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Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
312/318 Series Lead-Free 3AG, Fast-Acting Fuse
PS
E
Description
The 3AG Fast-Acting Fuse solves a broad range
of application requirements while offering reliable
performance and cost-effective circuit protection.
Features
Agency Approvals
Agency Agency File Number Ampere Range
E10480
AU1410
LR 29862
PS
E
NBK040205-
E10480B/F
E10480 318 Series: 12A - 30A
SU05001-
5005/5006/6005/6008
312 Series: 62mA - 10A
318 Series: 62mA - 10A
312 Series: 12A - 30A
312 Series: 62mA - 30A
318 Series: 62mA - 10A
312/318 Series: 1A - 10A
312/318 Series:
1A/ 1.25A / 1.6A/
2A - 10A
312 Series: 62mA - 10A
318 Series: 62mA - 10A
• InaccordancewithUL
Standard 248-14
• RoHScompliantand
Lead-free
• Availableincartridge
and axial lead format
and with various forming
dimensions
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
100%
135%
200%
Ampere Rating Opening Time
62mA – 35A 4 hours, Minimum
62mA – 35A 1 hour, Maximum
10mA – 10A 5 sec., Maximum
12A – 30A 10 sec., Maximum
35A 20 sec., Maximum
Additional Information
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Datasheet
312 Series
Datasheet
318 Series
Resources
312 Series
Resources
318 Series
Samples
312 Series
Samples
318 Series
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Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Electrical Characteristic Specifications by Item
Amp
Code
Ampere
Rating (A)
Voltage
Rating
(V)
.062 0.062 250
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
Nominal
Melting
2
t (A2 sec)
I
24.7000 0.000249 x x x
Agency Approvals
PS
E
.10 0 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 3.0200 0.0165 x x x
.250 0.25 250 2 .0100 0.0355 x x x
35A@250Vac
10KA@125Vac
.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
0 01. 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
01. 5 1.5 250 0.1036 2.35 x x x x
01. 6 1.6 250 0.0934 2.80 x x x x x
1.75 1.75 250 0.0856 3.60 x x x x
01. 8 1.8 250 0.0825 3.85 x x x x
100A@250Vac
10KA@125Vac
002. 2 250 0.0704 5.20 x x x x x
2.25 2.25 250 0.0594 7.20 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 0.0178 118.0 x x x x x
0 0 7. 7 250 0.0146 118.0 x x x x x
200A@250Vac
10KA@125Vac
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.
015.
020.
025.
030.
*
12 32
*
15 32 0.0052 490.5 x x
*
20 32 0.0035 1029 x x
*
25 32 0.0024 2041 x x
*
30 32 0.0019 3717 x x
300A@32 Vac
0.0072 234.6 x x
**
**
**
**
**
x
x
x
x
x
035. 35 32 0.0013 7531
NOTES:
** For 318 Series 12A to 30A, the agency approval is only cURus.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
Revised: 12/19/13
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Axial Lead & Cartridge Fuses
300
240
Temperature (°C) - Measured on bottom side of board
3AG > Fast Acting > 312/318 Series
Temperature Rerating Curve
Average Time Current Curves
.062 A
.125 A
1000
100
10
TIME IN SECONDS
1
0.1
0.01
0.01
0.005
.250 A
0.1
CURRENT IN AMPERES
.375 A
2 A
.500 A
.750 A
1 A
1.5 A
2.5 A
3 A
4 A
5 A
7 A
6 A
8 A
10 A
1
10
100
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:
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
0
102030405060708090
Time (Seconds)
Preheat Time
100
110
120
130
140
150
160
170
180
190
200
210
220
230
Dwell Time
Cooling Time
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature)
Temperature Minimum:
Temperature Maximum:
(Typical Industry Recommendation)
100
° C
150
° C
Preheat Time: 60-180 seconds
Solder Pot Temperature:
260
° C Maximum
Solder Dwell Time: 2-5 seconds
Recommended Hand-Solder Parameters:
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
Note: These devices are not recommended for IR or
Convection Reflow process.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
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Product Characteristics
0312 MX Pxxxx
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Materials
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Body: Glass
Terminal Strength
Solderability
MIL-STD-202G, Method 211A,
Test Condition A
Reference IEC 60127 Second Edition
2003-01 Annex A
Cap1: Brand logo, current and voltage
Product Marking
ratings
Cap2: Series and agency approval
marks
Dimensions
Measurements displayed in millimeters (inches)
312 000 Series
(cartridge)
6.35±0.3
(.25")
31.75±1.12
(1.25")
Axial Lead Diameter:
0.81±0.05 (.032")
Axial Lead Material:
Tin-coated copper
318 000 Series
(axial leaded)
32.72±1.12
(1.288")
Axial Lead Length:
Standard Length:
39.68 (1.56") TYP.
Short Lead Option:
12.70 (0.50”) TYP
6.985±0.3
(.275")
Operating
Temperature
Thermal
Shock
–55ºC to +125ºC
MIL-STD-202G, Method 107G, Test Condition B:
(5 cycles -65°C to +125°C)
Vibration MIL-STD-202G, Method 201 A
MIL-STD-202G, Method 103B,
Humidity
Test Condition A: High RH (95%),
and Elevated temperature (40°C) for 240 hours
Salt Spray
MIL-STD-202G, Method 101D,
Test Condition B
Part Numbering System
Series
Amp Code
Refer to Amp Code column of
Electrical Characteristics Table
Quantity Code
M = 1000
Packaging Code
X = Filler
Lead-free
Packaging
Packaging Option Packaging Specification Quantity
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
Quantity &
Packaging Code
Taping Width
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
Revised: 12/19/13
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