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. 848-4096
Mfr. Part No.JJS-20
HK$303.60
Each
units
20 A 38 x 14mm F 600 V ac - - Melamine - - - JJS
RS Stock No. 852-7049
Mfr. Part No.MDA-12-R
HK$15.33
Each
units
12 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - MDA
RS Stock No. 848-4342
Mfr. Part No.KTN-R-30
HK$330.56
Each (In a Pack of 10)
units
30 A 14 x 51mm F 250 V ac - - - - - - KTN-R
RS Stock No. 848-3024
Mfr. Part No.BK-GMA-2-R
HK$3.20
Each
units
2 A 5 x 20mm F 250 V ac - - Glass - - - GMA
RS Stock No. 852-7083
Mfr. Part No.MDA-6-R
HK$15.40
Each
units
6 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - MDA
RS Stock No. 854-8941
Mfr. Part No.JKS-30
HK$396.10
Each
units
30 A 20.6 x 57.2mm F 600 V ac - - - - - - JKS
RS Stock No. 854-9020
Mfr. Part No.LPN-RK-30SP
HK$165.83
Each (In a Pack of 10)
units
30 A 14 x 51mm T 250 V ac, 250 V dc - - - - - - LPN, LPN-RK
RS Stock No. 852-7077
Mfr. Part No.MDA-3-R
HK$15.40
Each
units
3 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - MDA
RS Stock No. 852-7055
Mfr. Part No.MDA-20-R
HK$15.33
Each
units
20 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - MDA
RS Stock No. 854-8948
Mfr. Part No.JKS-25
HK$409.97
Each (In a Pack of 10)
units
25 A 20.6 x 57.2mm F 600 V ac - - - - - - JKS
RS Stock No. 854-8878
Mfr. Part No.FNQ-R-1
HK$310.19
Each
units
1 A 10 x 38mm T 600 V ac - - Fibre - - - FNQ-R
RS Stock No. 849-5888
Mfr. Part No.BBS-1-10
HK$137.08
Each (In a Pack of 10)
units
100 mA 10 x 35mm F 600 V ac - - Fibre - - - BBS
RS Stock No. 850-7219
Mfr. Part No.KLM-25
HK$247.73
Each (In a Pack of 10)
units
25 A 10 x 38mm F 600 V ac - - Melamine - - - KLM
RS Stock No. 851-1700
Mfr. Part No.AGX-3-16
HK$29.972
Each (In a Pack of 5)
units
187 mA 6.3 x 25mm F 250 V ac - - Glass - UL 248-14 - AGX
RS Stock No. 848-2687
Mfr. Part No.BK-ABC-15-R
HK$8.63
Each
units
15 A 6.3 x 32mm F 125 V dc, 250 V ac - - Ceramic - - - ABC
RS Stock No. 852-7073
Mfr. Part No.MDA-30-R
HK$15.33
Each
units
30 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - MDA
RS Stock No. 852-7421
Mfr. Part No.BK-ABC-25-R
HK$36.11
Each
units
25 A 6.3 x 32mm F 125 V dc, 250 V ac - - Ceramic - UL 248-14 - ABC
RS Stock No. 852-7058
Mfr. Part No.MDA-15-R
HK$14.71
Each
units
15 A 6.3 x 32mm T 250 V ac - - Ceramic - UL 248-14 - MDA
RS Stock No. 854-9064
Mfr. Part No.F03A250V12A
HK$49.72
Each (In a Pack of 100)
units
12 A 6.3 x 32mm - 250 V ac - - - - - - F03A
RS Stock No. 852-7547
Mfr. Part No.TDC600-2A
HK$7.24
Each
units
2 A 6.3 x 25mm F 600 V ac - - Ceramic - - - TDC600