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

46 / 999+
In Stock
RS PRO Earthing Strap Metal 12 → 32mm Diameter
  • RS Stock No. 390-2448
Each (In a Pack of 10)
MYR11.328
In Stock
Siemens Sentron Trip alarm switch for use with 3VA Series Circuit Breaker
  • RS Stock No. 874-4515
  • Mfr. Part No. 3VA9988-0AB12
Each
MYR183.56
In Stock
Schurter 4A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 167-7134
  • Mfr. Part No. 70103470
Each (In a Pack of 10)
MYR9.72
In Stock
Better World
Schneider Electric, ComPact MCCB, Fixed Mount
  • RS Stock No. 221-0938
  • Mfr. Part No. LV429388
Each
MYR716.17
In Stock
Siemens 8WH6 Busbar, 10mm Pitch
  • RS Stock No. 267-5900
  • Mfr. Part No. 8WH9030-2AB12
Each (In a Pack of 10)
MYR195.959
In Stock
Littelfuse 100 Spring Brass PCB Mount Fuse Clip for 5 x 20mm Cartridge Fuse
  • RS Stock No. 894-9562
  • Mfr. Part No. 01000056Z
Each (In a Pack of 10)
MYR1.178
In Stock
Schneider Electric Acti 9 Safety Transformer for use with Acti9
  • RS Stock No. 247-1921
  • Mfr. Part No. A9A15222
Each
MYR688.71
Temporarily out of stock
Schneider Electric Surge Arrester, 75kA, 1200V (Volts), Plug In Mount
  • RS Stock No. 357-350
  • Mfr. Part No. M9L12240
Each
MYR3,447.67
In Stock
Siemens 4A NH Fuse, NH000, 500V ac
  • RS Stock No. 395-989
  • Mfr. Part No. 3NA3804
Each (In a Pack of 3)
MYR39.723
In Stock
ABB MISTRAL65 Wall Fixing Brackets
  • RS Stock No. 232-0308
  • Mfr. Part No. 1SL1927A00 MISTRAL
Each
MYR67.76
Limited stock
Limitor Thermal Fuse +80°C 2.5 A, 250V ac
  • RS Stock No. 176-9148
  • Mfr. Part No. P82 80 05100
Each
MYR29.75
In Stock
Eaton PXF-A RCCB, 25A, 1+N Pole, 30mA, Type A, 440V ac
  • RS Stock No. 490-157
  • Mfr. Part No. 236744 PXF-25/2/003-A
Each
MYR343.32
Being discontinued
RS PRO 3A F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 668-6048
Each (In a Pack of 10)
MYR1.826
In Stock
Mersen 20A T Fibreglass Cartridge Fuse, 10 x 38mm
  • RS Stock No. 914-4376
  • Mfr. Part No. ATQR20
Each
MYR109.36
In Stock
Mersen 5A FF Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 188-6782
  • Mfr. Part No. S084311
Each (In a Pack of 10)
MYR20.513
In Stock
RS PRO 3A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 668-5963
Each (In a Pack of 10)
MYR2.251
In Stock
Bourns 0.5A Resettable Fuse, 60V
  • RS Stock No. 647-8027
  • Mfr. Part No. MF-SM050-2
Each (In a Pack of 10)
MYR1.792
Temporarily out of stock
Better World
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 232-0270
  • Mfr. Part No. 1SDA068092R1 XT4N 250 TMA 250A FF
Each
MYR3,864.70
In Stock
Schneider Electric A9Q RCCB, 40A, 2 Pole, 30mA, Type A-SI, 240V ac
  • RS Stock No. 276-8736
  • Mfr. Part No. A9Q31240
Each
MYR1,715.36
Being discontinued
RS PRO 1A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 563-380
Each (In a Pack of 10)
MYR2.287
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