BS1361 Consumer Unit Fuses
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BS1361 is the British Standard for some of the very common fuses found in your fusebox / consumer unit.
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These are BS1361 type 1 fuses, used in your consumer unit
Type
Amps
 Colour
 Length
 Diameter
 Typical application
LA5

LA5A
 LA5 Fuse 5
 WHITE
 23mm
 4.8mm
 Lighting
LC15

LC15A
 LC15 Fuse
 15
 BLUE
 26mm
 6.4mm
 Immersion heater
LC20

LC20A
 LC20 Fuse
 20
 YELLOW
 26mm
 6.4mm
 Heaters
LD30

LD30A
 LD30 Fuse
 30
 RED
 29mm
 8.0mm
 Sockets, cookers and small showers
LK45

LK45A
 LK45 Fuse
 45
 GREEN
 35mm
 9.5mm
 Larger showers

Watch out for the little LA5 5 Amp fuses, they look like a fuse out of a plugtop, but they are a bit smaller. It's very common to blow one of these little fuses if a bulb blows (there is a big surge of current at the instant a bulb pops).

These are BS88 fuses, often used alongside BS1361 fuses
Type
Amps
 Colour
 Length
 Diameter
 Typical application
LC10

LC10A
 LC10 Fuse
 10
 BLACK
 26mm
 6.4mm
 Misc
LK35

LK35A
 LK35 Fuse
 35
 BLACK
 35mm
 9.5mm
 Showers

These BS1361 type 2a fuses are used to cover an entire house
Type
Amps
 Colour
 Length
 Diameter
 Typical application
ME60

ME60A
 ME60 Fuse
 60
 BLUE/WHITE
 57mm
 22.23mm House service cut-out
ME80

ME80A
 ME80 Fuse
 80
 BLUE/WHITE 57mm 22.23mm
 House service cut-out
Other sizes are available from ME5 (5 Amp) to ME100 (100 Amp)


These BS1361 type 2b fuses are used to cover an entire house
Type
Amps
 Colour
 Length
 Diameter
 Typical application
MF60

MF60A
 MF60 Fuse
 60
 BLUE/WHITE 57mm 30.16mm
 House service cut-out
MF80

MF80A
 MF80 Fuse
 80
 BLUE/WHITE 57mm 30.16mm
 House service cut-out
Other sizes are available from MF20 (20 Amp) to MF100 (100 Amp)

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