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Axial Lead and Cartridge Fuses
Subminiature
MICRO
™
FUSE
Very Fast-Acting Type 272/273/274/278/279 Series
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.
®
®
QPL
ELECTRICAL CHARACTERISTICS:
% of Ampere
Rating
100%
200%
Ampere
Rating
1/500 –5
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.
272
000
Series
5.97
(.235")
7.30
(.29")
4.32
(.17")
273
000
Series
6.35
(.25")
8.89
(.35")
(.17")
4.32
2.54 (.10")
2.54 (.10")
Operating Temperature:
273 and 279: –55°C to 85°C.
272 and 278: –55°C to 125°C
278
000
Series
5.97
(.235")
7.30
(.29")
25.4 (1.0")
2.54 (.10")
PATENTED
ORDERING INFORMATION:
Plug-In
Catalog
Number
272.002
272.005
272.010
272.015
272.031
272.050
272.062
272.100
272.125
272.200
272.250
272.300
272.400
272.500
272.600
272.700
272.750
272.800
272
001
272
01.5
272
002
272
003
272
004
272
005
Catalog
Number
273.002
273.005
273.010
273.015
273.031
273.050
273.062
273.100
273.125
273.200
273.250
273.300
273.400
273.500
273.600
273.700
273.750
273.800
273
001
273
01.5
273
002
273
003
273
004
273
005
Radial Lead
Catalog
Number
278.002
278.005
278.010
278.015
278.031
278.050
278.062
278.100
278.125
278.200
278.250
278.300
278.400
278.500
278.600
278.700
278.750
278.800
278
001
278
01.5
278
002
278
003
278
004
278
005
Catalog Ampere
Number Rating
279.002
1/500
279.005
1/200
279.010
1/100
279.015
1/64
279.031
1/32
279.050
1/20
279.062
1/16
279.100
1/10
279.125
1/8
279.200
2/10
279.250
1/4
279.300
3/10
279.400
4/10
279.500
1/2
279.600
6/10
279.700
7/10
279.750
3/4
279.800
8/10
279
001
1
279
01.5
1
1
/
2
279
002
2
279
003
3
279
004
4
279
005
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 I
2
t
A
2
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
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
1/200 A
1/100 A
1/64 A
1/2 A
3/4 A
1A
1 1/2 A
2A
3A
4A
5A
1/32 A
1/16 A
1/8 A
1/4 A
100
10
TIME IN SECONDS
1
0.1
0.01
0.001
0.005
0.01
1
0.1
CURRENT IN AMPERES
10
100
286
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