8-12 CAB AND CHASSIS ELECTRICAL
Wire Size Table
Fuse, Fusible Link and Circuit Breaker
Fuse
Fuses are the most common form of circuit protection
used in vehicle wiring. A fuse is a thin piece of wire or
strip of metal encases in a glass or plastic housing. It is
wired in series with the circuit it protects. When there is
an overload of current in a circuit, such as a short of a
ground, the wire or metal strip is designed to burn out
and interrupt the flow of current. This prevents a surge
of high current from reaching and damaging other com-
ponents in the circuit.
Determine the cause of the overloaded before replacing
the fuse.
The replacement fuse must have the same amperage
specifications as the original fuse.
Never replace a blown fuse with a fuse of a different am-
perage specification.
Doing so can result in an electrical fire or other serious
circuit damage. A blown fuse is easily identified.
N8A0025E
Nominal size
Cross sectional area
(mm
2
)
Outside diameter
(mm)
Allowable current
(A)
AWG size
(cross reference)
0.3
0.5
0.85
1.25
2
3
5
8
15
20
0.372
0.563
0.885
1.287
2.091
3.296
5.227
7.952
13.36
20.61
1.8
2.0
2.2
2.5
2.9
3.6
4.4
5.5
7.0
8.2
9
12
16
21
28
37.5
53
67
75
97
22
20
18
16
14
12
10
8
6
4
N8A0026E