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. 247-3961
BrandRS PRO
PHP34.578
Each (In a Pack of 10)
units
4A 6.3 x 32mm F 500V ac - - Ceramic - - - -
RS Stock No. 563-340
BrandRS PRO
PHP8.482
Each (In a Pack of 10)
units
5A 5 x 20mm F 250V ac - - Ceramic - - - -
RS Stock No. 563-429
BrandRS PRO
PHP10.116
Each (In a Pack of 10)
units
8A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 563-453
BrandRS PRO
PHP8.545
Each (In a Pack of 10)
units
1.5A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-643
BrandRS PRO
PHP8.794
Each (In a Pack of 10)
units
10A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-706
BrandRS PRO
PHP8.093
Each (In a Pack of 10)
units
6.3A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 209-9383
BrandRS PRO
PHP95.406
Each (In a Pack of 10)
units
5A 6.3 x 32mm FF 600V ac - - Ceramic - - - -
RS Stock No. 611-8999
BrandRS PRO
PHP50.738
Each (In a Pack of 10)
units
2A 6.3 x 32mm T 250V ac - - Glass - - - -
RS Stock No. 537-1521
BrandRS PRO
PHP16.75
Each (In a Pack of 10)
units
4A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 247-4043
BrandRS PRO
PHP40.20
Each (In a Pack of 10)
units
8A 6.3 x 32mm T 500V ac - - Ceramic - - - -
RS Stock No. 610-9995
BrandRS PRO
PHP20.311
Each (In a Pack of 10)
units
4A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 563-542
BrandRS PRO
PHP8.482
Each (In a Pack of 10)
units
4A 5 x 20mm T 250V ac - - Glass - - - UTE
RS Stock No. 668-6023
BrandRS PRO
PHP11.128
Each (In a Pack of 10)
units
1A 6.3 x 32mm F 250V ac - - Glass - - - -
RS Stock No. 611-0018
BrandRS PRO
PHP12.324
Each (In a Pack of 10)
units
6.3A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 169-9433
BrandRS PRO
PHP11,004.36
1 Bag of 1000
Bag(s)
4A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 668-5994
BrandRS PRO
PHP11.128
Each (In a Pack of 10)
units
1A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 911-3506
BrandRS PRO
PHP14.146
Each (In a Pack of 10)
units
5A 5 x 20mm T 250V ac - - Ceramic - - - UDA-P
RS Stock No. 668-6007
BrandRS PRO
PHP12.223
Each (In a Pack of 10)
units
3A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 563-548
BrandRS PRO
PHP8.482
Each (In a Pack of 10)
units
1.25A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 911-3388
BrandRS PRO
PHP13.801
Each (In a Pack of 10)
units
800mA 5 x 20mm T 250V ac - - Glass - - - GTE
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