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

50958 Products showing for Fuses & Circuit Breakers

2521 of 999+
Siemens ALPHA Busbar Support for use with ALPHA DIN Installation Distributor
  • RS Stock No. 272-0357
  • Mfr. Part No. 8GK9711-0KK07
Each
£38.49
Bourns Non Resettable Fuse 1.5A, 125V ac
  • RS Stock No. 191-4621
  • Mfr. Part No. SF-2410FP150T-2
Each (On a Tape of 10)
£0.371
Eaton IZMX/INX Terminal Kit for use with INX40…3…20F, INX40…3…25F, IZMX40…3…20F, IZMX40…3…25F
  • RS Stock No. 132-610
  • Mfr. Part No. 184175 IZMX-TF403-2500F-1
Each
£695.04
Bourns SMD Non Resettable Fuse 1.25A, 250V ac
  • RS Stock No. 186-0322
  • Mfr. Part No. SF-3812SP125T-2
1 Reel of 2500
£1,792.50
Mersen 1A Slow-Blow Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 247-2734
  • Mfr. Part No. E213605
1 Box of 10
£28.30
Siemens SENTRON Cover for use with 8WA
  • RS Stock No. 237-7978
  • Mfr. Part No. 8WA1860
Each (In a Pack of 50)
£0.444
Eaton RCBO, 25A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type A, Type B, FRBmM Range
  • RS Stock No. 123-682
  • Mfr. Part No. 170848 FRBMM-B25/2/03-A
Each
£132.53
Schneider Electric, ComPacT MCCB 3P 630A, Breaking Capacity 30 kA, Fixed Mount
  • RS Stock No. 341-259
  • Mfr. Part No. C063H35EFM
Each
£8,517.14
Eaton xEffect - FRCmM RCCB, 100A, 4 Pole, 300mA, Type A, 110V
  • RS Stock No. 127-435
  • Mfr. Part No. 180621 FRCMM-100/4/03-A-110
Each
£790.02
Eaton Eaton Distribution Parts 4 Phase Busbar, 415V
  • RS Stock No. 255-346
  • Mfr. Part No. 263110 Z-SV-35/3P+N-6TE
Each
£65.14
Eaton Eaton Distribution Parts Interference Suppression Component for use with Circuit Breaker
  • RS Stock No. 243-506
  • Mfr. Part No. 101428 Z-RC/230
Each
£54.51
Eaton PKE Electronic Circuit Breaker 65A
  • RS Stock No. 103-961
  • Mfr. Part No. 138258 PKE65
Each
£136.80
Mersen 125A NH Fuse, NH00, 400V ac
  • RS Stock No. 270-3031
  • Mfr. Part No. E223702
Each
£8.96
Legrand Circuit Breaker
  • RS Stock No. 266-1139
  • Mfr. Part No. 0 592 58
Each
£419.52
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 25A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 269-676
  • Mfr. Part No. 3VA5285-5ED31-2AA0
Each
£527.81
Schneider Electric EasyPact Electronic Circuit Breaker 500A, Plug In
  • RS Stock No. 122-317
  • Mfr. Part No. LV563325P
Each
£652.37
Eaton RCBO, 6A Current Rating, 3P Poles, 100mA Trip Sensitivity, Type A, Type D, FRBmM Range
  • RS Stock No. 123-297
  • Mfr. Part No. 170749 FRBMM-D6/3/01-A
Each
£160.74
Socomec FUSOMAT Trip Unit for use with SIDERMAT Fuse Disconnecting Switches
  • RS Stock No. 252-3544
  • Mfr. Part No. 39911380
Each
£68.30
Eaton xEffect MCB, 2P, 250mA Curve C
  • RS Stock No. 230-0930
  • Mfr. Part No. 177553 FAZ6-C0,25/2
Each
£72.78
Better World
Siemens 5SV3 RCCB, 25A, 4 Pole, 500mA, Type B, 400V ac
  • RS Stock No. 211-9721
  • Mfr. Part No. 5SV3742-4
Each
£561.09
Results per page
1
2521
2548

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