Original Lucas type fuses
Lucas type fuses are used in 40’s, 50’s and 60’s British automobiles. The physical length of this type of fuse was originally 1¼ inch with conical ends and 1 inch for the later fuse types with straight ends. The change over from conical to straight ends took place towards the end of the 50’s. Lucas type fuses use a specific colour coding for the each rated current (see table below).
Lucas fuses have three ratings:
- continuous current they are designed to carry
- instantaneous current at which they will fuse
- continuous current at which they will also fuse.
The figure found on Lucas fuses is the continuous fusing current which is twice the continuous ampere rating that the system should be using; this can be a source of confusion when replacing Lucas fuses with non Lucas fuses.
Color coding scheme 1958
| Color | Lucas code | Type end | Cont. Amp | Instant. Amp | Cont. Amp (50%) |
|
Red on Yellow |
188 206 |
Conical |
5 |
6 |
2.5 |
|
Green on Black |
188 211 |
Conical |
10 |
12 |
5 |
|
Light Brown |
188 220 |
Conical |
15 |
18 |
7.5 |
|
Pink |
188 216 |
Conical |
25 |
30 |
12.5 |
|
White |
188 218 |
Conical |
35 |
40 |
17.5 |
|
Purple on Yellow |
188 219 |
Conical |
50 |
60 |
25 |
|
Yellow on Red |
188 222 |
Conical |
60 |
75 |
30 |
|
Yellow |
188 230 |
Straight |
4.5 |
5 |
2.25 |
|
Green |
188 232 |
Straight |
6 |
7 |
3 |
|
Nut Brown |
188 234 |
Straight |
8 |
10 |
4 |
|
Red on Green |
188 235 |
Straight |
10 |
12 |
5 |
|
Red on Brown |
188 236 |
Straight |
12 |
14 |
6 |
