Cartridge Fuses

Cartridge fuses are low-cost electrical safety devices that are used for the overload protection of 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. For more information on cartridge fuses please see our complete guide to fuses.

RS Components stock a comprehensive range of cartridge fuses from industry-leading brands including Cooper Bussmann, Littelfuse, Mersen and of course RS PRO.

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 to make the circuit complete again and allow the flow of current.

What are the different types of fuse markings and speed codes?

Cylindrical cartridge fuses are used in a range of industrial, commercial, and domestic applications. Selecting the correct fuse speed is essential for the protection of your device. Here are some of the most common markings you will find on a cartridge fuse.

  • FF = Very Fast Acting (Flink Flink)
  • F = Fast Acting (Flink)
  • M = Medium Acting (Mitteltrage)
  • T = Slow Acting (Trage)
  • TT = Very Slow Acting (Trage Trage)

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.

What current rating should you choose?

Cartridge fuses are available in a range of standard amperages. 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 Diameter Fuse Size Fuse Speed Overall Dimensions Voltage Rating Overall Length Body Material High Rupture Capacity Application Category Breaking Capacity at Maximum Voltage Rating UL Class Includes Indicator Size Designation
RS Stock No. 563-431
BrandRS PRO
kr 2,163
Each (In a Pack of 10)
Units
2A - 5 x 20mm F 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-592A
BrandRS PRO
kr 2,061
Each (In a Pack of 100)
Units
10A 5mm 5 x 20mm T 5 x 20mm 250V ac 20mm Ceramic - - - - - -
RS Stock No. 563-380
BrandRS PRO
kr 2,163
Each (In a Pack of 10)
Units
1A - 5 x 20mm F 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-592
BrandRS PRO
kr 3,892
Each (In a Pack of 10)
Units
10A - 5 x 20mm T 5 x 20mm 250V ac - Ceramic - gRL - - - -
RS Stock No. 563-693
BrandRS PRO
kr 3,892
Each (In a Pack of 10)
Units
5A - 5 x 20mm T 5 x 20mm 250V ac - Ceramic - - - - - -
RS Stock No. 563-693A
BrandRS PRO
kr 2,037
Each (In a Pack of 100)
Units
5A 5mm 5 x 20mm T 5 x 20mm 250V ac 20mm Ceramic - - - - - -
RS Stock No. 563-425
BrandRS PRO
kr 2,207
Each (In a Pack of 10)
Units
6.3A - 5 x 20mm T 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-425A
BrandRS PRO
kr 1,825
Each (In a Pack of 100)
Units
6.3A 5mm 5 x 20mm T 5 x 20mm 250V ac 20mm Glass - - - - - -
RS Stock No. 563-558A
BrandRS PRO
kr 1,825
Each (In a Pack of 100)
Units
1A 5mm 5 x 20mm T 5 x 20mm 250V ac 20mm Glass - - - - - -
RS Stock No. 563-621
BrandRS PRO
kr 2,207
Each (In a Pack of 10)
Units
3.15A - 5 x 20mm T 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-558
BrandRS PRO
kr 2,207
Each (In a Pack of 10)
Units
1A - 5 x 20mm T 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-491
BrandRS PRO
kr 2,163
Each (In a Pack of 10)
Units
3.15A - 5 x 20mm F 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-621A
BrandRS PRO
kr 1,796
Each (In a Pack of 100)
Units
3.15A 5mm 5 x 20mm T 5 x 20mm 250V ac 20mm Glass - - - - - -
RS Stock No. 611-0018
BrandRS PRO
kr 4,436
Each (In a Pack of 10)
Units
6.3A - 5 x 20mm T 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-548
BrandRS PRO
kr 2,218
Each (In a Pack of 10)
Units
1.25A - 5 x 20mm T 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 668-5963
BrandRS PRO
kr 2,827
Each (In a Pack of 10)
Units
3A - 5 x 20mm F 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 563-356
BrandRS PRO
kr 2,924
Each (In a Pack of 10)
Units
800mA - 5 x 20mm T 5 x 20mm 250V ac - Ceramic - - - - - -
RS Stock No. 209-9298
BrandRS PRO
kr 9,36
Each (In a Pack of 10)
Units
16A - 6.3 x 32mm F - 500V ac - Ceramic - - - UL 248-13 - -
RS Stock No. 563-706
BrandRS PRO
kr 2,163
Each (In a Pack of 10)
Units
6.3A - 5 x 20mm F 5 x 20mm 250V ac - Glass - - - - - -
RS Stock No. 413-210A
BrandRS PRO
kr 10,596
Each (In a Pack of 100)
Units
3A 6.3mm 6.3 x 32mm F 6.3 x 32mm 500V ac 32mm Ceramic - - - UL 248-13 - -