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Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series 312/318 Series PS E Lead-Free 3AG, Fast-Acting Fuse Description The 3AG Fast-Acting Fuse solves a broad range of application requirements while offering reliable performance and cost-effective circuit protection. Features t
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Lead-free (except 10mA and 31mA rated items) Agency Approvals Agency File Number Ampere Range E10480 312 Series: 10mA - 10A/ 318 Series: 31mA - 10A 312 Series: 12A - 30A AU1410 PS E LR 29862 312 Series: 10mA - 30A 318 Series: 31mA - 10A NBK040205E10480B/F 312/318 Series: 1A - 10A E10480 318 Series: 12A - 30A SU050015005/5006/6005/6008 312/318 Series: 1A/ 1.25A / 1.6A/ 2A - 10A Applications Used as supplementary protection in appliance or utilization equipment to provide individual protection for components or internal circuits. Electrical Characteristics for Series % of Ampere Rating Ampere Rating Opening Time 100% 10mA – 35A 4 hours, Minimum 135% 10mA – 35A 1 hour, Maximum 200% 312 Series: 10mA - 10A 318 Series: 31mA - 10A © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/312.html or /318.html for current information. 313 Revised: September 10, 2010 10mA – 10A 5 sec., Maximum 12A – 30A 10 sec., Maximum 35A 20 sec., Maximum 312/318 Series 312/318 Series Agency Introduction to & Circuit Protection Axial Lead Cartridge Fuses 3AG > Fast Acting > Transientology 312/318 Series Electrical Characteristic Specifications by Item Agency Approvals Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2 sec) 250 177.4000 NA x x x** 250 23.6500 0.0000300 x x x Amp Code Ampere Rating (A) Voltage Rating (V) .10* 0.01 .031* 0.031 Interrupting Rating PS E .062 0.062 250 24.7000 0.000249 x x x .100 0.1 250 11.2800 0.00102 x x x .125 0.125 250 7.1450 0.00289 x x x .150 0.15 250 5.1300 0.00550 x x x .175 0.175 250 3.8750 0.00960 x x x .187 0.187 250 3.4200 0.0128 x x x .200 0.2 250 .250 0.25 250 35A@250Vac 10KA@125Vac 3.0200 0.0165 x x x 2.0100 0.0355 x x x .300 0.3 250 1.4050 0.0689 x x x .375 0.375 250 0.8250 0.185 x x x .500 0.5 250 0.4980 0.483 x x x .600 .6 250 0.3620 0.880 x x x .750 0.75 250 0.2445 1.84 x x x 001. 1 250 0.1900 0.760 x x x x x 1.25 1.25 250 0.1385 1.45 x x x x x x x x x x x x 01.5 1.5 250 0.1036 2.35 x 01.6 1.6 250 0.0934 2.80 x 1.75 1.75 250 01.8 1.8 250 0.0856 3.60 x x x x 0.0825 3.85 x x x x 002. 2 250 0.0704 5.20 x x x x 2.25 02.5 2.25 250 0.0594 7.20 x x x x x 2.5 250 0.0513 9.54 x x x x x 100A@250Vac 10KA@125Vac x 003. 3 250 0.0427 14.0 x x x x x 004. 4 250 0.0293 28.5 x x x x x 005. 5 250 0.0224 50.0 x x x x x 006. 6 250 0.0178 118.0 x x x x x 007. 7 250 0.0146 118.0 x x x x x 008. 8 250 0.0122 166.0 x x x x x 010. x x x x 200A@250Vac 10KA@125Vac 10 250 0.0093 298.0 x * 12 32 0.0072 234.6 015.* 15 32 0.0052 490.5 * 020. 20 32 0.0035 025.* 25 32 0.0024 030. 30 32 0.0019 3717 035. 35 32 0.0013 7531 012. * 300A@32 Vac x ** x x x x** x 1029 x x ** x 2041 x x** x x x x ** NOTES: 
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1C ** For 318 Series 12A to 30A, the agency approval is only cURus. 312/318 Series 314 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/312.html or /318.html for current information. Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series .250 A .375 A .500 A .750 A 1A 1.5 A 2A 2.5 A 3A 4A 5A 6A 7A 8A 10 A .125 A 1000 .062 A Average Time Current Curves .031 A Temperature Rerating Curve TIME IN SECONDS 100 10 1 0.1 0.01 0.005 0.01 1 0.1 CURRENT IN AMPERES 10 100 1MFBTF
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ratings which are not published. Recommended Process Parameters: 280 260 Wave Parameter 240 220 200 Preheat: 180 (Depends on Flux Activation Temperature) Temperature Minimum: 160 140 120 100 80 60 40 Lead-Free Recommendation 5ZQJDBM
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Test Condition B Part Numbering System Measurements displayed in millimeters (inches) 0312 xxxx M X P 312 Series Series 6.35 (.25") Amp Code Refer to Amp Code column of Electrical Characteristics Table 31.75 (1.25") Quantity Code M = 1000 318 Series Packaging Code 0.813 (.032") X = Filler 6.985 (.275") Lead-free 32.72 (1.288") Axial Lead Material: Tin Coated Copper 39.68 (1.56") 5:1. Standard Length 12.70 (0.50”) 5:1 Short Lead Option Packaging Packaging Specification Quantity Quantity & Packaging Code Taping Width Bulk N/A 1000 MX N/A Bulk N/A 100 )9 N/A Bulk N/A 1000 MX N/A Bulk N/A 100 )9 N/A Bulk N/A 1000 MXB N/A Packaging Option 312 Series 318 Series 312/318 Series 316 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/312.html or /318.html for current information.