMBER EXAMPLE
FM 50 R - 10R - J
RFE International
• Tel:(949) 833-1988 • Fax:(949) 833-1788 • E-Mail Sales@rfeinc.com
C2DB01
REV 2002.02.07
RFE [ RFE INTERNATIONAL ]
