Fuse Mounting Accessories Page 195 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Axial Lead & Cartridge Fuses PICO ll > Very Fast-Acting Fuse > 251/253 Series Materials Encapsulated, Epoxy-Coated Body: Pure Tin-coated Copper wire leads Solderability MIL-STD-202, Method 208 Lead Pull Force MIL-STD-202, Method 211, Test Condition A (will withstand a 7lbs. axial pull test) Fuses To MIL SPEC For fuses to MIL-PRF-23419, FM10 change the series number from 251 to 253 Operating Temperature -55C to +125C (Consider re-rating) Product Characteristics Vibration MIL-STD-202, Method 201 (10-55 Hz); Method 204, Test Condition C (55-2000 Hz at 10 G's Peak) Shock MIL-STD-202, Method 213, Test Condition I (100 G's peak for 6 msecs.) Insulation Resistance (After Opening): MIL-STD-202, Method 302, Test Condition A (10,000 ohms minimum at 100 volts) Moisture Resistance MIL-STD-202, Method 106 Resistance to Soldering Heat Withstands 60 seconds above 200 O C and up to 260C, maximum Flammability Rating UL 94V-0 Dimensions Packaging Part Numbering System Packaging Option Packaging Specification Quantity & Packaging Code *T1: 52.4mm (2.062") Tape and Reel EIA 296 Please refer to available quantities above in "Part Numbering System" **T3: 73mm (2.874') Tape and Reel EIA 296 0251 xxxx N R T1 Lead Length Type of Packaging Quantity Current Rating Series The default lead length for Ammo pack and Loose pack is now T1 for 251 series, and remains T3 for 253 series, therefore: T1 = 52.4mm (2.062"), 251 series only* Blank = 52.4mm (2.062") for 251 series* or 73mm (2.874") for 253 series** R = Reel A = Ammo Pack X = Loose Pack N = 5000 P = 2000 M = 1000 H = 100 Refer to Amp Code column of Electrical Specifications Table 251 = Standard type 253 = Military type Option Codes L L = RoHS + HF (Only applies to 251 Series) The default lead length for both ammo pack and loose pack is T1 for 251 and is T3 for 253. Notes: * T1 dimension is defined as the length of the component between the two tapes. The full component length is 62.7mm (2.468"). T1 length is for 251 series only. ** T3 dimension is defined as the length of the component between the two tapes. The full component length is 83.3.7mm (3.28"). T3 length is for 253 series only. Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 15 amp Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp 2.61 (.103") MAX 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape 38.1 (1.5") 38.1 (1.5") 7.11 (.280") 83.31 (3.28") 253 Series Markings (T3 lead length) L 1 A L 1 A 73.0 (2.874")** L 1 A F L 1 A 27.78 (1.094") 27.78 (1.094") 7.11 (.280") 62.7 (2.468") 52.4 (2.062")* 2.80 (.11") MAX 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape 251 Series (Halogen-free Version) Markings (T1 lead length) Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp F L 1 A F L 1 A 27.78 (1.094") 27.78 (1.094") 7.11 (.280") 62.7 (2.468") 52.4 (2.062")* 2.80 (.11") MAX 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape 251 Series Markings (T1 lead length) F Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.

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