© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BA.08/13/20
3AG > Fast Acting > 312/318 Series
Axial Lead & Cartridge Fuses
312/318 Series Lead-Free 3AG, Fast-Acting Fuse
The 312 and 318 Series are 3AG Fast-Acting fuses that
solve solves a broad range of application requirements
while offering reliable performance and cost-effective
circuit protection.
Agency Approvals
Agency Agency File Number Ampere Range
E10480 0.062 - 10A
E10480 12A-25A
29862
312 Series: 0.062A - 30A
318 Series: 0.062A - 10A
PS
E
(312 Series)
NBK060618-E10480A
NBK060618-E10480C
1A - 5A
6A - 10A
(318 Series)
NBK060618-E10480B
NBK060618-E10480D
1A - 5A
6A - 10A
E10480 318 Series: 12A - 30A
SU05001-6008
SU05001-5005
SU05001-5006
1A - 2A
3A - 6A
7A - 10A
N/A 0.062A - 10A
Features
Electrical Characteristics for Series
Applications
% of Ampere Rating Ampere Rating Opening Time
100% 0.062A – 35A 4 hours, Minimum
135% 0.062A – 35A 1 hour, Maximum
200%
0.062A – 10A 5 sec., Maximum
12A – 30A 10 sec., Maximum
35A 20 sec., Maximum
RoHS
Pb
• In accordance with UL
Standard 248-14
• Available in cartridge
and axial lead format
and with various forming
dimensions
• RoHS compliant and
Lead-free
Used as supplementary protection in appliance or
utilization equipment to provide individual protection for
components or internal circuits.
PS
E
Description
Additional Information
Datasheet
Samples
Resources
Datasheet
Samples
Resources
312 Series
318 Series
312 Series
318 Series
312 Series 312 & 318 Series
318 Series
Accessories
For recommended fuse accessories for this product series,
see ‘Recommended Accessories’ section.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BA.08/13/20
3AG > Fast Acting > 312/318 Series
Axial Lead & Cartridge Fuses
Amp
Code
Ampere
Rating (A)
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I
2
t (A
2
sec)
Agency Approvals
PS
E
0.062 0.062 250
35A@250Vac
10KA@125Vac
24.7 0.000249 x - - - x x
0.1 0.1 250 11.28 0.00171 x - - - x x
0.125 0.125 250 7.145 0.00289 x - - - x x
0.15 0.15 250 5.13 0.00550 x - - - x x
0.175 0.175 250 3.875 0.00960 x - - - x x
0.187 0.187 250 3.42 0.0128 x - - - x x
0.2 0.2 250 3.02 0.0165 x - - - x x
0.25 0.25 250 2.01 0.0355 x - - - x x
0.3 0.3 250 1.405 0.0689 x - - - x x
0.375 0.375 250 0.825 0.185 x - - - x x
0.5 0.5 250 0.498 0.483 x - - - x x
0.6 0.6 250 0.362 0.88 x - - - x x
0.75 0.75 250 0.2445 1.84 x - - - x x
1.0 1 250 0.19 0.76 x - x x x x
1.25 1.25 250
100A@250Vac
10KA@125Vac
0.1385 1.45 x - x x x x
1.5 1. 5 250 0.1036 2.35 x - - x x x
1.6 1. 6 250 0.0934 2.8 x - x x x x
1.75 1.75 250 0.0856 3.6 x - - x x x
1.8 1. 8 250 0.0825 3.85 x - - x x x
2.0 2 250 0.0704 5.2 x - x x x x
2.25 2.25 250 0.0594 7. 2 x - x x x x
2.5 2.5 250 0.0513 9.54 x - x x x x
3.0 3 250 0.0427 14.0 x - x x x x
4.0 4 250
200A@250Vac
10KA@125Vac
0.0293 28.5 x - x x x x
5.0 5 250 0.0224 50.0 x - x x x x
6.0 6 250 0.0178 118.0 x - x x x x
7. 0 7 250 0.0146 81.0 x - x x x x
8.0 8 250 0.0122 166.0 x - x x x x
10.0 10 250 0.0093 298.0 x - x x x x
12.0 12 32
300A@32 Vac
0.0072 234.6 x
†
x
**
- - x
†
-
15.0 15 32 0.0052 490.5 x
†
x
**
- - x
†
-
20.0 20 32 0.0035 1414 x
†
x
**
- - x
†
-
25.0 25 32 0.0024 2041 x
†
x
**
- - x
†
-
30.0 30 32 0.0019 3717 - x
**
- - x
†
-
35.0 35 32 0.0013 7531
- - - - - -
Electrical Characteristic Specifications by Item
Notes:
* - For 312 and 318 Series: Listed for the US and Canada (cULus)
** - For 318 Series (12A-25A) and 312 Series (30A only): Recognized for the US and Canada (cURus).
† - For 312 series only.