Fuses & Circuit Breakers

Although they work in different ways, fuses and circuit breakers broadly have the same purpose; to protect electrical appliances and electrical circuits from short circuits, and excessive current (called overcurrent or overload).

Fuses

Fuses are relatively low cost electrical safety devices. If too much current enters the circuit, the fuse will burn out (sometimes called blowing out). When the fuse blows out it breaks the circuit. This protects the attached devices and allows you to touch devices without being electrocuted. When the fuse blows, it must be replaced before using the device or appliance again.

Circuit breakers

Circuit breakers work in a similar way to fuses, but they are resettable. Once a fault is detected (this is typically a short circuit or an excessive amount of current flowing through the circuit) the circuit breaker will interrupt the flow of current. When the circuit breaker trips, it's simply a case of flicking a switch to reset the circuit breaker. As soon as you've reset the circuit breaker, it is ready to use again.

Circuit Breakers
Circuit Breakers
Earth & Lightning Protection
Earth & Lightning Protection
Fuse Holders & Accessories
Fuse Holders & Accessories
Fuses
Fuses

51028 Products showing for Fuses & Circuit Breakers

2550 of 999+
Schneider Electric Resi9 R9F23 Circuit Breaker, 1P, 16A Curve B, 230V AC, 6000 A Breaking Capacity
  • RS Stock No. 655-494
  • Mfr. Part No. R9F23116
Each
£8.67
Siemens 2A Cartridge Fuse, 14 x 51mm
  • RS Stock No. 627-083
  • Mfr. Part No. 3NW8102-1
1 Pack of 10
£40.71
Schneider Electric PowerPact J Nut for use with Circuit Breaker
  • RS Stock No. 438-923
  • Mfr. Part No. S37427
1 Pack of 2
£90.50
Siemens SENTRON 5SY7 MCB, 4P, 32A Curve D, 400V AC, 60V DC, 25 kA Breaking Capacity
  • RS Stock No. 610-471
  • Mfr. Part No. 5SY7632-8
Each
£239.99
Hager CDS RCD Switch, 63A, 2 Pole, 30mA, Type AC, 230V
  • RS Stock No. 599-844
  • Mfr. Part No. CDS764F
Each
£129.68
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-470
  • Mfr. Part No. 3VA6560-7JT46-0AA0
Each
£4,841.52
Siemens ALPHA Assembly Kit for use with Terminal Block
  • RS Stock No. 629-177
  • Mfr. Part No. 8GK4110-8KK22
Each
£226.65
Siemens SENTRON 5SY8 MCB, 2P, 8A Curve D, 400V AC, 60V DC, 40 kA Breaking Capacity
  • RS Stock No. 610-563
  • Mfr. Part No. 5SY8208-8
Each
£134.99
Hager CDB RCD Switch, 40A, 4 Pole, 30mA, Type B, 230 → 400V
  • RS Stock No. 599-738
  • Mfr. Part No. CDB640F
Each
£951.45
Schneider Electric Linergy Busbar Connector, 690V
  • RS Stock No. 655-070
  • Mfr. Part No. LVS04413
Each
£1,006.38
Siemens ALPHA Installaton Accessory
  • RS Stock No. 627-039
  • Mfr. Part No. 8GK9920-0KK34
1 Pack of 5 Set(s)
£35.54
Siemens SENTRON 5SY8 MCB, 4P, 3A Curve D, 400V AC, 60V DC, 50 kA Breaking Capacity
  • RS Stock No. 610-658
  • Mfr. Part No. 5SY8403-8
Each
£269.99
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 270-051
  • Mfr. Part No. 3VA6110-7HN31-2AA0
Each
£787.26
SENTRON Mounting Plate for use with 3VA61/62 Series
  • RS Stock No. 264-001
  • Mfr. Part No. 3VA9248-0VK20
Each
£18.03
Hager BF RCCB, 25A, 2 Pole, 300mA, Type AC
  • RS Stock No. 602-184
  • Mfr. Part No. BF228
Each
£205.01
Hager Hager NSN Circuit Breaker, 4P, 63A Curve D, 415V AC, 15 kA Breaking Capacity
  • RS Stock No. 599-729
  • Mfr. Part No. NSN463
Each
£451.75
Siemens ALPHA Assembly Kit for use with 3VA1 Molded Case Circuit Breakers
  • RS Stock No. 629-309
  • Mfr. Part No. 8GK6730-4KK43
Each
£209.95
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-261
  • Mfr. Part No. 3VA6210-8KQ31-0AA0
Each
£2,326.19
Schneider Electric, ComPacT NSX Circuit breaker 1P 80A, Breaking Capacity 25 kA, Busbar System
  • RS Stock No. 654-192
  • Mfr. Part No. IL0801P252
Each
£166.58
Siemens ALPHA Base for use with ALPHA 630 DIN
  • RS Stock No. 629-059
  • Mfr. Part No. 8GK9900-0KK54
Each
£461.86
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MCBs Guide
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