subminiature axial lead and cartridge fuses micro fuse very fast-acting type 272/273/274/278/279 series 392 www.littelfuse.com 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 ampere opening rating rating time 100% 1/500 5 4 hours, min imum 200% 1/500 3/10 5 seconds, max imum 4/10 5 2 seconds, max imum 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 nominal nominal catalog catalog catalog catalog ampere voltage resistance melting i 2 t number number number number rating rating cold ohms a 2 sec. 272 .002 273 .002 278 .002 279 .002 1/500 125 2200 0.00000000845 272 .005 273 .005 278 .005 279 .005 1/200 125 280 0. 0.0000000810 272 .010 273 .010 278 .010 279 .010 1/100 125 80.0 0.000000462 272 .015 273 .015 278 .015 279 .015 1/64 125 44.0 0.00000123 272 .031 273 .031 278 .031 279 .031 1/32 125 16.0 0.00000810 272 .050 273 .050 278 .050 279 .050 1/20 125 3.20 0.0000666 272 .062 273 .062 278 .062 279 .062 1/16 125 2.32 0.000115 272 .100 273 .100 278 .100 279 .100 1/10 125 1.25 0.000385 272 .125 273 .125 278 .125 279 .125 1/8 125 1.0 0.000691 272 .200 273 .200 278 .200 279 .200 2/10 125 2.30 0.00409 272 .250 273 .250 278 .250 279 .250 1/4 125 1.75 0.00640 272 .300 273 .300 278 .300 279 .300 3/10 125 1.25 0.00945 272 .400 273 .400 278 .400 279 .400 4/10 125 0.227 0.0251 272 .500 273 .500 278 .500 279 .500 1/2 125 0.167 0.0716 272 .600 273 .600 278 .600 279 .600 6/10 125 0.430 0.0411 272 .700 273 .700 278 .700 279 .700 7/10 125 0.324 0.0710 272 .750 273 .750 278 .750 279 .750 3/4 125 0.293 0.0900 272 .800 273 .800 278 .800 279 .800 8/10 125 0.271 0.113 272 001 273 001 278 001 279 001 1 125 0.0880 0.0648 272 01.5 273 01.5 278 01.5 279 01.5 1 1 / 2 125 0.0578 0.160 272 002 273 002 278 002 279 002 2 125 0.0425 0.300 272 003 273 003 278 003 279 003 3 125 0.0275 0.759 272 004 273 004 278 004 279 004 4 125 0.0202 1.38 272 005 273 005 278 005 279 005 5 125 0.0156 2.21 100 10 1 0.1 0.01 0.001 1 10 100 0.01 0.1 0.005 1/64 a 1/100 a 1/200 a 1/32 a 1/16 a 1/8 a 1/4 a 1/2 a 3/4 a 1 a 1 1/2 a 2 a 3 a 4 a 5 a time in seconds current in amperes average time current curves 7.30 (.29") (.17") 8.89 (.35") 2.54 (.10") 7.30 (.29") 25.4 (1.0") 2.54 (.10") 25.4 (1.0") 2.54 (.10") 5.97 (.235") 6.35 (.25") 5.97 (.235") 2.54 (.10") 8.89 (.35") 6.35 (.25") 272 000 series 273 000 series 278 000 series 279 000 series note: amperage and voltage rating stamped on cap. leads are solder-coated copper; .025" diameter. (.17") 4.32 4.32 qpl
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