272 LITTELFUSE | Alldatasheet
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Axial Lead and Cartridge Fuses MICRO™ FUSEVery Fast-Acting Type 272/273/274/278/279 Series 286 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, Minimum 200% 1/500–3/10 5 seconds, Maximum 4/10–5 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 Nominal Nominal Catalog Catalog Catalog Catalog Ampere Voltage Resistance Melting I 2t Number Number Number Number Rating Rating Cold Ohms A 2 Sec. 272 001 273 001 278 001 279 001 1 125 0.0880 0.0648 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 0.1 0.01 0.001 1 10 1000.01 0.10.005 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®