TeleLink Fuse
http://www.teccor.com 2 - 66 © 2002 Teccor Electronics
+1 972-580-7777 SIDACtor® Data Book and Design Guide
TeleLink Fuse
The TeleLink Surface Mount (SM) surge resistant fuse offers circuit protection without
requiring a series resistor. When used in conjunction with the SIDACtor Transient Voltage
Suppressor (TVS), the TeleLink SM fuse and the SIDACtor TVS provide a complete
regulatory-compliant solution for standards such as GR 1089, TIA/EIA-IS-968, UL 60950,
and ITU K.20 and K.21 (formerly known as FCC Part 68). No series resistor is required for
the F1250T and F1251T to comply with these standards.
Contact factory for enhanced K.20 and K.21 details.
* Interrupt test characterized at 50° to 70° phase angle. Phase angles approximating 90° may result in damage to the body of the fuse.
Notes:
• The TeleL ink SM fuse is designed to carry 100% of its rated current for four hours and 250% of its rated current for one second
minimum and 120 seconds maximum. Typical time is four to 10 seconds. For optimal performance, an operating current of 80% or
less is recommended.
• I2t is a non-repetitive RMS surge current rating for a period of 16.7 ms.
Notes:
• Typical inductance ≅ 4 µH up to 500 MHz.
• Resistance changes 0.5% for every °C.
• Resistance is measured at 10% rated current.
Surge Ratings
TeleLink SM Fuse
IPP
2x10 µs
Amps
IPP
10x160 µs
Amps
IPP
10x560 µs
Amps
IPP
10x1000 µs
Amps
F0500T not rated 75 45 35
F1250T 500 160 115 100
F1251T 500 160 115 100
Interrupting Values
TeleLink SM
Fuse
Voltage
Rating
Current
Rating
I2t Measured
at DC Rated
Voltage
Interrupting Rating
Voltage, Current MIN TYP MAX
F0500T 250 V 500 mA 1.3 A2s 600 V, 40 A 1 ms 2 ms 60 ms
F1250T 250 V 1.25 A 22.2 A2s 600 V, 60 A * 1 ms 2 ms 60 ms
F1251T 250 V 2 A 30 A2s 600 V, 60 A * 1 ms 2 ms 60 ms
Resistance Ratings
TeleLink SM Fuse
Typical Voltage Drop
@ Rated Current
DC Cold Resistance
MIN MAX
F0500T 0.471 V 0.420 Ω0.640 Ω
F1250T 0.205 V 0.107 Ω0.150 Ω
F125 1T 0.110 V 0.050 Ω0.100 Ω
TeleLink Fuse
© 2002 Teccor Electronics 2 - 67 http://www.teccor.com
SIDACtor® Data Book and Design Guide +1 972-580-7777
Data Sheets
Qualification Data
The F1250T and F1251T meet the following test conditions per GR 1089 without additional series resistance.
However, in-circuit test verification is required. Note that considerable heating may occur during Test 4 of the
Second Level AC Power Fault Test.
* Test 5 simulates a high impedance induction fault. For specific information, please contact Teccor Electronics.
Notes:
• Power fault tests equal or exceed the requirements of UL 60950 3rd edition.
• Test 4 is intended to produce a maximum heating effect. Temperature readings can exceed 150 °C.
• Test 2 may be dependent on the closing angle of the voltage source. Fuse is characterized at 50° to 70°. Closing angles
approximating 90° may result in damage to the body of the fuse.
• Use caution when routing internal traces adjacent to the F1250T and F1251T.
First Level Lightning Surge Test
Test
Surge Voltage
Volts
Wave-form
µs
Surge Current
Amps
Repetitions Each
Polarity
1 ±600 10x1000 100 25
2 ±1000 10x360 100 25
3 ±1000 10x1000 100 25
4 ±2500 2x10 500 10
5 ±1000 10x360 25 5
Second Level Lightning Surge Test
Test
Surge Voltage
Volts
Wave-form
µs
Surge Current
Amps
Repetitions Each
Polarity
1 ±5000 2x10 500 1
First Level AC Power Fault Test
Test
Applied Voltage, 60 Hz
VRMS
Short Circuit Current
Amps Duration
1500.3315 min
2 100 0.17 15 min
3 200, 400, 600 1 at 600 V 60 applications, 1 s each
4 1000 1 60 applications, 1 s each
5 * * 60 applications, 5 s each
6 600 0.5 30 s each
7 600 2.2 2 s each
8 600 3 1 s each
9 1000 5 0.5 s each
Second Level AC Power Fault Test for Non-Customer Premises Equipment
Test
Applied Voltage, 60 Hz
VRMS
Short Circuit Current
Amps Duration
1 120, 277 30 30 min
2 600 60 5 s
36007 5 s
4 100-600 2.2 at 600 V 30 min
TeleLink Fuse
http://www.teccor.com 2 - 68 © 2002 Teccor Electronics
+1 972-580-7777 SIDACtor® Data Book and Design Guide
Time Current Curve
Time in seconds
Current in Amperes
.01
.02
.03
.04
.05
.06
.07
.08
.09
.1
.2
.3
.4
.5
.6
.7
.8
.9
1
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
1000
F0500T
F1250T F1251T
.1
.2
.3
.4
.5
.6
.7
.8
.9
1
2
3
4
5
6
78
9
10
20
30
40
50
60
70
80 90
100
TeleLink Fuse
© 2002 Teccor Electronics 2 - 69 http://www.teccor.com
SIDACtor® Data Book and Design Guide +1 972-580-7777
Data Sheets
Temperature Derating Curve
Operating temperature is -55 °C to +125 °C with proper correction factor applied.
Chart of Correction Factor
* Higher currents and PCB layout designs can affect this parameter.
Notes:
• Readings are measured at rated current after temperature stabilizes
• The F1250T meets the requirements of UL 248-14. However, board layout, board trace widths, and ambient
temperature values can cause higher than expected rises in temperature. During UL testing, the typical
recorded heat rise for the F1250T at 2.2 A was 120 °C.
Maximum Temperature Rise
TeleLink Fuse Temperature Reading
F0500T ≤75 °C (167 °F) *
F1250T ≤75 °C (167 °F) *
F1251T ≤75 °C (167 °F) *
30
-55 -60 -40 -20 0 20 40 60 80 100 125
40
50
60
70
80
90
100
110
Ambient ˚C
Percent of Rating
Effect on
Current Rating
120
130
140
150
Package Symbolization
Marking F0500T F1250T F1251T
Manufactured in
USA
Manufactured in
Tai wan
FU F U
FT F T
JU J U
JT J T
NU N U
NT N T
