Surface Mount Fuses
Miniature Surface Mount
RoHS
TeleLink
®
Fuse
461 Series
®
®
• Surface mount surge resistant Slo-Blo
®
fuse.
• Meets UL 60950 3rd Edition power cross requirements stand
alone.
• Designed to allow compliance with Telcordia GR-1089-CORE
and TIA-968-A
(formerly FCC Part 68)
Surge Specifications.
• Provides coordinated protection with Littelfuse SIDACtor
®
Protection Thyristors without series resistors.
• Ideal for use in telecommunication equipment including line
cards, modems, fax machines, phones, answering machines,
caller ID devices and other products connected to phone
network.
• 2A rating has improved temperature rise performance under
2.2A surge current testing when compared with 1.25A rating.
• Product is
RoHS Compliant
and compatible with lead-free
solders and higher temperature profiles when ordered with
Standard Silver Plated Brass Caps.
• Standard product is
RoHS Compliant
and compatible with
lead-free solders and higher temperature profiles.
AGENCY APPROVALS:
Recognized under the Components
Program of Underwriters Laboratories and Certified by CSA.
Littelfuse:
Teccor:
UL E10480
CSA LR29862
UL E191008
CSA LR702828
Reference Dimensions:
3.25
(.128")
3.12
(.123")
6.10
(.240")
12.6
(.496")
1.70 typ
(.067")
Recommended Pad Layout
3.43
(.135")
10.10
(.397")
F
L 1.25A
T
3.12
(.123")
PHYSICAL SPECIFICATIONS:
Materials:
Body: Ceramic
RoHS Compliant Terminations: Silver Plated Brass Caps
Terminations: Tin-Lead Alloy also available, add suffix, T.
Soldering Parameters:
Reflow Solder — 260°C, 30 seconds maximum.
Wave Solder — 260°C, 3 seconds maximum.
PACKAGING SPECIFICATIONS:
24mm Tape and Reel
per EIA-RS481-2, (IEC 286 part 3); 2500 fuses per reel,
add suffix, ER.
ORDERING INFORMATION:
Telecom
Nano
2
Catalog
Number
0461.500
0461
1.25
0461
002.
Teccor
TeleLink
Nominal
Catalog Ampere Voltage Resistance
Number Rating Rating Cold Ohms
F0500T
0.5
600
.560
F1250T
1.25
600
.110
F1251T
2.00
600
.050
.500A
1.25A
100
10
TIME IN SECONDS
Nominal
Melting I
2
t
A
2
Sec.
.840
1
16.5
1
17.5
1
1
0.1
Notes:
1 2
I t is calculated at 10 msec or less. I
2
t at 10 times rated current has a typical value of:
24 A
2
sec (2.0A), 22 A
2
sec (1.25A), 1.3 A
2
sec (0.5A).
• Typical inductance < 40nH up to 500 MHz.
• Resistance changes 0.5% for every ˚C.
• Resistance is measured at 10% rated current.
0.01
0.001
0.1
1
10
CURRENT IN AMPERES
2A
100
1000
380
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Surface Mount Fuses
Miniature Surface Mount
RoHS
TeleLink
®
Fuse
461 Series
Maximum Temperature Rise:
OpeningTime
4 hours,
Min.
1 Second,
Min.;
120 Seconds,
Max.
• Higher Currents and PCB layout designs can affect this parameter.
Readings are measured at rated current after temperature stabilizes.
Temperature Derating Curve
®
®
ELECTRICAL CHARACTERISTICS:
% of AmpereRating
100%
250%
Telecom Nano
2
Fuse
04611.25
0461002.
Temperature Reading
< 82˚C (180˚F)
< 50˚C (122˚F)
INTERRUPTING RATINGS:
60 amperes at 600 VAC.
GR 1089 Inter-building requirements
GR 1089 1
st
level lighting surge inter-building
(Equipment under test can not be damaged & must
continue to operate properly)
PERCENT OF RATING*
140
120
100
80
60
40
20
Operating Temperature is -55˚C to +125˚C with proper correction factor applied
Surge Minimum
Peak
Voltage
(V)
1
600
2
1000
3
1000
4
2500
5
1000
Minimum
Max
Repetitions
Fuse
Peak
Rise/Min.
Each
Choices
Current
Decay
Polarity
(A)
(µs)
100
10/1000
25
1.25, 2.0
100
10/360
25
1.25, 2.0
100
10/1000
25
1.25, 2.0
500
2/10
10
1.25, 2.0
25
10/360
5
0.5, 1.25, 2.0
If sufficient series resistance is used, then the 0.5 fuse may be used in test conditions 1-4.
