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. 218-3294
Mfr. Part No.3LD2044-1TL53
BrandSiemens
SGD90.99
Each
units
- Fused 4 SENTRON 3LD - - - - - 16A - - -
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 - - -
New
RS Stock No. 212-5800
Mfr. Part No.3LD2830-0TK13
BrandSiemens
SGD229.88
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 125A - 125A - - -
New
RS Stock No. 212-5818
Mfr. Part No.3LD3430-0TL11
BrandSiemens
SGD116.55
Each
units
- - 4 SENTRON 3LD3 Single Throw Enclosed - 63A - 63A - - -
New
RS Stock No. 218-3166
Mfr. Part No.3KD2640-2ME10-0
BrandSiemens
SGD157.26
Each
units
- Fused 4 SENTRON 3KD2 - - - - - 63A - - -
New
RS Stock No. 212-0289
Mfr. Part No.VBF3GE
SGD161.08
Each
units
- - 3 TeSys VBF - Enclosed - 63A - 50A - - -
New
RS Stock No. 218-3217
Mfr. Part No.3KD4042-0PE10-0
BrandSiemens
SGD815.49
Each
units
- Fused 4 SENTRON 3KD4 - - - - - 315A - - -
New
RS Stock No. 211-4104
Mfr. Part No.3KF2312-0LF11
BrandSiemens
SGD414.68
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 125A - 125A - - -
New
RS Stock No. 212-5732
Mfr. Part No.3KD4030-0PE10-0
BrandSiemens
SGD630.24
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 3 315A - 315A - - -
New
RS Stock No. 212-5726
Mfr. Part No.3KD3630-0NE10-0
BrandSiemens
SGD341.61
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 2 200A - 200A - - -
RS Stock No. 204-1567
Mfr. Part No.P1-25/SE1/SVB
BrandEaton
SGD275.87
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 212-5762
Mfr. Part No.3KF3325-2LF11
BrandSiemens
SGD845.80
Each
units
3P Fused 3 SENTRON 3KD Single Throw Enclosed Size 3 250A - 250A - - -
New
RS Stock No. 218-3297
Mfr. Part No.3LD2064-1TC53
BrandSiemens
SGD115.20
Each
units
- Fused 4 SENTRON 3LD - - - - - 16A - - -
New
RS Stock No. 219-8280
Mfr. Part No.A9N15635
SGD18.76
Each
units
- Fused 1 Acti 9 A9N1 - - 8.5 x 31.5mm 10A - - - - -
New
RS Stock No. 218-3272
Mfr. Part No.3KF3325-0MF11-8AA1
BrandSiemens
SGD698.74
Each
units
- Fused 3 SENTRON 3KF - - NH0, NH1 - - 250A - - -
New
RS Stock No. 218-3283
Mfr. Part No.3KF5380-2LF11
BrandSiemens
SGD2,712.57
Each
units
- Fused 3 SENTRON 3KF - - NH2, NH3 - - 800A - - -
New
RS Stock No. 212-5784
Mfr. Part No.3LD2154-0TK51
BrandSiemens
SGD63.57
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 2 25A - 25A - - -
RS Stock No. 710-0592
Mfr. Part No.OS160GB03P 1SCA115413R1001
BrandABB
SGD528.36
Each
units
- - 3P - - - - A2, A3, A4 - Yes 160 A 3 - DIN Rail
New
RS Stock No. 211-4112
Mfr. Part No.3KL5530-1AB01
BrandSiemens
SGD1,329.89
Each
units
- Fused 3 SENTRON 3KL - - 1, 2 - - 250A - - -
New
RS Stock No. 218-3310
Mfr. Part No.3NP5060-0CA00
BrandSiemens
SGD413.75
Each
units
- Fused 3 SENTRON 3NP506 - - NH00, NH000 - - 160A - - -