0312.300HXP

Fuse, Cartridge, Fast Acting, 300 mA, 250 V, 6.3mm x 32mm, 1/4" x 1-1/4", 312

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Manufacturer: LITTELFUSE
Product type: Cartridge Fuses
Blow Characteristic:Fast Acting; Fuse Current:300mA; Voltage Rating VAC:250V; Fuse Size Metric:6.3mm x 32mm; Fuse Size Imperial:1/4" x 1-1/4"; Product Range:312 Series; Breaking C
SVHC: To Be Advised
Fuse Current: 300mA
Product Range: 312
Fuse Size Metric: 6.3mm x 32mm
Fuse Size Imperial: 1/4" x 1-1/4"
Voltage Rating VAC: 250V
Blow Characteristic: Fast Acting
Breaking Capacity Current AC: 35A

Delivery and price
Units per pack	100
Price	1.61 €
Current stock	10+
Lead time	30 days

Datasheet

**Axial Lead & Cartridge Fuses** 3AG > Fast Acting > 312/318 Series 

## 312/318 Series Lead-Free 3AG, Fast- ~~Acting Fuse~~ 

## ~~**RoHS**~~ **Pb PSE** ~~[_|O[@cSAdus > @ Du G CE~~ 

**Description** The 312 and 318 Series are 3AG Fast-Acting fuses that ~~Lo~~ 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 

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Agency Approvals Applications<br>Te ee<br>Used as supplementary protection in appliance or<br>Agency Agency File Number Ampere Range<br>re utilization equipment to provide individual protection for<br>0.062 - 10A components or internal circuits.<br>E10480<br>om On po 12A-25A<br>312 Series: 0.062A - 30A<br>¢ 29862 318 Series: 0.062A - 10A Po Electrical Characteristics for Series<br>(312 Series)<br>1A - 5A<br>NBK060618-E10480A 6A - 10A % of Ampere Rating Ampere Rating Opening Time<br>NBK060618-E10480C<br>9 PSE  4)  (318 Series) OO 100% 0.062A – 35A 4 hours, Minimum<br>NBK060618-E10480B 1A - 5A  135% 0.062A – 35A 1 hour, Maximum<br>6A - 10A<br>NBK060618-E10480D a 0.062A – 10A 5 sec., Maximum<br>E10480 318 Series: 12A - 30A 200% 12A – 30A 10 sec., Maximum<br>SU05001-6008 1A - 2A 35A 20 sec., Maximum<br>ie SU05001-5005 3A - 6A<br>SU05001-5006 7A - 10A<br>——— N/A 0.062A - 10A Additional Information<br>**----- End of picture text -----**<br>


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Datasheet Resources Samples Accessories<br>312 Series 312 Series 312 Series 312 & 318 Series<br><<br>Datasheet Resources Samples<br>318 Series 318 Series 318 Series<br>**----- End of picture text -----**<br>


For recommended fuse accessories for this product series, see ‘Recommended Accessories’ section. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/14/20 

