Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series 312/318 Series Lead-Free 3AG, Fast-Acting Fuse RoHS Pb PS E Description The 312 and 318 Series are 3AG Fast-Acting fuses that solve solves a broad range of application requirements while offering reliable performance and cost-effective circuit protection. Features • In accordance with UL • RoHS compliant and Standard 248-14 Lead-free • Available in cartridge and axial lead format and with various forming dimensions Agency Approvals Applications Used as supplementary protection in appliance or Agency Agency File Number Ampere Range utilization equipment to provide individual protection for 0.062 - 10A components or internal circuits. E10480 12A-25A 312 Series: 0.062A - 30A 29862 Electrical Characteristics for Series 318 Series: 0.062A - 10A (312 Series) 1A - 5A NBK060618-E10480A % of Ampere Rating Ampere Rating Opening Time 6A - 10A NBK060618-E10480C PS 100% 0.062A – 35A 4 hours, Minimum E (318 Series) NBK060618-E10480B 1A - 5A 135% 0.062A – 35A 1 hour, Maximum 6A - 10A NBK060618-E10480D 0.062A – 10A 5 sec., Maximum E10480 318 Series: 12A - 30A 200% 12A – 30A 10 sec., Maximum SU05001-6008 1A - 2A 35A 20 sec., Maximum SU05001-5005 3A - 6A SU05001-5006 7A - 10A N/A 0.062A - 10A Additional Information Datasheet Resources Samples Accessories 312 Series 312 Series 312 Series 312 & 318 Series Datasheet Resources Samples 318 Series 318 Series 318 Series For recommended fuse accessories for this product series, see ‘Recommended Accessories’ section. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/30/20

Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series Electrical Characteristic Specifications by Item Agency Approvals Voltage Nominal Cold Nominal Amp Ampere Interrupting Rating Resistance Melting Code Rating (A) Rating PS (V) (Ohms) I2t (A2 sec) E .062 0.062 250 24.7 0.000249 x - - - x x .100 0.1 250 11.28 0.00171 x - - - x x .125 0.125 250 7.145 0.00289 x - - - x x .150 0.15 250 5.13 0.00550 x - - - x x .175 0.175 250 3.875 0.00960 x - - - x x .187 0.187 250 3.42 0.0128 x - - - x x .200 0.2 250 35A@250Vac 3.02 0.0165 x - - - x x .250 0.25 250 10KA@125Vac 2.01 0.0355 x - - - x x .300 0.3 250 1.405 0.0689 x - - - x x .375 0.375 250 0.825 0.185 x - - - x x .500 0.5 250 0.498 0.483 x - - - x x .600 0.6 250 0.362 0.88 x - - - x x .750 0.75 250 0.2445 1.84 x - - - x x 001. 1 250 0.19 0.76 x - x x x x 1.25 1.25 250 0.1385 1.45 x - x x x x 01.5 1.5 250 0.1036 2.35 x - - x x x 01.6 1.6 250 0.0934 2.8 x - x x x x 1.75 1.75 250 0.0856 3.6 x - - x x x 100A@250Vac 01.8 1.8 250 0.0825 3.85 x - - x x x 10KA@125Vac 002. 2 250 0.0704 5.2 x - x x x x 2.25 2.25 250 0.0594 7.2 x - x x x x 02.5 2.5 250 0.0513 9.54 x - x x x 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 200A@250Vac 0.0178 118.0 x - x x x x 007. 7 250 10KA@125Vac 0.0146 81.0 x - x x x x 008. 8 250 0.0122 166.0 x - x x x x 010. 10 250 0.0093 298.0 x - x x x x 012. 12 32 0.0072 234.6 x† x** - - x† - 015. 15 32 0.0052 490.5 x† x** - - x† - 020. 20 32 300A@32 Vac 0.0035 1414 x† x** - - x† - 025. 25 32 0.0024 2041 x† x** - - x† - 030. 30 32 0.0019 3717 - x** - - x† - 035. 35 32 0.0013 7531 - - - - - - Notes: * - For 312 and 318 Series: Listed for the US and Canada (cULus) ** - For 318 Series (12A-25A) and 312 Series (30A only): Recognized for the US and Canada (cURus). † - For 312 series only. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/30/20

Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series Temperature Re-rating Curve Average Time Current Curves 10000 12A15A20A5A230A35A 1000 100 me (seconds) 10 Ti 1 0,1 0,01 0,001 Note: 0,01 0,1 1 10 100 1000 Rerating depicted in this curve is in addition to the industry practice derating of 25% for continuous operation. Current (amps) *Please contact Littelfuse for more details on those T-C Curves of other ampere ratings which are not published. Soldering Parameters - Wave Soldering Recommended Process Parameters: 300 280 Wave Parameter Lead-Free Recommendation 260 mperature (°C) - Measured on bottom side of board 11111222246802468024000000000000 ReP( SSSHD c roooe eoeTTPlllapdddmeehtreeieemmeemnrnrr ahgdI eppr tPDesoTn:eeio anwdmorr ttaaeTn e eTTettd :Fuueml i l5mlH rrmuTp eesaxeiee mp nrMMA:caedocte-runiatnS:airdxvetiosamiu:m l tm3drioue5euan0m:rxm ° T.PCe::a m+r/ap-me 5re°aCttue rres): (11622T0506-y5p00-01 i°°°sc8CCCae0lc IM onsdneaudcxsositmrnydu Rsmecommendation) Te 0 Note: These devices are not recommended for IR or Convection Reflow process. 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 Time (Seconds) Preheat Time Cooling Time Dwell Time © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/30/20

Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series Product Characteristics Body: Glass Operating Temperature –55ºC to +125ºC Materials Cap: Nickel–plated brass MIL-STD-202, Method 107, Test Condition B: (5 Leads: Tin–plated Copper Thermal Shock cycles -65°C to +125°C) MIL-STD-202, Method 211, Terminal Strength Vibration MIL-STD-202, Method 201 Test Condition A MIL-STD-202, Method 103, Solderability MIL-STD-202 method 208 Humidity Test Condition A: High RH (95%), Cap1: Brand logo, current and voltage and Elevated temperature (40°C) for 240 hours ratings Product Marking MIL-STD-202, Method 101, Cap2: Series and agency approval Salt Spray Test Condition B marks Dimensions Part Numbering System Measurements displayed in millimeters (inches) 0312 xxxx M X P 312 000 Series 318 000 Series (cartridge) (axial leaded) Series 312 = Cartridge 6.35±0.3 6.985±0.3 318 = Axial Leaded (.25") (.275") Amp Code 31.75±1.12 32.72±1.12 Refer to Amp Code column of (1.25") (1.288") Electrical Characteristics Table 0.81±0.05(.032") for (0.062A-15A) Axial Lead Length: Quantity Code 1.02±0.06(.040") for (20A-35A) M = 1000 Standard Length: Axial Lead Material: 38.1±3.15(1.50") TYP. Packaging Code X = Filler Tin-coated copper Short Lead Option: 12.7±2.0(.50") TYP. Lead-free Packaging Quantity & Packaging Option Packaging Specification Quantity Taping Width Packaging Code 312 Series Bulk N/A 1000 MX N/A Bulk N/A 100 HX N/A 318 Series Bulk N/A 1000 MX N/A Bulk N/A 100 HX N/A Bulk N/A 1000 MXB N/A © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/30/20

Axial Lead & Cartridge Fuses 3AG > Fast Acting > 312/318 Series Recommended Accessories Max Application Max Application Accessory Type Series Description Voltage Amperage 155100 Twist-Lock In-Line Fuseholder 32 20 342 Traditional Panel Mount Fuseholder 250 20 Holder 346 Panel Mount Flip-Top Shock-Safe Fuseholder 250 15 345 Shock-Safe Fuseholder with PC Mount, Solder Mount and Panel Mount options 250 20 354 Low Profile OMNI-BLOK® Fuse Block 30 Block 600 359 High Current Screw Terminal Fuse Block 30 122 High Current Traditional PC Board Fuse Clip 1000 30 Clip 101 Rivet/Eyelet Type Fuse Clip 1000 15 Notes: 1. Do not use in applications above rating. 2. Please refer to fuseholder data sheet for specific re-rating information. 3. Please contact factory for applications greater than the max voltage and amperage shown. 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: https://www.littelfuse.com/legal/disclaimers/product-disclaimer.aspx.. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/30/20