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