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 Diameter Voltage Rating Overall Length Body Material Application Category UL Class Fuse Standard Priced to Clear Series
RS Stock No. 413-248
BrandRS PRO
£0.62
Each (In a Pack of 10)
Units
10A 6.3 x 32mm F - 500V ac - Ceramic - UL 248-13 - - -
RS Stock No. 563-706
BrandRS PRO
£0.11
Each (In a Pack of 10)
Units
6.3A 5 x 20mm F - 250V ac - Glass - - - - -
RS Stock No. 563-649
BrandRS PRO
£0.162
Each (In a Pack of 10)
Units
3A 5 x 20mm F - 250V ac - Glass - - - - -
RS Stock No. 209-9298
BrandRS PRO
£0.62
Each (In a Pack of 10)
Units
16A 6.3 x 32mm F - 500V ac - Ceramic - - - - -
RS Stock No. 563-649A
BrandRS PRO
£0.054
Each (In a Pack of 100)
Units
3A 5 x 20mm F 5.2mm 250V ac 20mm Glass - - - - -
RS Stock No. 563-621A
BrandRS PRO
£0.109
Each (In a Pack of 100)
Units
3.15A 5 x 20mm T 5mm 250V ac 20mm Glass - - - - -
RS Stock No. 563-621
BrandRS PRO
£0.115
Each (In a Pack of 10)
Units
3.15A 5 x 20mm T - 250V ac - Glass - - - - -
RS Stock No. 413-197A
BrandRS PRO
£0.50
Each (In a Pack of 100)
Units
1A 6.3 x 32mm F 6.35mm 500V ac 32mm Ceramic - - - - -
RS Stock No. 413-197
BrandRS PRO
£0.62
Each (In a Pack of 10)
Units
1A 6.3 x 32mm F - 500V ac - Ceramic - UL 248-13 - - -
RS Stock No. 563-542
BrandRS PRO
£0.115
Each (In a Pack of 10)
Units
4A 5 x 20mm T - 250V ac - Glass - - - - UTE
RS Stock No. 563-542A
BrandRS PRO
£0.109
Each (In a Pack of 100)
Units
4A 5 x 20mm T 5mm 250V ac 20mm Glass - - - - UTE
RS Stock No. 414-055
BrandRS PRO
£0.662
Each (In a Pack of 10)
Units
5A 6.3 x 32mm T - 500V ac - Ceramic - - - - -
RS Stock No. 414-055A
BrandRS PRO
£0.594
Each (In a Pack of 100)
Units
5A 6.3 x 32mm T 6.35mm 500V ac 32mm Ceramic - - - - -
RS Stock No. 667-0337
BrandRS PRO
£3.59
Each (In a Box of 10)
Units
60A 22.2 x 58mm - - 415V ac - - - - - - -
RS Stock No. 413-210
BrandRS PRO
£0.62
Each (In a Pack of 10)
Units
3A 6.3 x 32mm F - 500V ac - Ceramic - - - - 70-065-63
RS Stock No. 413-210A
BrandRS PRO
£0.50
Each (In a Pack of 100)
Units
3A 6.3 x 32mm F 6.35mm 500V ac 32mm Ceramic - - - - 70-065-63
RS Stock No. 668-5963
BrandRS PRO
£0.105
Each (In a Pack of 10)
Units
3A 5 x 20mm F - 250V ac - Glass - - - - -
RS Stock No. 414-033
BrandRS PRO
£0.662
Each (In a Pack of 10)
Units
2A 6.3 x 32mm T - 500V ac - Ceramic - - - - -
RS Stock No. 420-230
BrandRS PRO
£1.342
Each (In a Pack of 10)
Units
16A 6.3 x 32mm FF - 500V ac - Ceramic - - - - -
RS Stock No. 563-526
BrandRS PRO
£0.11
Each (In a Pack of 10)
Units
5A 5 x 20mm F - 250V ac - Glass - - - - -
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