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

50958 Products showing for Fuses & Circuit Breakers

166 of 999+
Siemens SENTRON 2 Phase Busbar
  • RS Stock No. 187-5196
  • Mfr. Part No. 5ST3734
Each
£10.54
Eaton 4A Bolted Tag Fuse, A2, 550V ac, 73mm
  • RS Stock No. 181-8886
  • Mfr. Part No. AAO4
Each
£8.84
Eaton xEffect MCB, 1P, 32A Curve B, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4444
  • Mfr. Part No. 239025 FAZ6-B32/1
Each
£20.67
Martindale Drummond Busbar Connector, 600V ac
  • RS Stock No. 122-5529
  • Mfr. Part No. GCK/F/GKIT1
Each
£143.83
Bulgin 10A Inline Fuse Holder for 6.3 x 25mm Fuse, 250V ac
  • RS Stock No. 408-404
  • Mfr. Part No. FX0280
Each (In a Pack of 5)
£5.602
Lovato ModuLo P2MB MCB, 1P, 100A Curve C, 230V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 825-6141
  • Mfr. Part No. P2MB1PC100
Each
£79.16
Schurter 100mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 777-7467
  • Mfr. Part No. 0034.1506
Each (In a Pack of 10)
£1.298
Littelfuse 12A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 787-4299
  • Mfr. Part No. 0326012.MXP
Each (In a Pack of 5)
£1.744
Mersen 1A Slow-Blow Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 247-2882
  • Mfr. Part No. R302787
1 Box of 10
£88.20
RS PRO 10A T Ceramic Cartridge Fuse, 6.3 x 25mm
  • RS Stock No. 174-7959
Each (In a Box of 500)
£0.17
Better World
Schneider Electric Acti 9 1, 3 Phase Extension Box
  • RS Stock No. 125-1410
  • Mfr. Part No. SEA9BNEXN
Each
£245.21
Europa RCBO, 32A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type A, EUBLMC Range
  • RS Stock No. 210-4732
  • Mfr. Part No. EUBLMC32B30A
Each
£47.34
ABB RCBO, 40A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, System Pro M Compact Range
  • RS Stock No. 136-7808
  • Mfr. Part No. 2CSR255051R1405 DSE201 B40 AC30 - N Blue
Each
£72.12
Better World
Siemens SENTRON 5SY4 MCB, 2P, 13A Curve D, 400V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-6591
  • Mfr. Part No. 5SY4213-8
Each
£57.20
SIBA 16A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 768-6121
  • Mfr. Part No. 5021526.16
Each
£11.72
Socomec 4A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 122-5263
  • Mfr. Part No. 60120004
Each (In a Pack of 10)
£0.869
Schurter CBE Thermal Circuit Breaker - TA35 2 Pole 240V ac Voltage Rating Snap-In, 20A Current Rating
  • RS Stock No. 269-3826
  • Mfr. Part No. 4435.0189
Each
£17.37
Mersen 25A Slow-Blow Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 247-2711
  • Mfr. Part No. C213603
1 Box of 10
£22.63
Socomec 16A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 122-5266
  • Mfr. Part No. 60120016
Each (In a Pack of 10)
£0.869
WAGO 30A Fuse Holder for 10 x 38mm Fuse, 1P, 24V dc
  • RS Stock No. 279-1656
  • Mfr. Part No. 811-414
Each
£21.32
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RCBOs Guide
There are many things to consider when choosing the right RCBO. Find out more in our comprehensive RCBOs guide.
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Fuses Guide
Our fuses guide explains what they are, what they are used for, how they work, and the different types available.
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Distribution Boards Guide
Our distribution boards guide explains what they are, their uses and types, and how to connect distribution boards.
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MCBs Guide
What are MCBs and how do they work? Discover all you need to know in our comprehensive guide.
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