**Axial Lead & Cartridge Fuses** 3AG > Fast Acting > 312/318 Series 

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Electrical Characteristic Specifcations by Item<br>Agency Approvals<br>Voltage  Nominal Cold  Nominal<br>CodeAmp  Rating (A)Ampere  Rating (V) InterruptingRating Resistance (Ohms) I [2] Melting t (A [2]  sec) PSE<br>.062 0.062 250 24.7 0.000249 x - - - x x<br>.100 0.1 250 11.28 0.00171 x - - - x x<br>.125 0.125 250 7.145 0.00289 x - - - x x<br>.150 0.15 250 5.13 0.00550 x - - - x x<br>.175 0.175 250 3.875 0.00960 x - - - x x<br>.187 0.187 250 3.42 0.0128 x - - - x x<br>.200 0.2 250 35A@250Vac 3.02 0.0165 x - - - x x<br>.250 0.25 250 10KA@125Vac 2.01 0.0355 x - - - x x<br>.300 0.3 250 1.405 0.0689 x - - - x x<br>.375 0.375 250 0.825 0.185 x - - - x x<br>.500 0.5 250 0.498 0.483 x - - - x x<br>.600 0.6 250 0.362 0.88 x - - - x x<br>.750 0.75 250 0.2445 1.84 x - - - x x<br>001. 1 250 0.19 0.76 x - x x x x<br>1.25 1.25 250 0.1385 1.45 x - x x x x<br>01.5 1.5 250 0.1036 2.35 x - - x x x<br>01.6 1.6 250 0.0934 2.8 x - x x x x<br>1.75 1.75 250 0.0856 3.6 x - - x x x<br>01.8 1.8 250 100A@250Vac 0.0825 3.85 x - - x x x<br>10KA@125Vac<br>002. 2 250 0.0704 5.2 x - x x x x<br>2.25 2.25 250 0.0594 7.2 x - x x x x<br>02.5 2.5 250 0.0513 9.54 x - x x x x<br>003. 3 250 0.0427 14.0 x - x x x x<br>004. 4 250 0.0293 28.5 x - x x x x<br>005. 5 250 0.0224 50.0 x - x x x x<br>006. 6 250 200A@250Vac 0.0178 118.0 x - x x x x<br>007. 7 250 10KA@125Vac 0.0146 81.0 x - x x x x<br>008. 8 250 0.0122 166.0 x - x x x x<br>010. 10 250 0.0093 298.0 x - x x x x<br>012. 12 32 0.0072 234.6 x [†] x [**] - - x [†] -<br>015. 15 32 0.0052 490.5 x [†] x [**] - - x [†] -<br>020. 20 32 300A@32 Vac 0.0035 1414 x [†] x [**] - - x [†] -<br>025. 25 32 0.0024 2041 x [†] x [**] - - x [†] -<br>030. 30 32 0.0019 3717 - x [**] - - x [†] -<br>035. 35 32 0.0013 7531 - - - - - -<br>**----- End of picture text -----**<br>


**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. 12/14/20 

**Axial Lead & Cartridge Fuses** 3AG > Fast Acting > 312/318 Series 

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## ~~**Average Time Current Curves**~~ 

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1000<br>100<br>10<br>1<br>0.1<br>0.01<br>0.005 0.01 0.1 1 10 100<br>Current (amps)<br>.062 A .125 A .250 A .375 A.500 A .750 A 1 A 1.5 A 2 A2.5 A3 A4 A5 A 6 A7 A 8 A 10 A<br>Time (seconds)<br>**----- End of picture text -----**<br>


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10000<br>1000<br>100<br>10<br>1<br>0,1<br>0,01<br>0,001<br>0,01 0,1 1 10 100 1000<br>Current (amps)<br>12A 15A 20A 25A30A35A<br>Time (seconds)<br>**----- End of picture text -----**<br>


***** Please contact Littelfuse for more details on those T-C Curves of other ampere ratings which are not published. 

## ~~**Temperature Re-rating Curve**~~ 

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**Note:** Rerating depicted in this curve is in addition to the industry practice derating of 25% for continuous operation. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/14/20 

**Axial Lead & Cartridge Fuses** 3AG > Fast Acting > 312/318 Series 

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## ~~**Soldering Parameters - Wave Soldering**~~ 

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300<br>280<br>260<br>240<br>220<br>200<br>180<br>160<br>140<br>120<br>100<br>80<br>60<br>40<br>20<br>0<br>Time (Seconds)<br>Preheat Time Cooling Time<br>Dwell Time<br>Temperature (°C) - Measured on bottom side of board 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<br>**----- End of picture text -----**<br>


