®
Bu s s m a n n
S MD TRON® S u rfa c e Mo u n t Fu s e s
Fo r .1 7 0 ” x .2 9 4 ” (4 .3 2 m m x 7 .4 7 m m ) Fu s e s
S FT
R
Time-Current Characteristic CurvesÐAverage Melt
(Full Size Curves Available)
AMPERE RATING
10
Catalog Symbol:
SFT
Characteristics: Fast-Acting, Current-Limiting
Construction: Solid Matrix
Dimensional Data
.29" (± .015)
(7.47 mm) (± .006)
1
.17" (± .015)
(4.32 mm) (± .006)
.12" (± .015)
(3.05 mm) (± .006)
.1
(1.27 mm)
.05"
.09" (± .015)
(2.29 mm) (± .006)
*Packaging & Ordering Information:
SFT
(See Table)
Product
Symbol
Rated Current
.01
Package Code
CURRENT IN AMPERES
TR/
500 pcs., on a 7” reel, 16mm tape width.
TR1/ 2000 pcs., on a 13” reel, 16mm tape width.
TR2/ 500 pcs., on a 7” reel, 12mm tape width.
TR3/ 2500 pcs., on a 13” reel, 12mm tape width.
Weight = .6 lbs/500
Time-Current Characteristics:
Percent of Rating
Rated
Current
0-10
100%
250%
5 sec. (max)
4 hrs. (min)
*See page 2.
Electrical Characteristics
Typical Voltage
Drop2 Volts at
100% Rated
Current
Agency**
Approvals
Rated
Interrupting
Rating1
Pre-arcing
I2T (A sec)
Typical Total Clearing3
2
2
Rated
Current5
63mA
125mA
250mA
375mA
500mA
750mA
1
1.5
2
2.5
3
3.5
4
5
7.0A
10.0A
12.5A
Voltage
I2T (A sec)
AC (Max.)
DC (Max.)
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
90V
AC
DC
AC
DC
AC
DC
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
60V
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
50A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
300A
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
-5
-6
-4
-6
-5
-5
-4
7.49 x 10
3.17 x 10
4.46 x 10
1.72 x 10
.0099
.0302
.0784
.1775
.3355
.4980
.8855
1.7264
1.64
3.79
5.1 x 10
2.0 x 10
6.29 x 10
2.67 x 10
4.63 x 10
2.77 x 10
.0076
.8
.75
.66
.525
.12
-4
-4
-3
-5
-4
-4
-3
2.18 x 10
4.18 x 10
5.74 x 10
2.59 x 10
.0114
-5
3.8 x 10
2.27 x 10
.0069
.0204
.0651
.1390
.2419
.3812
.6785
1.2912
.518
-4
.0345
.0246
.20
.0891
.0811
.170
.145
.130
.155
.135
.125
.114
.130
.090
.2383
.1574
.4359
.2664
.6355
.4696
1.0740
2.3779
1.97
.7829
1.3556
.573
60V
48V
90V
60Vꢀ
1.06
4.04
3.92
1.67
15
20
4.28
**Approvals: UL Recognition, Std. 248-14, Guide #JDYX2, File #E19180; CSA Certification, C22.2 No. 248.14, Class #1422-01, File #53787.
ꢀ NOTE: SFT 12.5A is UL recognized on AC Only.
1. Interrupting ratings were measured at 100% power factor on AC, and a time constant less than 1ms on DC.
2. Voltage drop was measured at 25°C ± 3°C ambient temperature at rated current with device mounted on a circuit trace.
3. I2t measured at 50 amp, 125 VAC, .95PF, random closing angle; 300 amps, 125 VDC, TC<1ms.
4. Electrical characteristics for 12.5 amp to be determined.
5. Device designed to carry 125% of rated current for one hour minimum. An operating current of 80% or less of rated current is recommended, with further derating
required at elevated ambient temperatures.
CE logo denotes compliance with European Union Low Voltage Directive
(50-1000 VAC, 75-1500 VDC). Refer to BIF document #8002 or contact
Bussmann Application Engineering at 314-527-1270 for more information.
Form No. SFT
Page 1 of 2
BIF Doc #2005
12-28-98
SB98107
Rev. A
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