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

108 of 999+
Eaton 20A Rail Mount Fuse Holder for E1 Fuse, 1P, 550V ac
  • RS Stock No. 221-566
  • Mfr. Part No. SC20HWH
Each
£11.13
Wickmann 10A Red Blade Car Fuse, 58V dc
  • RS Stock No. 174-0759
  • Mfr. Part No. 0997010.WXN
Each (In a Pack of 10)
£0.696
Better World
Siemens Sentron 5SY6 MCB, 1P, 16A Curve B, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 489-6697
  • Mfr. Part No. 5SY6116-6
Each
£15.87
RS PRO 2.5A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 911-3499
Each (In a Pack of 10)
£0.388
RS PRO 30A Slow-Blow Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 188-4612
Each
£7.68
SIBA 100A NH Fuse, NH000, 500V ac
  • RS Stock No. 421-722
  • Mfr. Part No. 20-000-13/100E1
Each (In a Pack of 3)
£7.897
ABB F200 RCCB, 125A, 4 Pole, 300mA, Type AC, 230V ac
  • RS Stock No. 225-6122
  • Mfr. Part No. 2CSF204001R3950 F204 AC-125/0,3
Each
£662.89
Better World
Schneider Electric Acti 9 iC60L MCB, 3P, 10A Curve C
  • RS Stock No. 247-1949
  • Mfr. Part No. A9F94310
Each
£158.36
ABB Tmax XT Undervoltage Release for use with XT1, XT4
  • RS Stock No. 237-6057
  • Mfr. Part No. 1SDA066392R1 UVR XT1..4 220-240VAC/DC
Each
£126.07
ABB SN201 MCB, 1+N, 16A Curve C, 230V AC, 4.5 kA Breaking Capacity
  • RS Stock No. 191-9457
  • Mfr. Part No. 2CSS245102R0164 SN201 L C16-L
Each
£10.12
Littelfuse 2A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-4410A
  • Mfr. Part No. 0217002.MXP
Each (In a Pack of 100)
£0.142
Better World
Schneider Electric RCBO, 10A Current Rating, 1P Poles, 30mA Trip Sensitivity, Acti9 Range
  • RS Stock No. 201-2246
  • Mfr. Part No. A9DF3610
Each
£266.22
ABB High Performance S800S MCB, 2P, 80A Curve D, 400V AC, 250V DC, 50 kA Breaking Capacity
  • RS Stock No. 435-453
  • Mfr. Part No. 2CCG001241R0001
Each
£208.71
RS PRO 4A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 668-6001
Each (In a Pack of 10)
£0.302
Better World
Schneider Electric Acti 9 iC60H MCB, 2P, 40A Curve D, 440V AC, 100 → 133V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3530
  • Mfr. Part No. A9F55240
Each
£86.87
Eaton 63A Rail Mount Fuse Holder
  • RS Stock No. 418-653
  • Mfr. Part No. RS63LOCK
Each (In a Pack of 3)
£13.273
Finder Busbar
  • RS Stock No. 123-2855
  • Mfr. Part No. 097.58
Each
£4.83
Mersen 6.3A FA Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 188-6681
  • Mfr. Part No. S084012
Each (In a Pack of 10)
£3.073
Better World
Schneider Electric Acti 9 iC60L MCB, 1P, 6A Curve C, 15 kA Breaking Capacity
  • RS Stock No. 219-9264
  • Mfr. Part No. A9F94106
Each
£84.48
Eaton Eaton Moeller NZM Door Coupling Handle for use with N(S)2, NZM2
  • RS Stock No. 256-769
  • Mfr. Part No. 271450 NZM2-XTVDVR-NA
Each
£103.74
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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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