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. 806-8439
Mfr. Part No.ATQR12
BrandMersen
TWD448.50
Each (In a Pack of 10)
units
12 A 10 x 38mm T 600 V ac - - - - - - -
RS Stock No. 914-4342
Mfr. Part No.ATM3
BrandMersen
TWD229.00
Each
units
3 A 10 x 38mm F 600 V ac - - GMG - - - ATM
RS Stock No. 726-8846
Mfr. Part No.C1014578J
BrandMersen
TWD366.00
Each
units
12.5 A 10 x 38mm FF 690 V ac - - Ceramic GR - - Protistor
RS Stock No. 806-8405
Mfr. Part No.E1014580
BrandMersen
TWD340.70
Each (In a Pack of 10)
units
20 A 10 x 38mm F 690 V ac - - - GR - - -
RS Stock No. 188-6962
Mfr. Part No.X213598
BrandMersen
TWD64.60
Each (In a Pack of 10)
units
4 A 10 x 38mm - 500 V ac - - Ceramic GG - - -
RS Stock No. 715-8989
Mfr. Part No.DCT10-2
BrandMersen
TWD518.00
Each
units
10 A 10 x 38mm - 1 kV dc - - Melamine - - - -
RS Stock No. 188-6827
Mfr. Part No.Z084317
BrandMersen
TWD145.30
Each (In a Pack of 10)
units
16 A 6.3 x 32mm F 250 V ac - - Ceramic - - - -
RS Stock No. 914-4389
Mfr. Part No.F200864J
BrandMersen
TWD343.00
Each
units
30 A 10 x 38mm T 300 V ac, 600 V ac - - Fibreglass - - - ATQR
RS Stock No. 188-6647
Mfr. Part No.N084008
BrandMersen
TWD79.10
Each (In a Pack of 10)
units
2.5 A 5 x 20mm FF 250 V ac - - Ceramic - - - -
RS Stock No. 230-3480
Mfr. Part No.E213099
BrandMersen
TWD38.00
Each (In a Pack of 10)
units
25 A 10 x 38mm - 400 V ac - - Ceramic GG - - -
RS Stock No. 188-6956
Mfr. Part No.D213098
BrandMersen
TWD34.70
Each (In a Pack of 10)
units
2 A 10 x 38mm - 500 V ac - - Ceramic GG - - -
RS Stock No. 230-3474
Mfr. Part No.D211028
BrandMersen
TWD40.20
Each (In a Pack of 10)
units
20 A 10 x 38mm - 500 V ac - - Ceramic GG - - -
RS Stock No. 230-3496
Mfr. Part No.X216151
BrandMersen
TWD24.70
Each (In a Pack of 10)
units
20 A 10 x 38mm - 500 V ac - - Ceramic AM - - -
RS Stock No. 715-8982
Mfr. Part No.DCT1-2
BrandMersen
TWD252.00
Each
units
1 A 10 x 38mm - 1 kV dc - - Melamine - - - -
RS Stock No. 136-0494
Mfr. Part No.G1017204J
BrandMersen
TWD412.50
Each (In a Box of 10)
units
25 A 14 x 51mm - 500 V dc, 690 V ac, 700 V ac - - - GR - - Protistor
RS Stock No. 136-0495
Mfr. Part No.H1017205J
BrandMersen
TWD433.30
Each (In a Box of 10)
units
32 A 14 x 51mm - 500 V dc, 690 V ac, 700 V ac - - - GR - - Protistor
RS Stock No. 136-0627
Mfr. Part No.H1018585J
BrandMersen
TWD323.00
Each
units
7 A 10 x 38mm - 1 kV dc - - Glass Melamine GPV - - -
RS Stock No. 136-0638
Mfr. Part No.B1018556J
BrandMersen
TWD570.00
Each
units
40 A 22.2 x 58mm - 500 V dc, 690 V ac, 700 V ac - - - GR - - Protistor
RS Stock No. 188-6574
Mfr. Part No.X084016
BrandMersen
TWD79.10
Each (In a Pack of 10)
units
630 mA 5 x 20mm FF 250 V ac - - Ceramic - - - -
RS Stock No. 136-0499
Mfr. Part No.F1018560J
BrandMersen
TWD827.60
Each (In a Box of 10)
units
100 A 22.2 x 58mm - 500 V dc, 690 V ac, 700 V ac - - - GR - - Protistor