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

47265 Products showing for Fuses & Circuit Breakers

229 of 999+
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 1A, 250V ac
  • RS Stock No. 226-6549
  • Mfr. Part No. 37011000000
Each (In a Pack of 10)
HK$4.96
In Stock
RS PRO Thermal Circuit Breaker -, 10A Current Rating
  • RS Stock No. 774-0027
Each
HK$52.50
Temporarily out of stock
Schneider Electric Tee Elbow Busbar Trunking, 290mm, 1000A, KSA Series
  • RS Stock No. 654-158
  • Mfr. Part No. KSA1000DLC401
Each
HK$25,492.93
Temporarily out of stock
Schneider Electric Acti9 iC60H MCB, 4P, 2A Curve B, 415V AC, 250V DC, 70 kA Breaking Capacity
  • RS Stock No. 654-747
  • Mfr. Part No. A9F53401
Each
HK$2,761.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 50A, Breaking Capacity 55 kA
  • RS Stock No. 210-1667
  • Mfr. Part No. 3VA1150-5EF42-0AA0
Each
HK$4,851.90
Temporarily out of stock
Better World
Siemens Sentron 5SY4 MCB, 3P, 1.6A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 622-0137
  • Mfr. Part No. 5SY4315-7
Each
HK$1,154.50
Temporarily out of stock
Siemens SENTRON Adapter for use with 3VA15
  • RS Stock No. 161-882
  • Mfr. Part No. 3VA9587-0LF10
Each
HK$1,624.40
In Stock
Better World
Schneider Electric 25A 356x167mm Fuse Block, 230 - 690V
  • RS Stock No. 219-8948
  • Mfr. Part No. KSB32CF5
Each
HK$1,547.10
In Stock
Hager NFN MCB, 2P, 50A Curve C, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4718
  • Mfr. Part No. NFN250
Each
HK$1,698.93
Temporarily out of stock
ABB S302 MCB, 2P, 20A Curve B, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-750
  • Mfr. Part No. 2CDS382001R0205
Each
HK$1,798.30
Temporarily out of stock
Siemens SENTRON Cover Frame for use with 3VA10/11
  • RS Stock No. 161-937
  • Mfr. Part No. 3VA9054-0SB20
Each
HK$248.00
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 10 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-498
  • Mfr. Part No. 3VA5110-6ED31-0AA0
Each
HK$3,179.40
In Stock
RS PRO 250mA T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 610-9888
Each (In a Pack of 10)
HK$4.27
In Stock
Better World
Siemens Sentron 5SY4 MCB, 3P, 10A Curve B, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1363
  • Mfr. Part No. 5SY4310-6
Each
HK$1,046.30
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3P, 13A Curve B, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 209-7514
  • Mfr. Part No. 5SY4313-6
Each
HK$1,171.70
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 2P, 32A Curve B, 400V AC, 72V DC
  • RS Stock No. 209-7448
  • Mfr. Part No. 5SL4232-6
Each
HK$642.50
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 500mA Curve D, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8844
  • Mfr. Part No. 5SY4605-8
Each
HK$1,567.60
In Stock
ABB RCBO, 16A Current Rating, 3P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 767-4403
  • Mfr. Part No. 2CSR273001R1164 DS203 M AC-C16/0,03
Each
HK$1,646.10
Temporarily out of stock
100A Cartridge Fuse, 26 x 111mm
  • RS Stock No. 261-939
  • Mfr. Part No. TCP100A
1 Pack of 10
HK$4,088.90
Temporarily out of stock
Eaton MSC-DE Electronic Circuit Breaker 16.7A MSC-DE, DIN Rail
  • RS Stock No. 120-899
  • Mfr. Part No. 167815 MSC-DE-4-M17-SP(24V50/60HZ)
Each
HK$2,673.66
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