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. 781-3847
Mfr. Part No.3831 3012
BrandSocomec
SGD370.70
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3257
Mfr. Part No.3KF1403-0LB11
BrandSiemens
SGD336.50
Each
units
- Fused 4 SENTRON 3KF - - NH00, NH000 - - 32A - - -
New
RS Stock No. 212-5799
Mfr. Part No.3LD2814-0TK53
BrandSiemens
SGD277.67
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 125A - 125A - - -
New
RS Stock No. 212-5819
Mfr. Part No.3LD3440-0TK11
BrandSiemens
SGD122.03
Each
units
3P - 3 SENTRON 3LD3 Single Throw Enclosed - 63A - 63A - - -
RS Stock No. 204-1575
Mfr. Part No.P3-63/SE3/SVB
BrandEaton
SGD457.92
Each
units
3NO Fused 3 Main Switch, Maintenance Switch, Switch Disconnector P3 - Enclosed - 80A - - - - -
New
RS Stock No. 218-3261
Mfr. Part No.3KF1408-0LB11
BrandSiemens
SGD477.27
Each
units
- Fused 4 SENTRON 3KF - - NH00, NH000 - - 80A - - -
New
RS Stock No. 218-3267
Mfr. Part No.3KF2412-0LF11
BrandSiemens
SGD489.29
Each
units
- Fused 4 SENTRON 3KF - - NH00, NH000 - - 125A - - -
New
RS Stock No. 218-3209
Mfr. Part No.3KD3642-0NE10-0
BrandSiemens
SGD463.54
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 200A - - -
New
RS Stock No. 218-3263
Mfr. Part No.3KF2312-2LF11
BrandSiemens
SGD478.99
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 - - 125A - - -
RS Stock No. 726-4778
Mfr. Part No.125KXTNC2F
BrandEaton
SGD1,695.51
Each
units
- - 3P + N - - - - SB3, SB4, SD6, SO - - 125 A 3 - -
New
RS Stock No. 216-5955
Mfr. Part No.3LD2305-1TL11
BrandSiemens
SGD744.80
Each
units
- Fused 4 SENTRON 3LD - - - - - 160A - - -
New
RS Stock No. 217-6839
Mfr. Part No.3KF3325-0LF11
BrandSiemens
SGD698.74
Each
units
- Fused 3 SENTRON 3KF - - NH0, NH1 - - 250A - - -
New
RS Stock No. 212-5723
Mfr. Part No.3KD3230-2NE20-0
BrandSiemens
SGD275.84
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 2 125A - 125A - - -
RS Stock No. 204-1565
Mfr. Part No.P1-25/SE1
BrandEaton
SGD241.19
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 213-1369
Mfr. Part No.3NP1143-1DA20
BrandSiemens
SGD246.43
Each
units
- Fused 3 SENTRON 3NP11 - - NH0, NH1 - - 250A - - -
New
RS Stock No. 218-3296
Mfr. Part No.3LD2054-1TL53
BrandSiemens
SGD69.87
Each
units
- Fused 4 SENTRON 3LD - - - - - 16A - - -
RS Stock No. 202-7126
Mfr. Part No.5SG7611-0KK16
BrandSiemens
SGD28.873
Each (In a Pack of 12)
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3218
Mfr. Part No.3KD4230-0PE10-0
BrandSiemens
SGD710.76
Each
units
- Fused 3 SENTRON 3KD4 - - - - - 4000A - - -
RS Stock No. 762-2452
Mfr. Part No.OS100TPN-B
BrandABB
SGD1,350.78
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 212-5844
Mfr. Part No.5SG7234-1
BrandSiemens
SGD191.81
Each
units
3P Fused 3 MINIZED 5SG Single Throw - D02 63A - 63A - - -