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

51057 Products showing for Fuses & Circuit Breakers

624 of 999+
Hager BDF RCCB, 40A, 3P+N Pole, 30mA, Type F
  • RS Stock No. 602-172
  • Mfr. Part No. BDF440F
Each
£397.23
Better World
Schneider Electric Acti 9 iC60H MCB, 4P, 32A Curve D, 440V AC, 220 → 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 790-8737
  • Mfr. Part No. A9F55432
Each
£192.46
Schneider Electric Acti9 Busbar, 415V ac, 18mm Pitch
  • RS Stock No. 446-858
  • Mfr. Part No. A9XPH206
1 Pack of 10
£158.88
Schurter Inline Fuse Holder for 5 x 20mm Fuse
  • RS Stock No. 866-2697
  • Mfr. Part No. 0031.3560
Each (In a Pack of 100)
£1.478
Rockwell Automation FB100 Busbar, 1000V
  • RS Stock No. 281-5994
  • Mfr. Part No. FB100864Q1
Each (In a Pack of 2)
£51.66
RS PRO 25A Slow-Blow Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 188-4487
1 Box of 1000
£6,055.09
Eaton Eaton Distribution Parts 1 Phase Busbar, 500V, 27mm Pitch
  • RS Stock No. 231-340
  • Mfr. Part No. 113135 Z-SV-35/1P
Each
£31.80
Eaton xEffect MCB, 1+N, 8A Curve D
  • RS Stock No. 230-1061
  • Mfr. Part No. 177528 FAZ6-D8/1N
Each
£29.18
Schneider Electric, PowerPact MCCB 1P 50A, Breaking Capacity 65 kA, Clip-On
  • RS Stock No. 429-503
  • Mfr. Part No. BJF16050
Each
£568.49
Eaton xEffect - FRCmM RCCB, 16A, 4 Pole, 100mA, Type A, 240/415V ac
  • RS Stock No. 123-240
  • Mfr. Part No. 170337 FRCMM-16/4/01-A
Each
£175.28
ABB S302 MCB, 2P, 40A Curve C, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-756
  • Mfr. Part No. 2CDS382001R0404
Each
£82.61
Allen Bradley 140MT Three Phase Busbar, 45mm Pitch
  • RS Stock No. 273-2321
  • Mfr. Part No. 140MT-C-W454
Each
£14.08
Mersen 32A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 188-7325
  • Mfr. Part No. W216656
Each (In a Pack of 10)
£2.342
Schurter Non-Resettable Fuse Kit
  • RS Stock No. 167-6210
  • Mfr. Part No. 0034.9877
Each
£130.15
SIB Copper Earth Bar L. 78mm x W. 35mm x H. 46mm 5 Ways
  • RS Stock No. 270-5239
  • Mfr. Part No. P04350
1 Box of 10
£43.87
ABB System Pro M Compact S300P MCB, 1+N, 8A Curve C, 240V AC, 72V DC, 25 kA Breaking Capacity
  • RS Stock No. 204-214
  • Mfr. Part No. 2CDS381103R0084
Each
£57.69
Better World
Siemens SENTRON 3VA1 MCB, 1P, 63A
  • RS Stock No. 224-7871
  • Mfr. Part No. 3VA1163-3ED16-0AA0
Each
£94.71
ABB RCBO, 16A Current Rating, 3P Poles, 30mA Trip Sensitivity, Type B, System Pro M Compact Range
  • RS Stock No. 767-4412
  • Mfr. Part No. 2CSR273001R1165 DS203 M AC-B16/0,03
Each
£254.82
Better World
Schneider Electric RCBO, 16A Current Rating, 1P+N Poles, 300mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 191-6076
  • Mfr. Part No. A9DA6616
Each
£266.95
Rockwell Automation 1492-SP 1492-SPM MCB, 1P, 8A Curve C
  • RS Stock No. 218-8738
  • Mfr. Part No. 1492-SPM1C080
Each (In a Pack of 2)
£19.09
Results per page
1
624
2553

Guides & Articles

Article image
RCBOs Guide
There are many things to consider when choosing the right RCBO. Find out more in our comprehensive RCBOs guide.
Read more
Article image
Fuses Guide
Our fuses guide explains what they are, what they are used for, how they work, and the different types available.
Read more
Article image
Distribution Boards Guide
Our distribution boards guide explains what they are, their uses and types, and how to connect distribution boards.
Read more
Article image
MCBs Guide
What are MCBs and how do they work? Discover all you need to know in our comprehensive guide.
Read more

Related links