Cartridge and Axial Lead Fuses
3AG > Fast Acting > 312/318 Series
RoHS
Pb
312/318 Series
Lead-Free 3AG, Fast-Acting Fuse
PS
E
UL
®
®
Description
The 3AG Fast-Acting Fuse solves a broad range
of application requirements while offering reliable
performance and cost-effective circuit protection.
Features
Standard 248-14
and axial lead format
and with various forming
dimensions
Agency Approvals
Applications
Agency
Agency File Number
Ampere Range
Lead-free (except 10mA
and 31mA rated items)
UL
®
E10480
AU1410
®
312 Series 10mA - 10A/
318 Series 31mA - 10A
312 Series 12A - 30A
312 Series 10mA - 30A
318 Series 31mA - 10A
312/318 Series 1A - 10A
318 Series 12A - 30A
312/318 Series
1A/ 1.25A / 1.6A/
2A - 10A
312 Series 10mA - 10A
318 Series 31mA - 35A
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%
Ampere Rating
.01 – 35
.01 – 35
.01 – 10
200%
12 – 30
35
Opening Time
4 hours, Minimum
1 hour, Maximum
5 sec., Maximum
10 sec., Maximum
20 sec., Maximum
LR 29862
NBK040205-
E10480B/F
E10480
SU05001-
5005/5006/6005/6008
PS
E
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
http://www.littelfuse.com/series/312.html or
Please refer to www.littelfuse.com for current information. 318.html for current information.
153
Revised: July 16, 2008
312/318 Series
Cartridge and Axial Lead Fuses
3AG > Fast Acting > 312/318 Series
Electrical Characteristic Specifications by Item
Amp
Code
.10
*
.031
*
.062
.100
.125
.150
.175
.187
.200
.250
.300
.375
.500
.600
.750
001
1.25
01.5
01.6
1.75
01.8
002
2.25
02.5
003
004
005
006
007
008
010
012
015
020
025
030
035
NOTES:
** 312 Series only. Refer to Agency Approvals section of this document.
*** 318 Series only. Refer to Agency Approvals section of this document.
Ampere
Rating (A)
0.01
0.031
0.062
0.1
0.125
0.15
0.175
0.187
0.2
0.25
0.3
0.375
0.5
.6
0.75
1
1.25
1.5
1.6
1.75
1.8
2
2.25
2.5
3
4
5
6
7
8
10
12
15
20
25
30
35
Max
Voltage
Rating
(V)
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
32
32
32
32
32
32
12A ~ 35A
300A@32 Vac
4A ~ 10A
200A@250Vac
10KA@125Vac
1.25A ~ 3A
100A@250Vac
10KA@125Vac
10mA ~ 1A
35A@250Vac
10KA@125Vac
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
177
.4000
23.6500
24.7000
11.2800
7
.1450
5.1300
3.8750
3.4200
3.0200
2.0100
1.4050
0.8250
0.4980
0.3620
0.2445
0.1900
0.1385
0.1036
0.0934
0.0856
0.0825
0.0704
0.0594
0.0513
0.0427
0.0293
0.0224
0.0178
0.0146
0.0122
0.0093
0.0072
0.0052
0.0035
0.0024
0.0019
0.0013
Nominal
Melting
I
2
t (A
2
sec)
NA
0.0000300
0.000249
0.00102
0.00289
0.00550
0.00960
0.0128
0.0165
0.0355
0.0689
0.185
0.483
0.880
1.84
0.760
1.45
2.35
2.80
3.60
3.85
5.20
7
.20
9.54
14.0
28.5
50.0
118.0
118.0
166.0
298.0
234.6
490.5
1029
2041
3717
7531
Agency Approvals
UL
®
PS
E
®
x
**
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
**
x
**
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
***
x
**
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
**
x
x
x
x
x
x
x
x
x
x
x
**
x
**
x
**
x
**
x
***
x
***
x
***
x
***
x
**
x
**
x
**
x
**
312/318 Series
154
Revised: July 16, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/312.html or 318.html for current information.
Please refer to www.littelfuse.com
Cartridge and Axial Lead Fuses
3AG > Fast Acting > 312/318 Series
Temperature Rerating Curve
Average Time Current Curves
.031 A
.062 A
.125 A
1000
100
TIME IN SECONDS
10
1
0.1
0.01
0.005 0.01
.250 A
.375 A
.500 A
.750 A
1A
1.5 A
2A
2.5 A
3A
4A
5A
6A
7A
8A
10 A
10
100
1
0.1
CURRENT IN AMPERES
Soldering Parameters - Wave Soldering
300
Temperature
(°C) - Measured on bottom side of board
280
260
240
220
200
180
160
140
120
100
80
60
40
20
100
110
120
130
160
170
180
190
200
210
220
230
140
150
240
10
20
30
40
50
60
70
80
90
0
0
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
Lead-Free Recommendation
Temperature Minimum:
Temperature Maximum:
Solder Pot Temperature:
Solder Dwell Time:
100
°
C
150
°
C
60-180 seconds
280
°
C Maximum
2-5 seconds
Recommended Hand-Solder Parameters:
Time
(Seconds)
Preheat
Time
Dwell
Time
Cooling
Time
Note: These devices are not recommended for IR or
Convection Reflow process.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
http://www.littelfuse.com/series/312.html or
Please refer to www.littelfuse.com for current information. 318.html for current information.
155
Revised: July 16, 2008
312/318 Series
Cartridge and Axial Lead Fuses
3AG > Fast Acting > 312/318 Series
Product Characteristics
Body: Glass
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Test Condition A
2003-01 Annex A
Cap1:
Product Marking
Cap2:
Brand logo, current and voltage
ratings
Series and agency approval
marks
Humidity
and Elevated temperature (40°C) for 240 hours
Salt Spray
Operating
Temperature
Thermal
Shock
Vibration
Materials
Terminal Strength
Solderability
Test Condition B
Part Numbering System
Dimensions
Measurements displayed in millimeters (inches)
0312 xxxx M X CC
Series
312 = Cartridge
318 = Axial Leaded
312 Series
6.35
(.25")
31.75
(1.25")
Current Rating Code
Refer to Amp Code column of
Electrical Characteristics Table
Quantity Code
M = 1000
H = 100
V=5
318 Series
6.985
(.275")
32.72
(1.288")
Axial Lead Material:
Tin Coated Copper
0.813
(.032")
Packaging Code
X = Loose Pack
Option Codes
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.
39.68
(1.56")
.
Standard Length
12.70
(0.50”)
Short Lead Option
Packaging
Packaging Option
312 Series
(Cartridge Type)
Bulk
Bulk
Bulk
Bulk
Bulk
318 Series
(Axial Leaded)
Bulk
Bulk
Bulk
Bulk
312/318 Series
Quantity
Quantity &
Packaging Code
VX
MX
MXCC
5
100
1000
1000
100
5
100
1000
1000
VX
MX
MXSL
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/312.html or 318.html for current information.
Please refer to www.littelfuse.com
156
Revised: July 16, 2008
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