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. 563-431
BrandRS PRO
SGD0.207
Each (In a Pack of 10)
units
2A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-532
BrandRS PRO
SGD0.207
Each (In a Pack of 10)
units
5A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 247-3955
BrandRS PRO
SGD3.125
Each (In a Pack of 10)
units
20A 6.3 x 32mm FF 500V ac - - Ceramic - - - -
RS Stock No. 414-061
BrandRS PRO
SGD1.346
Each (In a Pack of 10)
units
10A 6.3 x 32mm T 500V ac - - Ceramic - - - -
RS Stock No. 563-722
BrandRS PRO
SGD0.218
Each (In a Pack of 10)
units
2A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 668-5963
BrandRS PRO
SGD0.265
Each (In a Pack of 10)
units
3A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-425
BrandRS PRO
SGD0.218
Each (In a Pack of 10)
units
6.3A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 610-9686
BrandRS PRO
SGD0.433
Each (In a Pack of 10)
units
2A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-643
BrandRS PRO
SGD0.226
Each (In a Pack of 10)
units
10A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 668-6035
BrandRS PRO
SGD0.285
Each (In a Pack of 10)
units
2A 6.3 x 32mm F 250V ac - - Glass - - - -
RS Stock No. 563-699
BrandRS PRO
SGD0.431
Each (In a Pack of 10)
units
3.15A 5 x 20mm T 250V ac - - Ceramic - - - -
RS Stock No. 169-9433
BrandRS PRO
SGD280.00
1 Bag of 1000
Bag(s)
4A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 537-1521
BrandRS PRO
SGD0.394
Each (In a Pack of 10)
units
4A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 668-6089
BrandRS PRO
SGD0.485
Each (In a Pack of 10)
units
5A 6.3 x 32mm T 250V ac - - Glass - - - -
RS Stock No. 563-419
BrandRS PRO
SGD0.218
Each (In a Pack of 10)
units
1A 5 x 20mm F 250V ac - - Ceramic - - - -
RS Stock No. 541-3108
BrandRS PRO
SGD0.41
Each (In a Pack of 10)
units
5A 5 x 20mm F 250V ac - - Glass - - - 217
RS Stock No. 878-3801
BrandRS PRO
SGD0.362
Each (In a Pack of 100)
units
5A 5 x 20mm F 250V ac - - Glass - - - 217
RS Stock No. 247-4059
BrandRS PRO
SGD0.861
Each (In a Pack of 10)
units
6.3A 6.3 x 32mm T 500V ac - - Ceramic - UL 248-13 - -
RS Stock No. 209-9305
BrandRS PRO
SGD2.404
Each (In a Pack of 10)
units
12.5A 6.3 x 32mm T 500V ac - - Ceramic - - - -
RS Stock No. 413-248
BrandRS PRO
SGD0.891
Each (In a Pack of 10)
units
10A 6.3 x 32mm F 500V ac - - Ceramic - UL 248-13 - -
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