153
Cartridge and Axial Lead Fuses
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Revised: July 16, 2008
3AG > Fast Acting > 312/318 Series
312/318 Series
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/312.html or 318.html for current information.
312/318 Series Lead-Free 3AG, Fast-Acting Fuse
The 3AG Fast-Acting Fuse solves a broad range
of application requirements while offering reliable
performance and cost-effective circuit protection.
Agency Approvals
Agency Agency File Number Ampere Range
®
UL
E10480
AU1410
312 Series 10mA - 10A/
318 Series 31mA - 10A
312 Series 12A - 30A
®
LR 29862 312 Series 10mA - 30A
318 Series 31mA - 10A
PS
E
NBK040205-
E10480B/F 312/318 Series 1A - 10A
E10480 318 Series 12A - 30A
SU05001-
5005/5006/6005/6008
312/318 Series
1A/ 1.25A / 1.6A/
2A - 10A
312 Series 10mA - 10A
318 Series 31mA - 35A
Features
Electrical Characteristics for Series
Applications
®
UL
% of Ampere
Rating Ampere Rating Opening Time
100% .01 – 35 4 hours, Minimum
135% .01 – 35 1 hour, Maximum
200%
.01 – 10 5 sec., Maximum
12 – 30 10 sec., Maximum
35 20 sec., Maximum
RoHS Pb
t *OBDDPSEBODFXJUI6-
Standard 248-14
t "WBJMBCMFJODBSUSJEHF
and axial lead format
and with various forming
dimensions
t 3P)4DPNQMJBOUBOE
Lead-free (except 10mA
and 31mA rated items)
Used as supplementary protection in appliance or
utilization equipment to provide individual protection for
components or internal circuits.
®
PS
E
Description
154
Cartridge and Axial Lead Fuses
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Revised: July 16, 2008
3AG > Fast Acting > 312/318 Series
312/318 Series
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/312.html or 318.html for current information.
Amp
Code
Ampere
Rating (A)
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2 sec)
Agency Approvals
®
ULPS
E
®
.10*0.01 250
10mA ~ 1A
35A@250Vac
10KA@125Vac
177.4000 NA x** x** x**
.031*0.031 250 23.6500 0.0000300 x x x
.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 3.0200 0.0165 x x x
.250 0.25 250 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
1.25A ~ 3A
100A@250Vac
10KA@125Vac
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
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
4A ~ 10A
200A@250Vac
10KA@125Vac
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 10 250 0.0093 298.0 x x x x x
012 12 32
12A ~ 35A
300A@32 Vac
0.0072 234.6 x** x*** x**
015 15 32 0.0052 490.5 x** x*** x**
020 20 32 0.0035 1029 x** x*** x**
025 25 32 0.0024 2041 x** x*** x**
030 30 32 0.0019 3717 x** x*** x**
035 35 32 0.0013 7531
NOTES:
N"BOEN"BSFOPU3P)4DPNQPMBJOUBTUIFHMBTTCFBEDPOUBJOT1C
** 312 Series only. Refer to Agency Approvals section of this document.
*** 318 Series only. Refer to Agency Approvals section of this document.
Electrical Characteristic Specifications by Item
155
Cartridge and Axial Lead Fuses
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Revised: July 16, 2008
3AG > Fast Acting > 312/318 Series
312/318 Series
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/312.html or 318.html for current information.
Average Time Current Curves
1000
100
10
1
0.1
0.01
110 100
0.01 0.1
.031 A
.062 A
.125 A
.250 A
.375 A
.500 A
.750 A
1 A
1.5 A
2 A
2.5 A
3 A
4 A
5 A
6 A
7 A
8 A
10 A
0.005
TIME IN SECONDS
CURRENT IN AMPERES
Temperature Rerating Curve
Soldering Parameters - Wave Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
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)
Temperature (°C) - Measured on bottom side of board
Cooling Time
Preheat Time
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature) 5ZQJDBM*OEVTUSZ3FDPNNFOEBUJPO
Temperature Minimum: 100° C
Temperature Maximum: 150° C
1SFIFBU5JNF 60-180 seconds
Solder Pot Temperature: 280° C Maximum
Solder Dwell Time: 2-5 seconds
Recommended Hand-Solder Parameters:
4PMEFS*SPO5FNQFSBUVSF¡$¡$
)FBUJOH5JNFTFDPOETNBY
Note: These devices are not recommended for IR or
Convection Reflow process.
Recommended Process Parameters:
156
Cartridge and Axial Lead Fuses
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Revised: July 16, 2008
3AG > Fast Acting > 312/318 Series
312/318 Series
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/312.html or 318.html for current information.
312 Series
318 Series
6.35
(.25")
32.72
(1.288")
31.75
(1.25")
6.985
(.275")
0.813
(.032")
39.68
(1.56") 5:1.
Standard Length
12.70
(0.50”) 5:1
Short Lead Option
Axial Lead Material:
Tin Coated Copper
Product Characteristics
Dimensions
Packaging
Packaging Option Quantity Quantity &
Packaging Code
312 Series (Cartridge Type)
Bulk 5 VX
Bulk 100 )9
Bulk 1000 MX
Bulk 1000 MXCC
Bulk 100 )9$$
318 Series (Axial Leaded)
Bulk 5 VX
Bulk 100 )9
Bulk 1000 MX
Bulk 1000 MXSL
Materials
Body: Glass
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Terminal Strength .*-45%(.FUIPE"
Test Condition A
Solderability 3FGFSFODF*&$4FDPOE&EJUJPO
2003-01 Annex A
Product Marking
Cap1: Brand logo, current and voltage
ratings
Cap2: Series and agency approval
marks
Operating
Temperature o$UP$
Thermal
Shock
.*-45%(.FUIPE(5FTU$POEJUJPO#
DZDMFT¡$UP¡$
Vibration .*-45%(.FUIPE"
Humidity
.*-45%(.FUIPE#
5FTU$POEJUJPO")JHI3)
and Elevated temperature (40°C) for 240 hours
Salt Spray .*-45%(.FUIPE%
Test Condition B
Part Numbering System
0312 xxxx M X CC
Quantity Code
Current Rating Code
Series
Refer to Amp Code column of
Electrical Characteristics Table
Option Codes
Packaging Code
X = Loose Pack
M = 1000
H = 100
V = 5
312 = Cartridge
318 = Axial Leaded
Blank = Standard Item
CC = Color Coded
SL = Short Lead Option (12.70 +/- 1.575 mm)
P = RoHS Compliant and Lead Free Indicator *
For additional information or information about
other available options, please contact Littelfuse.
*Note: All 312 / 318 series fuses are now sold
as RoHS compliant and Lead Free by default,
with or without the “P” indicator.
Measurements displayed in millimeters (inches)