Glass Body
Axial Lead and Cartridge Fuses
3AG Fast-Acting Type 312/318 Series
290 www.littelfuse.com
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
Cartridge Axial Lead Nominal Nominal
Catalog Catalog Ampere Voltage Resistance Melting I2t
Number Number Rating Rating Cold Ohms A2Sec.
312.031 318.031 1/32 250 23.3 0.0000300
312.062 318.062 1/16 250 24.5 0.000249
312.100 318.100 1/10 250 11.2 0.00102
312.125 318.125 1/8 250 7.10 0.00289
312.150 318.150 15/100 250 5.10 0.00550
312.175 318.175 .175 250 3.85 0.00960
312.187 318.187 3/16 250 3.40 0.0128
312.200 318.200 2/10 250 3.00 0.0165
312.250 318.250 1/4 250 2.00 0.0355
312.300 318.300 3/10 250 1.40 0.0689
312.375 318.375 3/8 250 0.820 0.185
312.500 318.500 1/2 250 0.495 0.483
312.600 318.600 6/10 250 0.360 0.880
312.750 318.750 3/4 250 0.243 1.84
312 001 318 001 1 250 0.189 0.760
312 1.25 318 1.25 11/4250 0.138 1.45
312 01.5 318 01.5 11/2250 0.103 2.35
312 01.6 318 01.6 16/10 250 0.0930 2.80
312 1.75 318 1.75 13/4250 0.0850 3.60
312 01.8 318 01.8 18/10 250 0.0820 3.85
312 002 318 002 2 250 0.0700 5.20
312 2.25 318 2.25 21/4250 0.0590 7.20
312 02.5 318 02.5 21/2250 0.0510 9.54
312 003 318 003 3 250 0.0424 14.0
312 004 318 004 4 250 0.0291 28.5
312 005 318 005 5 250 0.0223 50.0
312 006 318 006 6 250 0.0177 81.1
312 007 318 007 7 250 0.0145 118.0
312 008 318 008 8 250 0.0121 166.0
312 010 318 010 10 250 0.00925 298.0
312 012 —12 32 0.0071 —
312 015 —15 32 0.0052 —
312 020 —20 32 0.0034 —
312 025 —25 32 0.0024 —
312 030 —30 32 0.0019 —
312 035 —35 32 0.0013 —
Average Time Current Curves
312 000 Series 318 000 Series
6.35
(.25")
32.385
(1.275")
31.75
(1.25")
6.985 (.275") 0.813
(.032")
38.1
(1.50") TYP.
Axial Lead Material: Solder coated copper.
A standard for cost-effective reliability and performance in circuit protec-
tion, the 3AG fuse satisfies a broad range of application requirements.
ELECTRICAL CHARACTERISTICS:
% of Ampere Ampere Opening
Rating Rating Time
110% 1/32–35 4 hours, Minimum
135% 1/32–35 1 hour, Maximum
1/32–10 5 sec., Maximum
200% 12–30 10 sec., Maximum
35 20 sec., Maximum
AGENCY APPROVALS: Listed by Underwriters Laboratories and
Certified by CSA through 30 amperes.
1/100–10 amperes listed to UL 248-14 (UL 198-G)
12–30 amperes listed to UL 275.
AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.
FUSES TO MIL SPEC: See F02A cartridge type in Military Section.
INTERUPTING RATING:
10,000A @ 125VAC
35A @ 250VAC
®
UL
®
QPL
ORDERING INFORMATION:
