Brochure

© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Radial Lead Fuses
MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 Series
272/273/274/278/279 Series, MICRO
™
Very Fast-Acting Fuse
Description
Developed originally for the U.S. Space Program,
MICRO™ fuse provides reliability in a compact design.
The MICRO™ fuse is available in plug–in or radial lead
styles and a complete range of ampere ratings from
0.002A to 5A to suit a wide variety of design needs.
Agency Approvals
Agency Agency File Number Ampere Range
E10480
0.002A - 5A
29862
0.002A - 5A
QPL
FM02
0.002A - 5A
Features
Electrical Characteristics
Applications
QPL
% of Ampere
Rating
Ampere Rating Opening Time
100%
0.002 – 5
4 Hours, Min.
200%
0.002 – 0.3
5 Seconds, Max.
0.4 - 5 2 Seconds, Max.
Ampere
Rating
(A)
Amp Code
(for all
above
series)
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
Nominal
Melting
I
2
t (A
2
sec)
Agency Approvals
QPL
.002 .002 125
10,000A@125VAC/VDC
2200 0.00000000845
X X X
.005 .005 125 280 0.0000000766
X X X
.010 .010 125 80.0 0.000000462
X X X
.015 .015 125 44.0 0.00000123
X X X
.031 .031 125 16.0 0.00000810
X X X
.050 .050 125 3.52 0.0000666
X X X
.062 .062 125 2.55 0.000115
X X X
.10 0 .100 125 1.38 0.000385
X X X
.125 .125 125 1. 0 0.000691
X X X
.200 .200 125 2.30 0.00409
X X X
.250 .250 125 1.75 0.00640
X X X
.300 .300 125 1.25 0.00945
X X X
.400 .400 125 0.227 0.0251
X X X
.500 .500 125 0.167 0.0716
X X X
.600 .600 125 0.430 0.0411
X X X
.700 .700 125 0.324 0.0710
X X X
.750 .750 125 0.293 0.0563
X X X
.800 .800 125 0.271 0.113
X X X
1. 0 0 0 01. 125 0.0880 0.0648
X X X
01. 5 01. 5 125 0.0578 0.160
X X X
2.00 002. 125 0.0425 0.300
X X X
3.00 003. 125 0.0275 0.759
X X X
*4.00 004. 125 0.0202 1.38
X X X
*5.00 005. 125 0.0156 2.21
X X X
Electrical Characteristics
• Military grade available
• High breaking capacity
• Clear cover option to view
fuse element status
• Available from very low
ampere of 0.002A to 5A
• Plug-in with short or long
leads option
• Printed circuit boards
and similar equipment
• Electronic components
Specifications are subject to change without notice. Application testing is strongly recommended.
* The fuses of 4A and 5A for 272 and 278 Series are obsolete.