Cartridge Fuses

Cartridge fuses are a low cost electrical safety device that is used to protect electrical circuits and appliances. They are cylindrical in shape and have a contact point at each end. Cartridge fuses are typically constructed from ceramic, glass or porcelain.

How do cartridge fuses work?

Cartridge fuses contain a piece of wire that melts when too much current flows through the circuit. When the wire melts, it breaks the circuit which prevents any damage. This is often referred to as burning out or blowing out. Put simply, when a fuse blows, the circuit is broken. Once a fuse has blown, it will need replacing in order to make the circuit complete again, and allow the flow of current.

Different types of cartridge fuse

Most cartridge fuses are general purpose and feature no time delay, however, some heavy duty options will have a time delay features that enables motors to start up.

Why use cartridge fuses?

Cartridge fuses are a relatively cheap way of protecting electrical equipment from short circuits and overcurrent. They are incredibly safe as they do not produce flames, arcs or gas when they burn out and break the circuit. Their speed of operation is also incredibly quick, as they react almost instantly.

What cartridge fuse should you choose?

Cartridge fuses are available in a range of standard current rating variants. When choosing the correct fuse for your application, you should choose a fuse with a nominally higher current rating than the device that it is being used in. This means that if there is a slight, harmless power increase, the fuse will not blow.


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Description Price Current Rating Fuse Size Fuse Speed Voltage Rating Overall Length Diameter Body Material Application Category UL Class Fuse Standard Series
RS Stock No. 459-7924
Mfr. Part No.DMM-B-11A
$28.134
Each (In a Pack of 5)
units
11 A 10 x 38mm F 1 kV ac - - Melamine - - - DMM-B
RS Stock No. 459-7918
Mfr. Part No.DMM-B-44/100
$18.378
Each (In a Pack of 5)
units
440 mA 10 x 35mm F 1 kV ac, 1 kV dc - - Melamine - - - DMM-B
RS Stock No. 878-3930
Mfr. Part No.0FLM030.T
BrandLittelfuse
$13.20
Each
units
30 A 10 x 38mm T 250 V ac - - - - - - FLM
RS Stock No. 563-532
BrandRS PRO
$0.239
Each (In a Pack of 10)
units
5 A 5 x 20mm T 250 V ac - - Glass - - - -
RS Stock No. 209-9311
BrandRS PRO
$2.433
Each (In a Pack of 10)
units
16 A 6.3 x 32mm T 500 V ac - - Ceramic - UL 248-13 - -
RS Stock No. 563-520
BrandRS PRO
$0.38
Each (In a Pack of 10)
units
10 A 5 x 20mm F 250 V ac - - Ceramic - - - -
RS Stock No. 188-6956
Mfr. Part No.D213098
BrandMersen
$2.446
Each (In a Pack of 10)
units
2 A 10 x 38mm - 500 V ac - - Ceramic GG - - -
RS Stock No. 420-123
BrandRS PRO
$3.181
Each (In a Pack of 10)
units
6.3 A 5 x 20mm FF 250 V ac - - Ceramic - - - -
RS Stock No. 851-1233
Mfr. Part No.FNQ-2
$55.52
Each
units
2 A 10 x 38mm T 500 V ac - - Fibre - - - FNQ
RS Stock No. 563-431
BrandRS PRO
$0.301
Each (In a Pack of 10)
units
2 A 5 x 20mm F 250 V ac - - Glass - - - -
RS Stock No. 729-6740
Mfr. Part No.892583
BrandFluke
$19.80
Each
units
15 A 10 x 38mm - 600 V 38.1mm 10.3mm - - - - -
RS Stock No. 563-558
BrandRS PRO
$0.251
Each (In a Pack of 10)
units
1 A 5 x 20mm T 250 V ac - - Glass - - - -
RS Stock No. 563-722
BrandRS PRO
$0.251
Each (In a Pack of 10)
units
2 A 5 x 20mm T 250 V ac - - Glass - - - -
RS Stock No. 738-3103
Mfr. Part No.0242.050UR
BrandLittelfuse
$8.03
Each
units
50 mA 3 x 8.4mm F 250 V ac/dc - - Ceramic - - - 242
RS Stock No. 736-1416
Mfr. Part No.70-172-40/0.5A
BrandSIBA
$9.24
Each
units
500 mA 6.3 x 32mm FF 1 kV ac, 1 kV dc - - Ceramic - - - GZ
RS Stock No. 209-9298
BrandRS PRO
$1.849
Each (In a Pack of 10)
units
16 A 6.3 x 32mm F 500 V ac - - Ceramic - - - -
RS Stock No. 914-4405
Mfr. Part No.L216762J
BrandMersen
$16.85
Each
units
6 A 10 x 38mm F 600 V ac - - GMG - - - ATMR
RS Stock No. 729-6719
Mfr. Part No.830828
BrandFluke
$7.70
Each
units
1 A 10.3 x 34.9mm - 600 V 34.9mm 10.3mm - - - - -
RS Stock No. 413-816
BrandRS PRO
$5.983
Each (In a Pack of 10)
units
10 A 12.7 x 29mm - 415 V ac - - - GG - - MD
RS Stock No. 247-4223
Mfr. Part No.50-124-06/25A
BrandSIBA
$19.61
Each
units
25 A 14 x 51mm - 690 V ac - - Ceramic GR - - URZ
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