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

50973 Products showing for Fuses & Circuit Breakers

669 of 999+
Mersen 40A Bolted Tag Fuse, A3, 240 V dc, 415V ac, 73mm
  • RS Stock No. 178-1026
  • Mfr. Part No. N1045270 / BTIS42V40
Each (In a Pack of 10)
£10.718
Eaton RCBO, 40A Current Rating, 1+N Poles, 100mA Trip Sensitivity, Type C, xEffect Range
  • RS Stock No. 251-875
  • Mfr. Part No. 193526 FRBmM-C40/1N/01-F
Each
£178.57
Schneider Electric, ComPacT MCCB 4P 400A, Fixed Mount
  • RS Stock No. 260-8175
  • Mfr. Part No. C40W46E400
Each
£6,030.48
Better World
Schneider Electric Acti 9 iC60H MCB, 4P, 6A Curve B, 440V AC, 220 → 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3247
  • Mfr. Part No. A9F53406
Each
£196.93
Hager NFN MCB, 2P, 50A Curve C, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4718
  • Mfr. Part No. NFN250
Each
£143.97
Better World
Schneider Electric Auto Recloser for use with 4P iID
  • RS Stock No. 221-1102
  • Mfr. Part No. A9C70344
Each
£647.32
Eaton Fuse Puller Fuse Puller
  • RS Stock No. 261-727
  • Mfr. Part No. FP-6
Each
£103.74
Siemens 400V (Volts) Remote Switch Circuit Trip for use with Remote Control Switch
  • RS Stock No. 613-342
  • Mfr. Part No. 5TT4152-0
Each
£136.66
Better World
Schneider Electric Acti 9 Acti9 iDT40N MCB, 3P, 16A Curve C, 400V AC
  • RS Stock No. 238-3371
  • Mfr. Part No. A9P24316
Each
£135.77
Schneider Electric EasyPact Electronic Circuit Breaker 16A, Plug In
  • RS Stock No. 122-455
  • Mfr. Part No. LV510330P
Each
£111.97
ABB S800S MCB, 3P, 50A Curve C, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-661
  • Mfr. Part No. 2CCS863001R0504
Each
£270.13
RS PRO PC Board Non Resettable Fuse, Radial 160mA, 250V
  • RS Stock No. 767-5178
Each (In a Pack of 10)
£0.259
Hager RCBO, 40A Current Rating, 4P Poles, 30mA Trip Sensitivity, Type A
  • RS Stock No. 602-212
  • Mfr. Part No. ADX490C
Each
£559.38
Schneider Electric, ComPacT MCCB 3P 570A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 341-520
  • Mfr. Part No. C63F37E570
Each
£9,600.53
Better World
Siemens SENTRON Box Terminal for use with 3VA1 100/160
  • RS Stock No. 210-3516
  • Mfr. Part No. 3VA9154-0JA11
Each
£19.97
Schneider Electric, ComPacT Circuit Breaker Accessory 3, 4, Fixed Mount
  • RS Stock No. 654-990
  • Mfr. Part No. 33511
Each
£1,581.24
Neozed Sicherungssockel D02, 1P, 63A, 40
  • RS Stock No. 537-822
  • Mfr. Part No. R9J02163
Each
£12.17
Better World
Schneider Electric Horizontal Distribution Busbar Trunking, 3m, 100A, Canalis KS Series
  • RS Stock No. 211-0451
  • Mfr. Part No. KSA100ED4306
Each
£508.21
Eaton Eaton Moeller NZM Door Coupling Handle for use with N(S)2, NZM2
  • RS Stock No. 243-479
  • Mfr. Part No. 100684 NZM2-XTVDV-NA
Each
£96.94
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 3 channels
  • RS Stock No. 156-805
  • Mfr. Part No. 3VA2440-5HM32-0AA0
Each
£1,775.84
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Guides & Articles

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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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