GR 1089 2
nd
level lightning surge telecom port (Equipment
under test shall not become a fire, fragmentation, or electri-
cal safety hazard)
Surge
Minimum Minimum
Max
Repetitions
Fuse
Peak
Peak
Rise/Min.
Each
Choices
Voltage
Current
Decay
Polarity
(V)
(A)
(µs)
1
5000
500
2/10
1
0.5, 1.25, 2.0
alternative
5000
5000/8=625
8/20
1
0.5, 1.25, 2.0
The 0.5 fuse will open during these test conditions. The 1.25 & 2.0 will not open thus providing
operational compliance.
0°C
20°C 40°C
60°C 80°C 100°C
32°F 68°F 104°F 140°F 176°F 212°F
AMBIENT TEMPERATURE
• Ambient temperature effects are in addition to the normal derating.
-60°C
-76°F
-40°C
-40°F
-20°C
-4°F
120°C
248°F
10
SURFACE MOUNT
FUSES
381
GR 1089 AC power fault 1
st
level inter-building
(fuse not allowed to open)
Test
Short
Circuit
Current
(A)
50
.33
100
.17
200,400, 600
1
1000
1
Diagram
Diagram
600
0.5
440
2.2
600
3
1000
5
Vrms
Duration
Primary
Protector
removed
removed
removed
operative
removed
removed
removed
removed
in place
Fuse
Choices
1.25,
1.25,
1.25,
1.25,
1.25,
1.25,
1.25,
1.25,
1.25,
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
1
2
3
4
5
6
7
8
9
15 min.
15 min
60 x 1 sec.
60 x 1 sec.
60 x 5 sec.
30s
5 x 2 sec.
1.1 sec.
0.4 sec.
GR 1089 AC power fault 2
nd
level (fuse can open but must
open in a safe and controlled manner)
Test
Circuit
1
2
3
4
5
Vrms
120, 277
600
600
100-600
Diagram
Short
(A)
25
60
7
2.2
Diagram
Duration
15 min.
5 sec.
5 sec.
15 min..
15 min.
Fuse
0.5,
0.5,
0.5,
0.5,
0.5,
1.25,
1.25,
1.25,
1.25,
1.25,
2.0
2.0
2.0
2.0
2.0
Fuse must open before wiring simulator fuse (MDL 2.0).
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Surface Mount Fuses
Miniature Surface Mount
RoHS
TeleLink
®
Fuse
461 Series
®
®
TIA –968-A (formerly FCC Part 68) Surge Waveforms
(fuse can not open during type B events)
Voltage Waveform Current
(V)
(µs)
(A)
Metallic A
800
10 x 560
100
Longitudinal A
1500
10 x 160
200
Metallic B
1000
9 x 720
25
Longitudinal B
1500
9 x 720
37.5
Surge
Waveform
(µs)
10 x 560
10 x 160
5 x 320
5 x 320
Reps
1
1
1
1
ea. polarity
ea. polarity
ea. polarity
ea. polarity
Recommended
Fuse
1.25
1.25
1.25
1.25
For the type A events the 0.5 fuse will open, providing non-operational compliance. The 1.25 & 2.0 will not open, providing
for operational compliance with TIA-968-A type A surge events.
UL 60950 requirements
UL60950 (EN 60950) (formerly UL 1950) Power
Cross (L = longitudinal, M = metallic)
Test
Voltage
Number
(V)
L1
600
L2
600
L3
600
L4
200
L5
120
M1
600
M2
600
M3
600
M4
600
Current
(A)
40
7
2.2
2.2
25
40
7
2.2
2.2
Time
1.5 sec.
5 sec.
30 min.
30 min.
30 min.
1.5 sec.
5 sec.
30 min.
30 min.
Fuse
Choices
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
Selection of test number depends on current limiting & fire enclosure/spacing of
end product
• 26 AWG line cord removes L1/M1 test requirement
• L5 conducted only if product does not pass section 6.1.2
• L2,M2,L3,M3,L4,M4 conducted if not in a fire enclosure
Fuse must open before the wiring simulator fuse (MDL 2.0).
UL60950 (EN 60950) (formerly UL 1950)
Impulse Test & Steady-state electric strength test
Test
Impulse
For handheld units
Non handheld
Steady-State
For handheld units
Non handheld
Voltage Current
(V)
(A)
2500
1500
1500
1000
62.5
37.5
Waveform
Repetitions
Fuse
Choices
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
0.5, 1.25, 2.0
10 x 700µs + 10 w/60 sec. rest
10 x 700µs + 10 w/60 sec. rest
60Hz
60Hz
382
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