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. 563-532
BrandRS PRO
$0.266
Each (In a Pack of 10)
units
5A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 209-9311
BrandRS PRO
$2.47
Each (In a Pack of 10)
units
16A 6.3 x 32mm T 500V ac - - Ceramic - UL 248-13 - -
RS Stock No. 563-520
BrandRS PRO
$0.415
Each (In a Pack of 10)
units
10A 5 x 20mm F 250V ac - - Ceramic - - - -
RS Stock No. 420-123
BrandRS PRO
$3.229
Each (In a Pack of 10)
units
6.3A 5 x 20mm FF 250V ac - - Ceramic - UL 248-13 - -
RS Stock No. 563-558
BrandRS PRO
$0.263
Each (In a Pack of 10)
units
1A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 563-431
BrandRS PRO
$0.305
Each (In a Pack of 10)
units
2A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-722
BrandRS PRO
$0.263
Each (In a Pack of 10)
units
2A 5 x 20mm T 250V ac - - Glass - - - -
RS Stock No. 209-9298
BrandRS PRO
$1.877
Each (In a Pack of 10)
units
16A 6.3 x 32mm F 500V ac - - Ceramic - UL 248-13 - -
RS Stock No. 413-816
BrandRS PRO
$6.282
Each (In a Pack of 10)
units
10A 12.7 x 29mm - 415V ac - - - gG - - MD
RS Stock No. 414-061
BrandRS PRO
$1.875
Each (In a Pack of 10)
units
10A 6.3 x 32mm T 500V ac - - Ceramic - UL 248-13 - -
RS Stock No. 420-145
BrandRS PRO
$2.40
Each (In a Pack of 10)
units
10A 5 x 20mm FF 250V ac - - Ceramic - UL 248-13 - -
RS Stock No. 668-6089
BrandRS PRO
$0.72
Each (In a Pack of 10)
units
5A 6.3 x 32mm T 250V ac - - Glass - - - -
RS Stock No. 668-5963
BrandRS PRO
$0.25
Each (In a Pack of 10)
units
3A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-643
BrandRS PRO
$0.273
Each (In a Pack of 10)
units
10A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 247-3999
BrandRS PRO
$1.416
Each (In a Pack of 10)
units
25A 6.3 x 32mm F 440V ac - - Ceramic - UL 248-13 - -
RS Stock No. 563-592
BrandRS PRO
$0.776
Each (In a Pack of 10)
units
10A 5 x 20mm T 250V ac - - Ceramic - - - UDA
RS Stock No. 563-526
BrandRS PRO
$0.251
Each (In a Pack of 10)
units
5A 5 x 20mm F 250V ac - - Glass - - - -
RS Stock No. 563-330
BrandRS PRO
$0.263
Each (In a Pack of 10)
units
6.3A 5 x 20mm F 250V ac - - Ceramic - - - -
RS Stock No. 721-1597
BrandRS PRO
$1.679
Each (In a Pack of 10)
units
500mA 6.3 x 32mm T 500V ac - - Ceramic - UL 248-13 - -
RS Stock No. 414-049
BrandRS PRO
$1.465
Each (In a Pack of 10)
units
3.15A 6.3 x 32mm T 500V ac - - Ceramic - UL 248-13 - -
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This glass cartridge fuse is ideal for providing protection to devices or internal circuits. They are deliberately weaker components which, when too much current is drawn, will blow. Features:Glass cartridge5 x 20 mm cartridge sizeT Speed Rating. Anti-surge. Low Breaking ...