Original Lucas type fuses

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

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Early type Lucas 188.216 with conical ends; Length = 1¼ “

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Later type Lucas with straight end and 1” length

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Lucas original Green boxes for conical 1¼ “ fuses 188 216

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Later Red boxes for 1” straight end 188 219 fuses of 50A

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Later Lucas 188 219 fuses of 50A (about 1962)

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