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. 218-3227
Mfr. Part No.3KD4630-0QE20-0
BrandSiemens
SGD1,292.76
Each
units
- Fused 3 SENTRON 3KD4 - - - - - 630A - - -
RS Stock No. 726-4911
Mfr. Part No.63GNC
BrandEaton
SGD1,263.79
Each
units
- - 3P + N - - - - SB3, SB4 - - 63A 3 - -
New
RS Stock No. 212-5798
Mfr. Part No.3LD2814-0TK51
BrandSiemens
SGD277.67
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 125A - 125A - - -
RS Stock No. 499-7201
Mfr. Part No.78640548 & T0-2-8900/E/EZ-P1(RS499-7201)
BrandEaton
SGD42.92
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3181
Mfr. Part No.3KD3040-2NE10-0
BrandSiemens
SGD264.39
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 100A - - -
New
RS Stock No. 219-8443
Mfr. Part No.VN12
SGD29.19
Each
units
- - 3 TeSys Mini-VARIO - - - 12A - 8.1A - - -
RS Stock No. 707-6158
Mfr. Part No.2CSM200883R1801 E 92/32
BrandABB
SGD24.63
Each
units
- - DP - - - - 10 x 38 mm - - 32 A 1 - -
New
RS Stock No. 218-3253
Mfr. Part No.3KF1306-4RB11
BrandSiemens
SGD338.21
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 - - 63A - - -
New
RS Stock No. 218-3234
Mfr. Part No.3KD5040-0RE20-0
BrandSiemens
SGD3,656.81
Each
units
- Fused 4 SENTRON 3KD4 - - - - - 1000A - - -
New
RS Stock No. 212-5738
Mfr. Part No.3KD5030-0RE10-0
BrandSiemens
SGD3,123.79
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 5 1000A - 1000A - - -
New
RS Stock No. 212-5806
Mfr. Part No.3LD3230-0TK11
BrandSiemens
SGD55.35
Each
units
3P - 3 SENTRON 3LD3 Single Throw Enclosed - 32A - 32A - - -
New
RS Stock No. 218-3169
Mfr. Part No.3KD2832-2NE10-0
BrandSiemens
SGD214.60
Each
units
- Fused 3 SENTRON 3KD2 - - - - - 80A - - -
New
RS Stock No. 212-5712
Mfr. Part No.3KD1630-2ME20-0
BrandSiemens
SGD108.33
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 1 16A - 16A - - -
New
RS Stock No. 218-3256
Mfr. Part No.3KF1308-2LB11
BrandSiemens
SGD449.81
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 - - 80A - - -
New
RS Stock No. 212-5815
Mfr. Part No.3LD3340-0TL11
BrandSiemens
SGD140.11
Each
units
- - 4 SENTRON 3LD3 Single Throw Enclosed - 40A - 40A - - -
New
RS Stock No. 212-0288
Mfr. Part No.VBF2GE
SGD98.20
Each
units
- - 3 TeSys VBF - Enclosed - 50A - 32A - - -
New
RS Stock No. 218-3276
Mfr. Part No.3KF4340-0MF11
BrandSiemens
SGD1,134.81
Each
units
- Fused 3 SENTRON 3KF - - NH1, NH2 - - 400A - - -
RS Stock No. 204-1567
Mfr. Part No.P1-25/SE1/SVB
BrandEaton
SGD279.33
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3186
Mfr. Part No.3KD3240-0NE10-0
BrandSiemens
SGD291.86
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 125A - - -
RS Stock No. 762-2455
Mfr. Part No.OS32TPN-A OS32TPN-A
BrandABB
SGD471.56
Each
units
- - - - - - - - - - - - - -