Radial Lead Fuses
MICRO™ > Very Fast-Acting > 272/273/274/278/279 Series
QPL
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
1/500 to 5A to suit a wide variety of design needs.
Features
tꢀ Military grade available
tꢀ High breaking capacity
tꢀ Available from very low
ampere of 2mA to 5A
tꢀ Plug-in with short or long
tꢀ Clear cover option to view
leads option
fuse element status
Agency Approvals
Applications
Agency
Agency File Number
Ampere Range
tꢀ Printed circuit boards
tꢀ Electronic components
E10480
LR 29862
FM02
2mA - 5A
and similar equipment
2mA - 5A
2mA - 5A
Electrical Characteristics
QPL
% of Ampere
Rating
Ampere Rating
1/500–5
OpeningTime
100%
4 Hours, Min.
5 Seconds, Max.
2 Seconds, Max.
1/500–3/10
4/10-5
200%
Electrical Characteristics
Amp Code
Ampere
Rating
(A)
Max
Nominal
Agency Approvals
Nominal
Melting
(for all
above
series)
.002
.005
.010
Voltage
Rating
(V)
Interrupting
Rating
Cold
Resistance
(Ohms)
2200
I2t (A2 sec)
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
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
.002
.005
.010
.015
.031
.050
.062
.100
.125
.200
.250
.300
.400
.500
.600
.700
.750
.800
1.00
01.5
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
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
280
80.0
44.0
16.0
3.20
2.32
1.25
1.0
.015
.031
.050
.062
.100
.125
.200
.250
.300
.400
.500
.600
.700
.750
.800
001.
2.30
1.75
1.25
10,000 amperes at
125 VAC/VDC.
0.227
0.167
0.430
0.324
0.293
0.271
0.0880
0.0578
0.0425
0.0275
0.0202
0.0156
0.0716
0.0411
0.0710
0.0900
0.113
0.0648
0.160
0.300
01.5
2.00
3.00
4.00
5.00
002.
003.
004.
005.
0.759
1.38
2.21
© 2009 Littelfuse, Inc.
272/273/274/278/279 Series
131
Revised: January 7, 2009
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.