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

50973 Products showing for Fuses & Circuit Breakers

665 of 999+
ETA Thermal Circuit Breaker - 1410-G1 Single Pole 250V Voltage Rating Panel Mount, 6.3A Current Rating
  • RS Stock No. 729-2714
  • Mfr. Part No. 1410-G111-P2F1-S01-6.3A
Each
£10.82
ETA 1140-G Circuit Breaker - 1140 Single Pole 240V ac Voltage Rating Panel Mount, 10A Current Rating
  • RS Stock No. 285-7869
  • Mfr. Part No. 1140-G111-P1M1-10A
Each
£17.85
Better World
Schneider Electric NSX100...250 DC Cover for use with Compact NSX
  • RS Stock No. 211-2655
  • Mfr. Part No. LV429526
Each
£12.91
Schneider Electric, PowerPact MCCB 3P 100A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 345-141
  • Mfr. Part No. NHJF36100U31XTW
Each
£2,076.75
Schneider Electric Acti9 1 Phase Distribution Board, 28 Way, 125 A
  • RS Stock No. 339-808
  • Mfr. Part No. SEA14S14
Each
£1,631.66
Schurter 10A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 1P, 250V ac
  • RS Stock No. 866-3422
  • Mfr. Part No. 0031.1653
Each (In a Pack of 100)
£1.456
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 231-164
  • Mfr. Part No. 113539 NZMN3-4-AE400/250-T-AVE
Each
£3,508.50
ABB F200 RCCB, 100A, 4 Pole, 100mA, Type A, 277 V ac, 480 V ac
  • RS Stock No. 177-5089
  • Mfr. Part No. 2CSF204201R2900 F204 A S-100/0,1
Each
£345.22
Wickmann 4A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 174-0630
  • Mfr. Part No. 0313004.MXP
Each (In a Pack of 10)
£1.155
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 630A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 253-616
  • Mfr. Part No. 265960 NZMN3-4-VE630
Each
£3,403.91
Schneider Electric, PowerPact MCCB 3P 30A, Breaking Capacity 18 kA, DIN Rail Mount
  • RS Stock No. 341-432
  • Mfr. Part No. NHGL36030
Each
£1,148.07
Better World
Siemens SENTRON Electronic Circuit Breaker 250A 3VA2, 3 channels
  • RS Stock No. 157-328
  • Mfr. Part No. 3VA2225-7KQ32-0AA0
Each
£1,808.01
Schneider Electric EasyPact Electronic Circuit Breaker 100A, Plug In
  • RS Stock No. 122-347
  • Mfr. Part No. LV510317P
Each
£120.36
Better World
Schneider Electric Acti 9 iC60H MCB, 4P, 63A Curve D, 12 → 133V AC, 220 → 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 790-8743
  • Mfr. Part No. A9F55463
Each
£240.54
Eaton Switch Disconnector for use with Circuit Breaker
  • RS Stock No. 229-005
  • Mfr. Part No. CCP2-1-30CC
1 Pack of 6
£226.97
ABB System Pro M Compact SU200M MCB, 2P, 10A Curve K, 440V AC, 440V DC, 15 kA Breaking Capacity
  • RS Stock No. 231-9741
  • Mfr. Part No. 2CDS272337R0427 SU202M-K10
1 Box of 1
£98.11
Eaton RCBO, 16A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type A, Type B, FRBmM Range
  • RS Stock No. 123-680
  • Mfr. Part No. 170846 FRBMM-B16/2/03-A
Each
£106.02
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 12.5A Current Rating
  • RS Stock No. 175-1469
  • Mfr. Part No. GV4LE12N6
Each
£421.46
Lovato ModuLo P1MB MCB, 1+N, 40A Curve C, 230V AC, 60V DC, 6 kA Breaking Capacity
  • RS Stock No. 825-5539
  • Mfr. Part No. P1MB1NC40
Each
£44.85
Better World
Schneider Electric Acti 9 C60H-DC MCB, 2P, 1A Curve C, 500V DC
  • RS Stock No. 772-1511
  • Mfr. Part No. A9N61521
Each
£125.30
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Guides & Articles

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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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