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
RS Stock No. 781-3853
Mfr. Part No.3831 6015
BrandSocomec
SGD465.93
Each
units
- - - - - - - - - - - - - -
RS Stock No. 726-4737
Mfr. Part No.103GNC
BrandEaton
SGD1,736.44
Each
units
- - 3P + N - - - - - - - 100A 3 - -
RS Stock No. 781-3840
Mfr. Part No.3831 6012
BrandSocomec
SGD495.24
Each
units
- - - - - - - - - - - - - -
RS Stock No. 608-7570
Mfr. Part No.GK1EW
SGD255.65
Each
units
- - 3P - - - - 14 x 51mm - Yes 50A 1 Wire Lead -
New
RS Stock No. 218-3269
Mfr. Part No.3KF2416-0LF11
BrandSiemens
SGD539.08
Each
units
- Fused 4 SENTRON 3KF - - NH00, NH000 - - 160A - - -
New
RS Stock No. 218-3284
Mfr. Part No.3KF5463-0LF11
BrandSiemens
SGD2,695.40
Each
units
- Fused 4 SENTRON 3KF - - NH2, NH3 - - 630A - - -
RS Stock No. 203-2381
Mfr. Part No.5TE8112
BrandSiemens
SGD50.20
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 211-0195
Mfr. Part No.5SG7631-0KK06
BrandSiemens
SGD88.233
Each (In a Pack of 4)
units
- Fused 3 MINIZED 5SG - - D01 0.3A - 6A - - -
RS Stock No. 179-9657
Mfr. Part No.57025014
BrandSocomec
SGD127.38
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3203
Mfr. Part No.3KD3630-0PE10-0
BrandSiemens
SGD400.02
Each
units
- Fused 3 SENTRON 3KD3 - - - - - 200A - - -
New
RS Stock No. 212-5730
Mfr. Part No.3KD3632-0PE10-0
BrandSiemens
SGD506.02
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 3 200A - 200A - - -
New
RS Stock No. 218-3290
Mfr. Part No.3LD2003-1TL51
BrandSiemens
SGD68.50
Each
units
- Fused 4 SENTRON 3LD - - - - - 16A - - -
RS Stock No. 781-3856
Mfr. Part No.3831 3024
BrandSocomec
SGD898.98
Each
units
- - - - - - - - - - - - - -
RS Stock No. 727-5838
Mfr. Part No.OS400B03P 1SCA022719R0840
BrandABB
SGD1,330.22
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3275
Mfr. Part No.3KF3425-0MF11
BrandSiemens
SGD875.58
Each
units
- Fused 4 SENTRON 3KF - - NH0, NH1 - - 250A - - -
RS Stock No. 628-8098
Mfr. Part No.266006 & PN2-200
BrandEaton
SGD625.75
1 Box of 1
Box(es)
- - - - - - - - - - - - - -
New
RS Stock No. 212-5792
Mfr. Part No.3LD2530-0TK13
BrandSiemens
SGD103.03
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 3 63A - 63A - - -
New
RS Stock No. 213-1367
Mfr. Part No.3NP1133-1CA11
BrandSiemens
SGD263.06
Each
units
- Fused 3 SENTRON 3NP11 - - NH00, NH000 - - 160A - - -
New
RS Stock No. 218-3215
Mfr. Part No.3KD4040-0PE10-0
BrandSiemens
SGD739.95
Each
units
- Fused 4 SENTRON 3KD4 - - - - - 315A - - -
New
RS Stock No. 212-5785
Mfr. Part No.3LD2203-1TP51
BrandSiemens
SGD97.92
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 2 32A - 32A - - -