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

50957 Products showing for Fuses & Circuit Breakers

103 of 999+
Siemens 20A NH Fuse, NH000, 500V ac
  • RS Stock No. 395-793
  • Mfr. Part No. 3NA3807
Each (In a Pack of 3)
£6.093
Eaton xEffect MCB, 2P, 2A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4582
  • Mfr. Part No. 239097 FAZ6-C2/2
Each
£72.62
Phoenix Contact Busbar
  • RS Stock No. 332-5829
  • Mfr. Part No. 2966692
Each
£10.88
ABB Tmax XT Shunt Opening Release for use with Circuit Breaker
  • RS Stock No. 231-9365
  • Mfr. Part No. 1SDA104934R1 YO-C XT5-XT6 F/P 110.240Va
Each
£96.61
Better World
Schneider Electric 24V ac/dc Remote Tripping Device Circuit Trip for use with LR3D Series, LRD Series
  • RS Stock No. 744-6961
  • Mfr. Part No. LAD703B
Each
£71.70
SIBA 25A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 314-4838
  • Mfr. Part No. 50-179-06/25A
Each (In a Pack of 5)
£9.062
ABB High Performance S800S MCB, 3P, 80A Curve D, 400V AC, 250V DC, 50 kA Breaking Capacity
  • RS Stock No. 435-493
  • Mfr. Part No. 2CCG001244R0001
Each
£312.17
SIBA 125A White Automotive Car Fuse, 80V dc
  • RS Stock No. 161-1832
  • Mfr. Part No. 9005805.125
Each
£5.38
Contactum MCB, 1P, 16A Curve B, 250V AC, 6 kA Breaking Capacity
  • RS Stock No. 184-9056
  • Mfr. Part No. CPB16
Each
£3.28
Eaton 200A Bolted Tag Fuse, 415V ac, 82mm
  • RS Stock No. 181-8604
  • Mfr. Part No. 200MJ30-7
Each (In a Box of 10)
£37.206
Eaton 25A British Standard Fuse, A1, 440V ac, 44.5mm
  • RS Stock No. 414-651
  • Mfr. Part No. NIT20M25
Each (In a Pack of 5)
£7.894
Eaton 2A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9401
  • Mfr. Part No. S500-2-R
1 Bag of 1000
£146.49
Eaton MCB, 1+N, 25A Curve C
  • RS Stock No. 230-1079
  • Mfr. Part No. 264748 PLG4-C25/1N
Each
£12.61
Better World
ABB System Pro M Compact S200 MCB, 1P, 6A Curve D, 253V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 527-9453
  • Mfr. Part No. 2CDS251001R0061 S201-D6
Each
£17.22
Schneider Electric Thermal Circuit Breaker - GB2 Single Pole 277V ac Voltage Rating DIN Rail Mount, 5A Current Rating
  • RS Stock No. 312-3673
  • Mfr. Part No. GB2CB10
Each
£28.91
Littelfuse 125A Green Bolt Down Car Fuse, 32V dc
  • RS Stock No. 787-4413P
  • Mfr. Part No. 0298125.ZXEH
Each (Supplied in a Bag)
£5.85
Schneider Electric RCBO, 32A Current Rating, 1P Poles, Type B, Acti9 Range
  • RS Stock No. 245-144
  • Mfr. Part No. A9D56832
Each
£155.78
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 70 kA
  • RS Stock No. 210-1615
  • Mfr. Part No. 3VA1110-6EE42-0AA0
Each
£366.53
Phoenix Contact Mounting Base for use with CB Series
  • RS Stock No. 768-1139
  • Mfr. Part No. 2800929
Each
£11.56
Eaton 50A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 703-8469
  • Mfr. Part No. C22G50
Each (In a Pack of 10)
£3.528
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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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