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. 563-346
BrandRS PRO
$0.226
Each (In a Pack of 10)
units
4 A 5 x 20mm F 250 V ac - - Ceramic - - - -
RS Stock No. 668-6079
BrandRS PRO
$0.639
Each (In a Pack of 10)
units
2 A 6.3 x 32mm T 250 V ac - - Glass - - - -
RS Stock No. 420-230
BrandRS PRO
$2.43
Each (In a Pack of 10)
units
16 A 6.3 x 32mm FF 500 V ac - - Ceramic - - - -
RS Stock No. 537-1278
Mfr. Part No.S500-200-R
$0.557
Each (In a Pack of 10)
units
200 mA 5 x 20mm F 250 V ac - - Glass - - - S500
RS Stock No. 537-1666
Mfr. Part No.S506-50-R
$0.916
Each (In a Pack of 10)
units
50 mA 5 x 20mm T 250 V ac - - Glass - - - S506
RS Stock No. 169-9411
Mfr. Part No.S500-200-R
$511.13
1 Bag of 1000
Bag(s)
200 mA 5 x 20mm F 250 V ac - - Glass - - - S500
RS Stock No. 537-1515
Mfr. Part No.S505-2-R
$0.277
Each (In a Pack of 10)
units
2 A 5 x 20mm T 250 V ac - - Ceramic - - - S505
RS Stock No. 167-7869
Mfr. Part No.0001.1004
BrandSchurter
$0.696
Each (In a Pack of 10)
units
1 A 5 x 20mm F 250 V ac - - Ceramic - - - SP 5X20
RS Stock No. 820-7199
Mfr. Part No.0SPF030.T
BrandLittelfuse
$21.90
Each
units
30 A 10 x 38mm F 1 kV dc - - Melamine - - - SPF
RS Stock No. 458-8554
Mfr. Part No.KTK-25
$16.822
Each (In a Pack of 5)
units
25 A 10 x 38mm F 600 V ac - - Melamine - - - KTK
RS Stock No. 703-2675
Mfr. Part No.8020.0607.G
BrandSchurter
$1.65
Each (In a Pack of 10)
units
30 A 6.3 x 32mm T 250 V ac - - Ceramic - - - SUT 6.3x32
RS Stock No. 314-4838
Mfr. Part No.50-179-06/25A
BrandSIBA
$18.46
Each (In a Pack of 5)
units
25 A 10 x 38mm - 700 V ac - - Ceramic GR UL 248-13 - URZ
RS Stock No. 537-1060
Mfr. Part No.S505-10-R
$0.404
Each (In a Pack of 10)
units
10 A 5 x 20mm T 250 V ac - - Ceramic - - - S505
RS Stock No. 537-8667
Mfr. Part No.S506-63-R
$0.834
Each (In a Pack of 10)
units
63 mA 5 x 20mm T 250 V ac - - Glass - - - S506
RS Stock No. 789-7842
Mfr. Part No.0034.1526
BrandSchurter
$0.584
Each (In a Bag of 10)
units
10 A 5 x 20mm F 250 V ac - - Glass - - - FSF 5x20
RS Stock No. 787-4303
Mfr. Part No.0314012.HXP
BrandLittelfuse
$1.226
Each (In a Pack of 5)
units
12 A 6.3 x 32mm F 250 V ac - - Ceramic - - - 314
RS Stock No. 247-4037
BrandRS PRO
$2.55
Each (In a Pack of 10)
units
25 A 6.3 x 32mm T 440 V ac - - Ceramic - - - -
RS Stock No. 188-7505
Mfr. Part No.C215650
BrandMersen
$7.065
Each (In a Pack of 10)
units
63 A 22.2 x 58mm - 690 V ac - - Ceramic AM - - -
RS Stock No. 173-7913
Mfr. Part No.8020.0607.G
BrandSchurter
$697.00
1 Box of 1000
Box(es)
30 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - SUT 6.3x32
RS Stock No. 293-8250
Mfr. Part No.0 133 32
BrandLegrand
$1.869
Each (In a Pack of 10)
units
32 A 10 x 38mm F 400 V ac - - Ceramic - - - 0 133
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This glass cartridge fuse is ideal for providing ...
Description:
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 ...