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

662 of 999+
Eaton Standard Series Distribution Board
  • RS Stock No. 125-784
  • Mfr. Part No. 174203 IKA-1/4-OT
Each
£26.42
Better World
Siemens SENTRON 5SL60 MCB, 1P + N, 25A Curve C, 230V AC, 60V DC, 6 kA Breaking Capacity
  • RS Stock No. 328-347
  • Mfr. Part No. 5SL6025-7KL
Each
£46.10
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 7A Current Rating
  • RS Stock No. 175-1458
  • Mfr. Part No. GV4LE07N
Each
£397.36
Schurter Panel Mount Fuse Holder for 5 x 20mm Fuse, 500V ac
  • RS Stock No. 123-8467
  • Mfr. Part No. 0031.1611
Each
£5.03
Hager RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type AC
  • RS Stock No. 251-2020
  • Mfr. Part No. ADC810F
Each
£214.63
Better World
Schneider Electric Multi 9 MCB, 2P, 20A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 219-9160
  • Mfr. Part No. M9F42220
Each
£125.09
Better World
Schneider Electric Easypact Cvs100...250, Easypact Cvs400...630, Nsx100...250, Nsx400...630 Cover for use with Vigi
  • RS Stock No. 221-1191
  • Mfr. Part No. LV429316
Each
£18.10
Eaton xEffect MCB, 1P, 25A Curve B, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-6977
  • Mfr. Part No. 278537 FAZ-B25/1
Each
£22.85
Better World
Schneider Electric, Compact MCCB 4P 25A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 178-7978
  • Mfr. Part No. LV426775
Each
£969.42
Littelfuse PC Board Non Resettable Fuse 125mA, 125V ac/dc
  • RS Stock No. 738-3068P
  • Mfr. Part No. 0251.125MAT1L
Each (Supplied as a Tape)
£1.331
Sensata Airpax Airpax Thermal Circuit Breaker - LELK111 3 Pole Panel Mount, 30A Current Rating
  • RS Stock No. 275-0387
  • Mfr. Part No. LELK111-1-63F-30.0-U-01-V
1 Box of 5
£919.09
Siemens Fuse Holder Fuse Holder
  • RS Stock No. 627-042
  • Mfr. Part No. 5SG1812
1 Pack of 10
£220.29
3M Earthing Kit W. 16mm x
  • RS Stock No. 285-6231
  • Mfr. Part No. 7000032608
1 Box of 50
£274.35
Better World
Schneider Electric Acti 9 A9F9 MCB, 4P, 16A Curve K, 400V AC, 250V DC, 20 kA, 15 kA Breaking Capacity
  • RS Stock No. 211-2513
  • Mfr. Part No. A9F95416
Each
£236.34
Allen Bradley 1694 Electronic Circuit Protectors Electronic Circuit breaker 1A 24V 1694-PM, 1 channels , Symmetrical
  • RS Stock No. 218-8905
  • Mfr. Part No. 1694-PM11
Each (In a Pack of 4)
£49.46
Schneider Electric, ComPacT MCCB 3P 1.6kA, Breaking Capacity 42 kA, Fixed Mount
  • RS Stock No. 429-181
  • Mfr. Part No. C160H35EFM
Each
£6,081.64
Eaton 2A gG/gL Cartridge Fuse, 22.2 x 58mm
  • RS Stock No. 228-990
  • Mfr. Part No. C22G2
1 Pack of 10
£33.41
Better World
Schneider Electric, Compact MCCB 3P 160A, Breaking Capacity 70 kA, Clip-On
  • RS Stock No. 178-7807
  • Mfr. Part No. LV426559
Each
£695.51
Better World
Schneider Electric MCCB 3P, Fixed Mount
  • RS Stock No. 178-7891
  • Mfr. Part No. LV426946
Each
£24.13
ABB RCBO, 32A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, System Pro M Compact Range
  • RS Stock No. 914-4061
  • Mfr. Part No. 2CSR255051R1324 DSE201 C32 AC30 - N Blue
Each
£69.72
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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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