Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
312/318 Series Lead-Free 3AG, Fast-Acting Fuse
Description
RoHS
Pb
PS
E
The 3AG Fast-Acting Fuse solves a broad range
of application requirements while offering reliable
performance and cost-effective circuit protection.
Features
• In accordance with UL
Standard 248-14
• Available in cartridge
and axial lead format
and with various forming
dimensions
Ampere Range
• RoHS compliant and
Lead-free
Agency Approvals
Agency
Agency File Number
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
0.062A – 35A
0.062A – 35A
0.062A – 10A
12A – 30A
35A
Opening Time
4 hours, Minimum
1 hour, Maximum
5 sec., Maximum
10 sec., Maximum
20 sec., Maximum
E10480
312 Series: 0.062A - 25A
318 Series: 0.062A - 25A
312 Series: 0.062A - 30A
318 Series: 0.062A - 10A
312/318 Series 1A-5A
312/318 Series 6A-10A
318 Series: 12A - 30A
312/318 Series: 1-2A
312/318 Series: 3-6A
312/318 Series: 7-10A
312 Series: 0.062A - 10A
318 Series: 0.062A - 10A
29862
PS
E
NBK040205-E10480B/F
NBK040205-E10480D/H
E10480
SU05001-6008
SU05001-5005
SU05001-5006
N/A
Additional Information
Datasheet
312 Series
Resources
312 Series
Samples
312 Series
Accessories
312 & 318 Series
Datasheet
318 Series
Resources
318 Series
Samples
318 Series
For recommended fuse accessories for this product series,
see ‘Recommended
Accessories’
section.
© 2017 Littelfuse, Inc.
Application testing is strongly recommended. Specifications are subject to change without notice.
Revised: 03/22/17
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Electrical Characteristic Specifications by Item
Amp
Code
.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:
** For 318 Series 12A to 30A, the agency approval is only cURus.
Ampere
Rating (A)
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
32
32
32
32
32
32
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
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)
0.000249
0.00171
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
81.0
166.0
298.0
234.6
490.5
1414
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
**
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
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x
x
x
x
x
x
x
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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
200A@250Vac
10KA@125Vac
300A@32 Vac
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Temperature Re-rating Curve
Average Time Current Curves
.062 A
.125 A
.250 A
.375 A
.500 A
.750 A
1A
1.5 A
2A
2.5 A
3A
4A
5A
6A
7A
8A
10 A
1000
100
TIME IN SECONDS
10
1
Note:
Rerating depicted in this curve is in addition to the industry practice derating
of 25% for continuous operation.
0.1
0.01
0.005 0.01
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
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
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
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
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.
Time (Seconds)
Preheat Time
Dwell Time
Cooling Time
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Product Characteristics
Materials
Terminal Strength
Solderability
Body: Glass
Cap: Nickel–plated brass
Leads: Tin–plated Copper
MIL-STD-202, Method 211,
Test Condition A
MIL-STD-202 method 208
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-202, Method 107 Test Condition B: (5
,
cycles -65°C to +125°C)
MIL
-STD-202, Method 201
MIL
-STD-202, Method 103,
Test Condition A: High RH (95%),
and Elevated temperature (40°C) for 240 hours
MIL
-STD-202, Method 101,
Test Condition B
Salt Spray
Dimensions
Measurements displayed in millimeters (inches)
Part Numbering System
312
000
Series
(cartridge)
6.35±0.3
(.25")
31.75±1.12
(1.25")
318
000
Series
(axial leaded)
6.985±0.3
(.275")
32.72±1.12
(1.288")
Axial Lead Length:
Standard Length:
38.1
±
3.15(1.50") TYP
.
Short Lead Option:
12.7
±1.60
(0.50”) TYP
0312 xxxx M X P
Series
Amp Code
Refer to Amp Code column of
Electrical Characteristics Table
Axial Lead Diameter:
0.81±0.05 (.032") for (0.062A-15A)
1.02±0.06 (.040") for (20A-35A)
Quantity Code
M = 1000
Packaging Code
X = Filler
Axial Lead Material:
Tin-coated copper
Lead-free
Packaging
Packaging Option
312 Series
Bulk
Bulk
318 Series
Bulk
Bulk
Bulk
N/A
N/A
N/A
1000
100
1000
MX
HX
MXB
N/A
N/A
N/A
N/A
N/A
1000
100
MX
HX
N/A
N/A
Packaging Specification
Quantity
Quantity &
Packaging Code
Taping Width
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Recommended Accessories
Accessory
Type
Series
155100
Holder
342
346
345
Block
Clip
354
359
122
101
Description
Twist-Lock In-Line Fuseholder
Traditional Panel Mount Fuseholder
Panel Mount Flip-Top Shock-Safe Fuseholder
Shock-Safe Fuseholder with PC Mount, Solder Mount and Panel Mount options
Low Profile OMNI-BLOK
®
Fuse Block
High Current Screw Terminal Fuse Block
High Current Traditional PC Board Fuse Clip
Rivet/Eyelet Type Fuse Clip
Max
Application
Voltage
32
250
250
250
600
1000
1000
Max
Application
Amperage
20
20
15
20
30
30
30
15
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
www.littelfuse.com/disclaimer-electronics.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
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