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Axial Lead and Cartridge Fuses
Subminiature
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MICRO FUSE
Very Fast-Acting Type 272/273/274/278/279 Series
® ® QPL
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
5 amperes to suit a wide variety of design needs.
ELECTRICAL CHARACTERISTICS:
% of Ampere
Rating
Ampere
Rating
100%
1/500 5
200%
1/500 3/10
4/10 5
Opening
Time
4 hours, Minimum
5 seconds, Maximum
2 seconds, Maximum
AGENCY APPROVALS: Recognized under the Components Program
of Underwriters Laboratories and Certified by CSA.
AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.
INTERRUPTING RATING: 10,000 amperes at 125 VAC/VDC.
FUSES TO MIL SPEC: 273 Series is available in Military QPL type
(FM02). To order, change 273 to 274.
Operating Temperature:
273 and 279: 55°C to 85°C.
272 and 278: 55°C to 125°C
PATENTED
ORDERING INFORMATION:
Plug-In
Radial Lead
Catalog Catalog Catalog Catalog
Number Number Number Number
272.002 273.002 278.002 279.002
272.005 273.005 278.005 279.005
272.010 273.010 278.010 279.010
272.015 273.015 278.015 279.015
272.031 273.031 278.031 279.031
272.050 273.050 278.050 279.050
272.062 273.062 278.062 279.062
272.100 273.100 278.100 279.100
272.125 273.125 278.125 279.125
272.200 273.200 278.200 279.200
272.250 273.250 278.250 279.250
272.300 273.300 278.300 279.300
272.400 273.400 278.400 279.400
272.500 273.500 278.500 279.500
272.600 273.600 278.600 279.600
272.700 273.700 278.700 279.700
272.750 273.750 278.750 279.750
272.800 273.800 278.800 279.800
272 001 273 001 278 001 279 001
272 01.5 273 01.5 278 01.5 279 01.5
272 002 273 002 278 002 279 002
272 003 273 003 278 003 279 003
272 004 273 004 278 004 279 004
272 005 273 005 278 005 279 005
Ampere
Rating
1/500
1/200
1/100
1/64
1/32
1/20
1/16
1/10
1/8
2/10
1/4
3/10
4/10
1/2
6/10
7/10
3/4
8/10
1
11/2
2
3
4
5
Voltage
Rating
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
Nominal
Resistance
Cold Ohms
2200
280 0.
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 I2t
A2 Sec.
0.00000000845
0.0000000810
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
272 000 Series
5.97
(.235")
7.30
(.29") 4.32
(.17")
273 000 Series
6.35
(.25")
8.89
(.35") 4.32
(.17")
2.54 (.10")
2.54 (.10")
5.97
(.235")
278 000 Series
7.30
(.29")
25.4 (1.0")
2.54 (.10")
6.35
(.25")
279 000 Series
8.89
(.35")
25.4 (1.0")
2.54 (.10")
NOTE: Amperage and voltage rating stamped on cap. Leads are solder-coated
copper; .025" diameter.
Average Time Current Curves
100
10
1
0.1
0.01
0.001
0.005 0.01
0.1 1
10
CURRENT IN AMPERES
100
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