## **Recommended Process Parameters:** 

||**Wave Parameter**<br>Preheat:<br>(Depends on Flux Activation Temperature)<br>Temperature Minimum:<br>Temperature Maximum:<br>Preheat Time:<br>Solder Pot Temperature:<br>Solder Dwell Time:<br>**Recommended Hand-Solder Parameters:**<br>Solder Iron Temperature: 350°C +/- 5°C<br>Heating Time: 5 seconds max.<br>**Note:**These devices are not recommended for|**Lead-Free Recommendation**<br>(Typical Industry Recommendation)<br>100°C<br>150°C<br>60-180 seconds<br>260°C Maximum<br>2-5 seconds<br>IR or Convection Refow process.|
|---|---|---|



## ~~**Product Characteristics**~~ 

||Body:  Glass|
|---|---|
|**Materials**<br>**Terminal Strength**<br>**Solderability**<br>**Product Marking**|Cap:    Nickel–plated brass<br>Leads: Tin–plated Copper<br>MIL-STD-202, Method 211,<br>Test Condition A<br>MIL-STD-202 method 208<br>Cap1:<br>Brand logo, current and voltage<br>ratings<br>Cap2:<br>Series and agency approval<br>marks|



## ~~**Dimensions**~~ 

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Measurements displayed in millimeters (inches)<br>312 000 Series 318 000 Series<br>(cartridge) (axial leaded)<br>6.35±0.3  6.985±0.3<br>(.25") (.275")<br>31.75±1.12 32.72±1.12<br>(1.25") (1.288")<br>0.81±0.05(.032") for (0.062A-15A) Axial Lead Length:<br>1.02±0.06(.040") for (20A-35A)<br>Standard Length:<br>Axial Lead Material:  38.1±3.15(1.50") TYP.<br>Tin-coated copper Short Lead Option:<br>12.7±2.0(.50") TYP.<br>**----- End of picture text -----**<br>


|**Operating Temperature**|–55ºC to +125ºC|
|---|---|
|**Thermal Shock**|MIL-STD-202, Method 107,  Test Condition B: (5<br>cycles -65°C to +125°C)|
|**Vibration**|MIL-STD-202, Method 201|
|**Humidity**|MIL-STD-202, Method 103,<br>Test Condition A: High RH (95%),<br>and Elevated temperature (40°C) for 240 hours|
|**Salt Spray**|MIL-STD-202, Method 101,<br>Test Condition B|



## ~~**Part Numbering System**~~ 

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0312 xxxx M X P<br>Series<br>312 = Cartridge<br>318 = Axial Leaded<br>Amp Code<br>Refer to Amp Code column of<br>Electrical Characteristics Table<br>Quantity Code<br>M = 1000<br>Packaging Code<br>X = Filler<br>Lead-free<br>**----- End of picture text -----**<br>


© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/14/20 

**Axial Lead & Cartridge Fuses** 3AG > Fast Acting > 312/318 Series 

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Packaging<br>Quantity &<br>Packaging Option Packaging Specification Quantity  Packaging Code Taping Width<br>312 Series<br>Bulk N/A 1000 MX N/A<br>Bulk N/A 100 HX N/A<br>318 Series<br>Bulk N/A 1000 MX N/A<br>Bulk N/A 100 HX N/A<br>Bulk N/A 1000 MXB N/A<br>Recommended Accessories<br>Accessory Type Series Description Max Application Voltage Max Application Amperage<br>155100 Twist-Lock In-Line Fuseholder 32 20<br>342 Traditional Panel Mount Fuseholder 250 20<br>Holder<br>346 Panel Mount Flip-Top Shock-Safe Fuseholder 250 15<br>345 Shock-Safe Fuseholder with PC Mount, Solder Mount and Panel Mount options 250 20<br>354 Low Profile OMNI-BLOK [®]  Fuse Block 30<br>Block 600<br>359 High Current Screw Terminal Fuse Block  30<br>122 High Current Traditional PC Board Fuse Clip 1000 30<br>Clip<br>101 Rivet/Eyelet Type Fuse Clip 1000 15<br>**----- End of picture text -----**<br>


## **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. 12/14/20

Updated at June 4, 2026

Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.

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