Isolator & Switch Disconnectors

Fused switches are devices used to ensure that a circuit is completely powered down in order for it to be serviced or maintained. They isolate a given part of the circuit by cutting off its electrical supply, making it safe for service or maintenance. You can find out more in our complete guide to isolators and switch disconnectors.

Fused switches contain multiple fuses inside the same enclosure so that it is easy to select and isolate a particular part of the circuit. For example, an isolator switch can be used in a substation to physically disconnect any circuit when repairs are being carried out.

What are fused switches used for?

Fused switches protect workers performing maintenance on part of an electrical circuit as well as preventing damage to the circuit itself. The advantage of using a fused switch over a non-fused switch is that it can provide a higher level of safety compared with unfused disconnectors, as the fuse blows in the event of breaches such as short circuits or overcurrent. This makes it certain that that part of the circuit cannot have current flowing through it while being worked on.

Types of fused switches

Fused switches mainly differ depending on the type of fuses they house, the number of poles they have, and the terminal type.


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Description Price Normal State Configuration Fused/Non-Fused Number of Poles Range Series Throw Configuration Enclosed/Not Enclosed Mechanical Fuse Size Fuse Current Rating Auxiliary Contacts Available Maximum Current Electrical Phase Terminal Type Mounting Type
New
RS Stock No. 216-5960
Mfr. Part No.3NP1143-1BC10
BrandSiemens
£169.91
Each
Units
- Fused 3 SENTRON 3NP11 - - NH0, NH1 - - 250A - - -
New
RS Stock No. 218-3234
Mfr. Part No.3KD5040-0RE20-0
BrandSiemens
£1,884.96
Each
Units
- Fused 4 SENTRON 3KD4 - - - - - 1000A - - -
New
RS Stock No. 218-3221
Mfr. Part No.3KD4240-0PE10-0
BrandSiemens
£457.52
Each
Units
- Fused 4 SENTRON 3KD4 - - - - - 400A - - -
New
RS Stock No. 218-3206
Mfr. Part No.3KD3640-0PE10-0
BrandSiemens
£256.64
Each
Units
- Fused 4 SENTRON 3KD3 - - - - - 200A - - -
New
RS Stock No. 212-5723
Mfr. Part No.3KD3230-2NE20-0
BrandSiemens
£131.22
Each
Units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 2 125A - 125A - - -
New
RS Stock No. 213-1382
Mfr. Part No.3LD2504-1TP51
BrandSiemens
£66.51
Each
Units
- Non-fused 3 SENTRON 3LD Single Throw Enclosed Size 3 63A - 63A - - -
RS Stock No. 203-9645
Mfr. Part No.5SG7163
BrandSiemens
£113.96
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 179-9647
Mfr. Part No.36153010
BrandSocomec
£194.75
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3216
Mfr. Part No.3KD4040-0PE20-0
BrandSiemens
£381.42
Each
Units
- Fused 4 SENTRON 3KD4 - - - - - 315A - - -
New
RS Stock No. 218-3228
Mfr. Part No.3KD4640-0QE10-0
BrandSiemens
£832.74
Each
Units
- Fused 4 SENTRON 3KD4 - - - - - 630A - - -
RS Stock No. 204-1572
Mfr. Part No.P1-32/SE1/SVB
BrandEaton
£145.71
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3164
Mfr. Part No.3KD2240-2ME20-0
BrandSiemens
£75.84
Each
Units
- Fused 4 SENTRON 3DK2 - - - - - 32A - - -
New
RS Stock No. 212-5805
Mfr. Part No.3LD3150-0TL11
BrandSiemens
£35.28
Each
Units
- - 4 SENTRON 3LD3 Single Throw Enclosed - 25A - 25A - - -
New
RS Stock No. 211-0129
Mfr. Part No.3KF1408-0MB11
BrandSiemens
£229.05
Each
Units
- Fused 4 SENTRON 3KF - Enclosed NH00, NH000 11 800A - 80A - - -
New
RS Stock No. 218-3233
Mfr. Part No.3KD5040-0RE10-0
BrandSiemens
£1,884.96
Each
Units
- Fused 4 SENTRON 3KD4 - - - - - 1000A - - -
New
RS Stock No. 218-3205
Mfr. Part No.3KD3640-0NE20-0
BrandSiemens
£207.08
Each
Units
- Fused 4 SENTRON 3KD3 - - - - - 200A - - -
New
RS Stock No. 213-1381
Mfr. Part No.3LD2405-0TK11
BrandSiemens
£327.71
Each
Units
3P Non-fused 3 SENTRON 3LD Single Throw Enclosed Size 5 250A - 250A - - -
RS Stock No. 203-9644
Mfr. Part No.5SG7123
BrandSiemens
£93.02
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3162
Mfr. Part No.3KD2240-2ME10-0
BrandSiemens
£75.84
Each
Units
- Fused 4 SENTRON 3DK2 - - - - - 32A - - -
New
RS Stock No. 212-5804
Mfr. Part No.3LD3150-0TK11
BrandSiemens
£24.68
Each
Units
3P - 3 SENTRON 3LD3 Single Throw Enclosed - 25A - 25A - - -