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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
NANO
2®
> 157T Fuse and Holder Combination
157T Series – Standard Nano
2®
Fuse and Clip Assembly
Description
The 157T Series Fuse/Clip assembly is a small, square,
Time-Lag, surface mount fuse that is assembled in surface
mountable fuse clips. The unique time delay feature of this
fuse design helps solve the problem of nuisance “opening”
by accommodating inrush currents that normally cause a
fast-acting fuse to open.
The fuse clip and pre-installed fuse combination can
be automatically placed in PC Board in one efficient
manufacturing operation. It permits quick and easy
replacement of fuses without performing desoldering
process, even in the field and without exposing the PC
Board to detrimental effects of rework solder heat.
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E14721 0.375A ~ 5A
PS
E
NBK030205-E10480B 1A - 5A
Features
Electrical Characteristics for Series
• Surface Mountable,
Time-Lag Fuse.
• Fully compatible with
RoHS/Pb-Free solder
alloys and higher
temperature profiles
associated with leadfree
assembly.
• Easily replaceable on PC
Board (Field Replaceable)
• RoHS Compliant and
Halogen-free
• Available in ratings of
0.375 ~ 5 Amperes.
% of Ampere
Rating
% of Ampere
Rating
Opening Time at 25ºC
100% 0.375A ~ 5A 4 hours, Minimum
200% 0.375A ~ 5A
1 sec. Minimum,
60 secs. Maximum
300% 0.375A ~ 5A
0.20 secs. Minimum,
3.00 secs. Maximum
800% 0.375A ~ 5A
0.02 secs. Minimum,
0.10 secs. Maximum
Applications
Ampere
Rating (A)
Amp
Code
Max Voltage
Rating (V)
Interrupting
Rating
(A)
Fuse
Furnished
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I
2
t (A
2
sec)
Agency Approvals
PS
E
0.375 .375 125
50A @ 125VAC/VDC
0454.375 1.2214 0.101 X
0.500 .500 125 0454.500 0.7047 0.240 X
0.750 .750 125 0454.750 0.3602 0.904 X
1.00 001 125 0454001. 0.2245 1.98 X X
1.50 01.5 125 045401.5 0.0934 3.65 X X
2.00 002 125 0454002. 0.0629 8.20 X X
2.50 02.5 125 045402.5 0.0452 15.0 X X
3.00 003 125 0454003. 0.0342 20.16 X X
3.50 03.5 125 045403.5 0.0226 26.53 X X
4.00 004 125 0454004. 0.0188 34.40 X X
5.00 005 125 0454005. 0.0138 53.72 X X
Electrical Specifications by Item
1. Cold resistance measured at less than 10% of rated current at 23ºC.
2. I
2
t values stated for 8ms opening time.
3. Agency Approval Table Key: X=Approved or Certified, P=Pending and Blank=Not Approved
4. Have special electrical characteristic needs? Contact Littelfuse to learn more about application specific options
RoHS
• Instrumentations
• Base Stations
• Telecommunications
PS
E
Application testing is strongly recommended.
Additional Information
Datasheet
Samples
Resources