Radial Lead Fuses
MICRO™ > Very Fast-Acting > 272/273/274/278/279 Series
272/273/274/278/279 Series,
MICRO™ Very Fast-Acting Fuse
QPL
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
1/500 to 5A to suit a wide variety of design needs.
Features
Military grade available
High breaking capacity
Clear cover option to view
fuse element status
Agency Approvals
Applications
Agency
Agency File Number
Ampere Range
Available from very low
ampere of 2mA to 5A
Plug-in with short or long
leads option
E10480
LR 29862
2mA - 5A
2mA - 5A
2mA - 5A
Printed circuit boards
and similar equipment
Electrical Characteristics
% of Ampere
Rating
100%
200%
Ampere Rating
1/500–5
1/500–3/10
4/10-5
Electronic components
QPL
FM02
Opening Time
4 Hours,
Min.
5 Seconds,
Max.
2 Seconds,
Max.
Electrical Characteristics
Ampere
Rating
(A)
.002
.005
.010
.015
.031
.050
.062
.100
.125
.200
.250
.300
.400
.500
.600
.700
.750
.800
1.00
01.5
2.00
3.00
4.00
5.00
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/272.html, /273.html, /274.html,
/278.html or /279.html for current information.
Amp Code
(for all
above
series)
.002
.005
.010
.015
.031
.050
.062
.100
.125
.200
.250
.300
.400
.500
.600
.700
.750
.800
001.
01.5
002.
003.
004.
005.
Max
Voltage
Rating
(V)
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
Interrupting
Rating
10,000 amperes at
125 VAC/VDC.
Nominal
Cold
Resistance
(Ohms)
2200
280
80.0
44.0
16.0
3.20
2.32
1.25
1.0
2.30
1.75
1.25
0.227
0.167
0.430
0.324
0.293
0.271
0.0880
0.0578
0.0425
0.0275
0.0202
0.0156
Nominal
Melting
I
2
t (A
2
sec)
0.00000000845
0.00000000810
0.000000462
0.00000123
0.00000810
0.0000666
0.000115
0.000385
0.000691
0.00409
0.00640
0.00945
0.0251
0.0716
0.0411
0.0710
0.0900
0.113
0.0648
0.160
0.300
0.759
1.38
2.21
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Agency Approvals
QPL
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
131
Revised: January 7, 2009
272/273/274/278/279 Series
272-4/278-9
LITTELFUSE [ LITTELFUSE ]
