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. 726-4778
Mfr. Part No.125KXTNC2F
BrandEaton
MYR5,700.75
Each
units
- - 3P + N - - - - SB3, SB4, SD6, SO - - 125 A 3 - -
RS Stock No. 781-3825
Mfr. Part No.3831 3006
BrandSocomec
MYR986.07
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 212-5822
Mfr. Part No.3LD3450-0TK11
BrandSiemens
MYR297.50
Each
units
3P - 3 SENTRON 3LD3 Single Throw Enclosed - 63A - 63A - - -
New
RS Stock No. 213-1366
Mfr. Part No.3NP1133-1BC10
BrandSiemens
MYR316.98
Each
units
- Fused 3 SENTRON 3NP11 - - NH00, NH000 - - 160A - - -
RS Stock No. 202-7250
Mfr. Part No.5SG7611-0KK06
BrandSiemens
MYR89.979
Each (In a Pack of 12)
units
- - - - - - - - - - - - - -
New
RS Stock No. 216-5962
Mfr. Part No.3NP1143-1DA11
BrandSiemens
MYR1,147.88
Each
units
- Fused 3 SENTRON 3NP11 - - NH0, NH1 - - 250A - - -
New
RS Stock No. 218-3201
Mfr. Part No.3KD3442-0NE10-0
BrandSiemens
MYR1,184.73
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 160A - - -
New
RS Stock No. 219-8308
Mfr. Part No.DF14N
MYR81.615
Each (In a Pack of 6)
units
- Fused 1 TeSys DF14 - - 14 x 51mm 50A - - - - -
RS Stock No. 136-5277
BrandRS PRO
MYR893.58
Each
units
6NO - 6 - - 6PST - - - - 63A 3 - Wall Mount
New
RS Stock No. 218-3229
Mfr. Part No.3KD4640-0QE20-0
BrandSiemens
MYR4,954.82
Each
units
- Fused 4 SENTRON 3KD4 - - - - - 630A - - -
New
RS Stock No. 218-3273
Mfr. Part No.3KF3325-0MF51
BrandSiemens
MYR3,254.33
Each
units
- Fused 3 SENTRON 3KF - - NH0, NH1 - - 250A - - -
New
RS Stock No. 212-5801
Mfr. Part No.3LD2866-0TB51
BrandSiemens
MYR2,132.52
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 4 125A - 125A - - -
New
RS Stock No. 218-3190
Mfr. Part No.3KD3242-0NE10-0
BrandSiemens
MYR1,084.69
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 125A - - -
New
RS Stock No. 213-1369
Mfr. Part No.3NP1143-1DA20
BrandSiemens
MYR846.20
Each
units
- Fused 3 SENTRON 3NP11 - - NH0, NH1 - - 250A - - -
New
RS Stock No. 218-3204
Mfr. Part No.3KD3640-0NE10-0
BrandSiemens
MYR1,232.12
Each
units
- Fused 4 SENTRON 3KD3 - - - - - 200A - - -
New
RS Stock No. 211-4106
Mfr. Part No.3KF2316-0LF11
BrandSiemens
MYR1,321.64
Each
units
- Fused 3 SENTRON 3KF - - NH00, NH000 - - 160A - - -
RS Stock No. 204-1585
Mfr. Part No.T0-2-8900/SE1/SVB
BrandEaton
MYR924.78
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 212-5781
Mfr. Part No.3LD2130-0TK11
BrandSiemens
MYR157.96
Each
units
3P - 3 SENTRON 3LD Single Throw Enclosed Size 2 25A - 25A - - -
RS Stock No. 534-5178
Mfr. Part No.MGFA1003C
MYR4,963.54
Each
units
- - - - - - - - - - - - - -
RS Stock No. 182-8463
Mfr. Part No.57035013
BrandSocomec
MYR476.67
Each
units
- - - - - - - - - - - - - -