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

646 of 999+
nVent ERICO Earth Bar
  • RS Stock No. 277-6238
  • Mfr. Part No. EEB08C506D0A
Each
£209.92
Better World
Siemens, SENTRON MCCB 3P 320A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-3483
  • Mfr. Part No. 3VA1332-5MH32-0AA0
Each
£955.80
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 874-4193
  • Mfr. Part No. 3VA1116-3ED36-0AA0
Each
£379.47
Eaton xEffect MCB, 1P, 4A Curve C, 240 → 415V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-6894
  • Mfr. Part No. 102082 FAZ-C4/1-NA
Each
£35.18
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 70A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-540
  • Mfr. Part No. 3VA5270-7EC41-2AA0
Each
£943.14
Better World
Siemens RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type B, Sentron Range
  • RS Stock No. 243-6140
  • Mfr. Part No. 5SU1324-6FP10
Each
£212.95
Schneider Electric R9PR RCCB, 63A, 4 Pole, 30mA, Type AC, 400V
  • RS Stock No. 276-8976
  • Mfr. Part No. R9PRC463
Each
£132.11
Schurter 16A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 500V ac
  • RS Stock No. 866-3609
  • Mfr. Part No. 0031.2322
Each
£11.01
Siemens 6A F Cartridge Fuse, 10 x 38mm
  • RS Stock No. 203-2061
  • Mfr. Part No. 3NW6001-1
Each (In a Pack of 10)
£3.575
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 150A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 268-459
  • Mfr. Part No. 3VA6115-5HL31-0AA0
Each
£788.04
ABB F200 RCCB, 125A, 4 Pole, 500mA, 400V ac
  • RS Stock No. 176-9631
  • Mfr. Part No. F204BS-125/0.5
Each
£5,569.78
Schurter 1A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 712-4740
  • Mfr. Part No. 0090.0001
Each
£17.27
Better World
Siemens SENTRON 5SY1 MCB, 1P, 10A, Type F2, 230V AC, 60V DC
  • RS Stock No. 210-3399
  • Mfr. Part No. 5SY1710-4
Each
£46.26
Schneider Electric, ComPacT MCCB 3P 320A, Fixed Mount
  • RS Stock No. 260-8095
  • Mfr. Part No. C40F3TM320D
Each
£1,265.66
Siemens RCBO, 63A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type A, SENTRON Range
  • RS Stock No. 211-9580
  • Mfr. Part No. 5SM2626-6
Each
£206.48
Mersen 63A Neutral Link for A3 Fuses
  • RS Stock No. 178-1172
  • Mfr. Part No. H239138 / BNEUTRALA3
Each (In a Pack of 10)
£2.717
Better World
Siemens SENTRON 5SL6 MCB, 3P, 32A Curve B, 6 kA Breaking Capacity
  • RS Stock No. 202-7049
  • Mfr. Part No. 5SL6332-6
Each
£65.90
Schneider Electric, ComPacT MCCB 4P 200A, Breaking Capacity 15 kA, Fixed Mount
  • RS Stock No. 429-407
  • Mfr. Part No. C25H6TM200
Each
£3,065.03
Schurter Thermal Magnetic Circuit Breaker - Single Pole 48 V dc, 240V ac Voltage Rating, 10A Current Rating
  • RS Stock No. 539-3745
  • Mfr. Part No. 4404.0004
Each
£2.97
Lovato ModuLo P1MB MCB, 1P, 16A Curve C, 230V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 825-5592
  • Mfr. Part No. P1MB1PC16
Each
£16.72
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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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