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. 218-3209
Mfr. Part No.3KD3642-0NE10-0
BrandSiemens
TWD10,786.00
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 200A - - -
New
RS Stock No. 212-5798
Mfr. Part No.3LD2814-0TK51
BrandSiemens
TWD6,092.00
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 125A - 125A - - -
RS Stock No. 535-0912
Mfr. Part No.MGFA0633C
TWD18,200.00
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3202
Mfr. Part No.3KD3442-2NE10-0
BrandSiemens
TWD9,827.00
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 160A - - -
RS Stock No. 727-5813
Mfr. Part No.OS250B04N2P 1SCA022750R7800
BrandABB
TWD21,474.00
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-3310
Mfr. Part No.3NP5060-0CA00
BrandSiemens
TWD9,627.00
Each
units
- Fused 3 SENTRON 3NP506 - - NH00, NH000 - - 160A - - -
RS Stock No. 707-6146
Mfr. Part No.2CSM200923R1801 E 91/32
BrandABB
TWD204.00
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 212-5797
Mfr. Part No.3LD2714-0TK53
BrandSiemens
TWD4,890.00
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 100A - 100A - - -
RS Stock No. 2509646450
Mfr. Part No.KKVM332CC Y/R
BrandAltech
TWD6,429.00
Each
units
- - - - - - - - - - - - - -