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. 218-3187
Mfr. Part No.3KD3240-0NE20-0
BrandSiemens
€170.00
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 125A - - -
New
RS Stock No. 213-1365
Mfr. Part No.3NP1123-1JC20
BrandSiemens
€71.60
Each
units
- Fused 3 SENTRON 3NP11 - - NH000 - - 160A - - -
RS Stock No. 762-2468
Mfr. Part No.OS200TPN-A OS200TPN-A
BrandABB
€1,185.50
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 212-5800
Mfr. Part No.3LD2830-0TK13
BrandSiemens
€141.22
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 125A - 125A - - -
New
RS Stock No. 218-3261
Mfr. Part No.3KF1408-0LB11
BrandSiemens
€278.00
Each
units
- Fused 4 SENTRON 3KF - - NH00, NH000 - - 80A - - -
New
RS Stock No. 218-3273
Mfr. Part No.3KF3325-0MF51
BrandSiemens
€526.00
Each
units
- Fused 3 SENTRON 3KF - - NH0, NH1 - - 250A - - -
RS Stock No. 686-7391
Mfr. Part No.OS32FB22A1N1 1SCA108853R1001
BrandABB
€149.44
Each
units
- - 4P - - - - A1 - Yes 32 A 3 Screw DIN Rail
New
RS Stock No. 218-3266
Mfr. Part No.3KF2316-2LF11
BrandSiemens
€303.00
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 - - 160A - - -
RS Stock No. 136-5277
BrandRS PRO
€164.68
Each
units
6NO - 6 - - 6PST - - - - 63A 3 - Wall Mount
New
RS Stock No. 218-3293
Mfr. Part No.3LD2030-1TL13
BrandSiemens
€35.10
Each
units
- Fused 4 SENTRON 3LD - - - - - 16A - - -
New
RS Stock No. 212-5811
Mfr. Part No.3LD3250-0TL11
BrandSiemens
€50.83
Each
units
- - 4 SENTRON 3LD3 Single Throw Enclosed - 32A - 32A - - -
RS Stock No. 726-4813
Mfr. Part No.203GNC
BrandEaton
€1,214.30
Each
units
- - 3P + N - - - - SF3, SF6 - - 200A 3 - -
New
RS Stock No. 212-5736
Mfr. Part No.3KD4830-0QE20-0
BrandSiemens
€1,095.86
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 4 800A - 800A - - -
RS Stock No. 781-3787
Mfr. Part No.3631 4002
BrandSocomec
€94.26
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3215
Mfr. Part No.3KD4040-0PE10-0
BrandSiemens
€431.00
Each
units
- Fused 4 SENTRON 3KD4 - - - - - 315A - - -
New
RS Stock No. 218-3272
Mfr. Part No.3KF3325-0MF11-8AA1
BrandSiemens
€407.00
Each
units
- Fused 3 SENTRON 3KF - - NH0, NH1 - - 250A - - -
New
RS Stock No. 218-3253
Mfr. Part No.3KF1306-4RB11
BrandSiemens
€197.00
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 - - 63A - - -
New
RS Stock No. 212-5804
Mfr. Part No.3LD3150-0TK11
BrandSiemens
€32.08
Each
units
3P - 3 SENTRON 3LD3 Single Throw Enclosed - 25A - 25A - - -
New
RS Stock No. 218-3257
Mfr. Part No.3KF1403-0LB11
BrandSiemens
€196.00
Each
units
- Fused 4 SENTRON 3KF - - NH00, NH000 - - 32A - - -
RS Stock No. 708-1747
Mfr. Part No.GS2DB3
€49.10
Each
units
- - 3P - - - - A1 - Yes - 3 Wire Lead -