Axial Lead & Cartridge Fuses
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
Standard 248-14
and axial lead format
and with various
forming dimensions
Agency Approvals
Agency
Agency File Number
Ampere Range
Lead-free (except
10mA and 31mA rated
items)
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%
Ampere Rating
10mA – 35A
10mA – 35A
10mA – 10A
200%
12A – 30A
35A
Opening Time
4 hours, Minimum
1 hour, Maximum
5 sec., Maximum
10 sec., Maximum
20 sec., Maximum
E10480
AU1410
LR 29862
PS
E
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 - 10A
NBK040205-
E10480B/F
E10480
SU05001-
5005/5006/6005/6008
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/312.html
or /318.html for current information.
313
Revised: January 7, 2009
312/318 Series
312/318 Series
Introduction to & Cartridge Fuses
Axial Lead Circuit Protection
Transientology
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.
*
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
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
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
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
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
**
Agency Approvals
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
35A@250Vac
10KA@125Vac
100A@250Vac
10KA@125Vac
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
200A@250Vac
10KA@125Vac
015.
*
020.
*
025.
*
030.
*
035.
NOTES:
300A@32 Vac
* 10mA and 31mA are not RoHS compolaint as the glass bead contains Pb.
** For 318 Series 12A to 30A, the agency approval is only cURus.
312/318 Series
314
Revised: January 7, 2009
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/312.html
or /318.html for current information.
Axial Lead & Cartridge Fuses
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
1
0.1
CURRENT IN AMPERES
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
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
140
150
160
170
180
190
200
210
220
230
240
10
20
30
40
50
60
70
80
90
0
0
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
Lead-Free Recommendation
Temperature Minimum:
Temperature Maximum:
Preheat Time:
Solder Pot Temperature:
Solder Dwell Time:
100
°
C
150
°
C
60-180 seconds
260
°
C Maximum
2-5 seconds
Time
(Seconds)
Preheat
Time
Dwell
Time
Cooling
Time
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.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/312.html
or /318.html for current information.
315
Revised: January 7, 2009
312/318 Series
312/318 Series
Introduction to & Cartridge Fuses
Axial Lead Circuit Protection
Transientology
Product Characteristics
Body: Glass
Cap: Nickel–plated brass
Leads: Tin–plated Copper
MIL-STD-202G, Method 211A,
Test Condition A
Reference IEC 60127 Second Edition
2003-01 Annex A
Cap1:
Product Marking
Cap2:
Brand logo, current and voltage
ratings
Series and agency approval
marks
Operating
Temperature
Thermal
Shock
Vibration
Humidity
–55ºC to +125ºC
MIL
-STD-202G, Method 107G, Test Condition B:
(5 cycles -65°C to +125°C)
MIL
-STD-202G, Method 201 A
MIL
-STD-202G, Method 103B,
Test Condition A: High RH (95%),
and Elevated temperature (40°C) for 240 hours
MIL
-STD-202G, Method 101D,
Test Condition B
Materials
Terminal Strength
Solderability
Salt Spray
Dimensions
Measurements displayed in millimeters (inches)
Part Numbering System
312 Series
6.35
(.25")
31.75
(1.25")
0312 xxxx M X P
Series
Amp Code
Refer to Amp Code column of
Electrical Characteristics Table
Quantity Code
M = 1000
318 Series
6.985
(.275")
32.72
(1.288")
Axial Lead Material:
Tin Coated Copper
0.813
(.032")
Packaging Code
X = Filler
Lead-free
39.68
(1.56") TYP
.
Standard Length
12.70
(0.50”) TYP
Short Lead Option
Packaging
Packaging Option
312 Series
(Cartridge Type)
Bulk
Bulk
Bulk
Bulk
Bulk
318 Series
(Axial Leaded)
Bulk
Bulk
Bulk
Bulk
Bulk
5
100
1000
1000
1000
VX
HX
MX
MXSL
MXB
5
100
1000
1000
100
VX
HX
MX
MXCC
HXCC
Quantity
Quantity &
Packaging Code
312/318 Series
316
Revised: January 7, 2009
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/312.html
or /318.html for current information.
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