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

718 of 999+
Better World
ABB, XT2L MCCB 3P 160A, Fixed Mount
  • RS Stock No. 236-7567
  • Mfr. Part No. 1SDA067923R1 XT2L 160 Ekip I 160A FF
Each
£667.91
Better World
Siemens RCBO, 10A Current Rating, 2P Poles, Type AC, Sentron Range
  • RS Stock No. 196-3614
  • Mfr. Part No. 5SU13541KK10
Each
£235.55
Better World
Siemens SENTRON 5SL6 MCB, 1+N, 25A Curve C, 230V AC, 72V DC
  • RS Stock No. 213-1056
  • Mfr. Part No. 5SL6525-7
Each
£44.18
Siemens SENTRON Busbar, 690V
  • RS Stock No. 266-514
  • Mfr. Part No. 8US1922-1AB00
Each
£11.23
Eaton 500mA T Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 851-1693
  • Mfr. Part No. FNQ-R-1/2
Each
£51.52
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-704
  • Mfr. Part No. 3VA6210-6HN41-0AA0
Each
£1,606.35
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-413
  • Mfr. Part No. 3VA6210-5HL31-0AA0
Each
£1,030.49
Better World
Siemens SENTRON 5SY8 MCB, 2P, 6A Curve C, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 209-6718
  • Mfr. Part No. 5SY8206-7
Each
£97.35
Siemens SENTRON 5SJ4130 MCB, 1P, 30A Curve C, 400V AC, 60V DC, 14 kA Breaking Capacity
  • RS Stock No. 299-737
  • Mfr. Part No. 5SJ4130-7HG41
Each
£58.53
Siemens 3 Phase Surge Protector, 75kA, DIN Rail Mount
  • RS Stock No. 211-0180
  • Mfr. Part No. 5SD7413-1
Each
£831.27
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 250A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 260-428
  • Mfr. Part No. 3VA6325-7JT41-0AA0
Each
£2,720.19
Siemens SIRIUS 3 Phase Busbar, 690V, 63mm Pitch
  • RS Stock No. 246-5178
  • Mfr. Part No. 3RV1915-3AB
Each
£11.36
Siemens SENTRON Busbar
  • RS Stock No. 266-513
  • Mfr. Part No. 8US1210-4AF00
Each
£175.97
Siemens SENTRON Busbar
  • RS Stock No. 266-505
  • Mfr. Part No. 8US1313-4AM04
Each
£287.92
Eaton 2.5A T Nickel Plated Spring Brass (Terminal) Cartridge Fuse, 0.41 x 0.41in
  • RS Stock No. 229-124
  • Mfr. Part No. FNQ-2-1/2
1 Pack of 10
£391.40
Better World
Schneider Electric TeSys GV4L MCB, 3P, 2A, 690V AC, 50 kA Breaking Capacity
  • RS Stock No. 175-1424
  • Mfr. Part No. GV4L02N
Each
£473.10
Better World
Siemens RCBO, 20A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 151-1217
  • Mfr. Part No. 5SU1356-7KK20
Each
£123.56
Eaton 16A gG/gL Cartridge Fuse, 14 x 51mm
  • RS Stock No. 229-272
  • Mfr. Part No. C14G16
1 Pack of 10
£13.72
Siemens 160A Centred Tag Fuse, NH00, 500V ac
  • RS Stock No. 203-1992
  • Mfr. Part No. 3NA7836
Each (In a Pack of 3)
£6.093
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 1kA, Breaking Capacity 15 kA, Fixed Mount
  • RS Stock No. 259-051
  • Mfr. Part No. 271121 NZMN4-AE1000-NA
Each
£5,545.07
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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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