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Axial Lead & Cartridge Fuses PICO® ll > Very Fast-Acting > 491 Series 491 Series, PS E PICO® II, Very Fast-Acting Fuse Description The PICO® II Very Fast-Acting Fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. Features t
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BTTJTUBODF © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for current information. Revised: March 11, 2009 491 Series EC3051v1E-0902-CUST 491 Series Ampere Rating (A) Introduction to & Circuit Protection Axial Lead Cartridge Fuses Transientology PICO® ll > Very Fast-Acting > 491 Series Average Time Current Curves .125A .2A .25A .315A .375A .4A .5A .63A .75A .8A 1A 1.25A 1.5A 1.6A 2A 2.5A 3A 3.15A 3.5A 4A 5A Temperature Rerating Curve 1000 TIME IN SECONDS 100 10 1 Note: 
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7o Part Numbering System Dimensions 0491 xxxx N R T1 HF 491 Series (RoHS Version) Markings 7.11 (.280") LF LF Current Rating Refer to Amp Code column of Electrical Characteristics Table 0.5 2.80 (.11") MAX 5.0 (.197") 6.35 (.25") tape Series 27.78 (1.094") Quantity 6.35 (.25") tape N = 5000 M = 1000 0.5 Wire Diameter: 0.64 (.025") Type of Packaging R = Reel A = Ammo Pack 491 Series (RoHS and Halogen-free Version) Markings 27.78 (1.094") (T1 lead length) 62.7 (2.468") 52.4 (2.062")* 7.11 (.280") 0.5 LF 5.0 (.197") 6.35 (.25") tape 0.5 Lead Length The default lead length for Ammo pack and Loose pack is now T1 T1 = 52.4mm (2.062”) 27.78 (1.094") 2.80 (.11") MAX Option Codes Blank = RoHS HF = RoHS and Halogen-free 6.35 (.25") tape LF Wire Diameter: 0.64 (.025") Packaging Packaging Option 5
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  © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for current information. Revised: March 11, 2009 491 Series EC3051v1E-0902-CUST 491 Series 27.78 (1.094") (T1 lead length) 62.7 (2.468") 52.4 (2.062")* Introduction to Circuit Protection Transientology © 2009 Littelfuse, Inc. Revised: March 11, 2009 Specifications are subject to change without notice.