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. 668-5991
BrandRS PRO
$0.455
Each (In a Pack of 10)
units
2A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 668-6048
BrandRS PRO
$0.412
Each (In a Pack of 10)
units
3A 6.3 x 32mm F 250V ac - - Glass - - - -
RS Stock No. 668-6023
BrandRS PRO
$0.412
Each (In a Pack of 10)
units
1A 6.3 x 32mm F 250V ac - - Glass - - - -
RS Stock No. 563-340
BrandRS PRO
$0.226
Each (In a Pack of 10)
units
5A 5 x 20mm F 250V ac - - Ceramic - - - -
RS Stock No. 563-548
BrandRS PRO
$0.226
Each (In a Pack of 10)
units
1.25A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 668-6095
BrandRS PRO
$0.793
Each (In a Pack of 10)
units
15A 6.3 x 32mm T 250V ac - - Glass - - - -
RS Stock No. 414-409
BrandRS PRO
$1.441
Each (In a Pack of 10)
units
630mA 6.3 x 32mm T 500V ac - - Ceramic - - - -
RS Stock No. 911-3467
BrandRS PRO
$0.62
Each (In a Pack of 10)
units
3.15A 5 x 20mm F 250V ac - - Ceramic - - - UBM-P
RS Stock No. 911-3518
BrandRS PRO
$0.368
Each (In a Pack of 10)
units
10A 5 x 20mm T 250V ac - - Ceramic - - - UDA-P
RS Stock No. 247-4043
BrandRS PRO
$0.849
Each (In a Pack of 10)
units
8A 6.3 x 32mm T 500V ac - - Ceramic - - - -
RS Stock No. 668-6082
BrandRS PRO
$0.578
Each (In a Pack of 10)
units
3A 6.3 x 32mm T 250V ac - - Glass - - - -
RS Stock No. 668-6057
BrandRS PRO
$0.412
Each (In a Pack of 10)
units
10A 6.3 x 32mm F 250V ac - - Glass - - - -
RS Stock No. 611-0030
BrandRS PRO
$0.612
Each (In a Pack of 10)
units
15A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 247-4059
BrandRS PRO
$1.314
Each (In a Pack of 10)
units
6.3A 6.3 x 32mm T 500V ac - - Ceramic - UL 248-13 - -
RS Stock No. 563-520
BrandRS PRO
$0.342
Each (In a Pack of 10)
units
10A 5 x 20mm F 250V ac - - Ceramic - - - -
RS Stock No. 413-204
BrandRS PRO
$1.215
Each (In a Pack of 10)
units
2A 6.3 x 32mm F 500V ac - - Ceramic - - - -
RS Stock No. 563-334
BrandRS PRO
$0.388
Each (In a Pack of 10)
units
10A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 420-066
BrandRS PRO
$7.991
Each (In a Pack of 10)
units
500mA 5 x 20mm FF 250V ac - - Ceramic - UL 248-13 - -
RS Stock No. 668-6091
BrandRS PRO
$0.639
Each (In a Pack of 10)
units
10A 6.3 x 32mm T 250V ac - - Glass - - - -
RS Stock No. 911-3506
BrandRS PRO
$0.342
Each (In a Pack of 10)
units
5A 5 x 20mm T 250V ac - - Ceramic - - - UDA-P
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