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
Fuses - PCB
Fuses - PCB

46580 Products showing for Fuses & Circuit Breakers

82 / 999+
Better World
Schneider Electric, Compact MCCB 4P 63A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 178-8230
  • Mfr. Part No. LV426375
Each
MYR2,489.96
Siemens SENTRON 5SJ MCB, 1P, 15A
  • RS Stock No. 232-2235
  • Mfr. Part No. 5SJ4118-7HG42
Each
MYR322.66
Better World
Schneider Electric Acti 9 iC60H MCB, 2P, 10A Curve C, 440V AC, 133V DC, 10 kA Breaking Capacity
  • RS Stock No. 776-2317
  • Mfr. Part No. A9F07210
Each
MYR376.28
Littelfuse 4A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-3748
  • Mfr. Part No. 0217004.MXP
Each (In a Pack of 10)
MYR1.437
Better World
Schneider Electric Multi 9 C60SP MCB, 1P, 500mA Curve C, 415V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 211-2365
  • Mfr. Part No. M9F22170
Each
MYR332.71
Siemens 63A Centred Tag Fuse, NH000, 500V ac
  • RS Stock No. 203-2039
  • Mfr. Part No. 3NA7822
Each (In a Pack of 3)
MYR41.027
Littelfuse 300A Grey, White CF Car Fuse, 58V dc
  • RS Stock No. 337-7993
  • Mfr. Part No. 155.0892.6301
Each
MYR57.12
Schneider Electric Shunt Trip Shunt trip for use with ComPact NS630b → 1600, ComPact NS1600b → 3200
  • RS Stock No. 247-1856
  • Mfr. Part No. 33662
Each
MYR1,762.75
Better World
Schneider Electric Acti 9 iC60H MCB, 1P, 4A Curve C, 100 → 133V AC, 72V DC, 70 kA Breaking Capacity
  • RS Stock No. 791-3281
  • Mfr. Part No. A9F54104
Each
MYR229.80
Phoenix Contact Surge Protector, DIN Rail Mount
  • RS Stock No. 131-431
  • Mfr. Part No. 2801512
Each
MYR1,141.46
WJ Furse Copper Earth Bar L. 550mm x W. 90mm x H. 96mm 6 Ways
  • RS Stock No. 124-2504
  • Mfr. Part No. 7TCA083670R0632 LK207-6
Each
MYR1,362.41
Better World
Schneider Electric, ComPacT New Generation Circuit breaker 3P 80A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 254-6280
  • Mfr. Part No. C10B3TM080
Each
MYR3,136.96
Better World
Schneider Electric Acti 9 iC60L MCB, 3P, 16A Curve C, 15 kA Breaking Capacity
  • RS Stock No. 219-9284
  • Mfr. Part No. A9F94316
Each
MYR1,092.31
Better World
Schneider Electric Multi 9 MCB, 2P, 13A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 219-9127
  • Mfr. Part No. M9F22213
Each
MYR536.71
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 2P, 45A Curve C, 240V AC
  • RS Stock No. 256-6761
  • Mfr. Part No. M9F22245
Each
MYR722.51
Limitor Thermal Fuse +100°C 2.5 A, 250V ac
  • RS Stock No. 204-7449
  • Mfr. Part No. Q82 A 100 05 100
Each
MYR31.21
Better World
Schneider Electric Acti 9 MCB, 1P, 6A Curve C, 230V AC, 7.5 kA Breaking Capacity
  • RS Stock No. 200-6144
  • Mfr. Part No. A9PA4606
Each
MYR765.55
Weidmüller Surge Arrester
  • RS Stock No. 288-1812
  • Mfr. Part No. 2530610000
Each
MYR1,014.81
WJ Furse Copper Earth Bar L. 900mm x W. 90mm x H. 96mm 12 Ways
  • RS Stock No. 124-2507
  • Mfr. Part No. 7TCA083670R0605 LK207-12
Each
MYR2,203.00
Legrand 40A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 180-6123
  • Mfr. Part No. 0 143 40
Each (In a Box of 10)
MYR26.355
1
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