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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
312 000 Series
(cartridge)
318 000 Series
(axial leaded)
6.35±0.3
(.25")
32.72±1.12
(1.288")
31.75±1.12
(1.25")
6.985±0.3
(.275")
Axial Lead Diameter:
0.81±0.05 (.032")
Axial Lead Material:
Tin-coated copper
Axial Lead Length:
Standard Length:
39.68 (1.56") TYP.
Short Lead Option:
12.70 (0.50”) TYP
Product Characteristics
Packaging
Materials
Body: Glass
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Terminal Strength
MIL-STD-202, Method 211,
Test Condition A
Solderability MIL-STD-202 method 208
Product Marking
Cap1: Brand logo, current and voltage
ratings
Cap2: Series and agency approval
marks
Operating
Temperature
–55ºC to +125ºC
Thermal
Shock
MIL-STD-202, Method 107, Test Condition B: (5
cycles -65°C to +125°C)
Vibration MIL-STD-202, Method 201
Humidity
MIL-STD-202, Method 103,
Test Condition A: High RH (95%),
and Elevated temperature (40°C) for 240 hours
Salt Spray
MIL-STD-202, Method 101,
Test Condition B
Part Numbering System
0312 MX Pxxxx
Lead-free
Packaging Code
Quantity Code
Amp Code
Series
X = Filler
M = 1000
Refer to Amp Code column of
Electrical Characteristics Table
Dimensions
Measurements displayed in millimeters (inches)
Packaging Option Packaging Specification Quantity
Quantity &
Packaging Code
Taping Width
312 Series
Bulk N/A 1000 MX N/A
Bulk N/A 10 0 HX N/A
318 Series
Bulk N/A 1000 MX N/A
Bulk N/A 10 0 HX N/A
Bulk N/A 1000 MXB N/A