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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
159 Fuse and Clip Series
Average Time Current Curves
Temperature Re-rating Curve
Maximum Temperature Rise
Telecom Nano
2®
Fuse Temperature
04611.25 ≤82
o
C (180
o
F)
0461002 ≤50
o
C (122
o
F)
Electrical Specifications by Item
Ampere
Rating
(A)
Amp Code
Max
Voltage Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal Melting
I
2
t (A
2
sec)
Agency Approvals
0.50 .500 600
60 A @600 VAC
0.560 0.840
1
x
1.25 1.25 600 .1040 16.5
1
x
2.00 002. 600 .0450 1 7. 5
1
x
1
I
2
t is calculated at 10 msecs. 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.
10001001010.1
0.001
0.01
0.1
1
10
100
CURRENT IN AMPERES
TIME IN SECONDS
1.25A 2A .500A
TIA-968-A (formerly FCC part 68) Surge Waveforms
Surge Voltage (V) Waveform (µs) Current (A) Repititions Recommended Fuse
Metallic A 800 10×560 100 1 ea. polarity 1.25
Longitudinal A 1500 10×160 200 1 ea. polarity 1.25
Metallic B 1000 9×720 25 1 ea. polarity 1.25
Longitudinal B 1500 9×720 37.5 1 ea. polarity 1.25
(fuse can not open during type B events)
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.
Note:
1. Re-rating depicted in this curve is in addition to the standard re-rating of 25% for
continuous operation.