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

131 of 999+
Temporarily out of stock
Schneider Electric PowerPact H Nut for use with Circuit Breaker
  • RS Stock No. 438-901
  • Mfr. Part No. S37428
1 Pack of 2
HK$1,010.06
Temporarily out of stock
Eaton 4A Tag Fuse, 12 x 47mm, 240V
  • RS Stock No. 229-152
  • Mfr. Part No. SSD4
1 Pack of 20
HK$1,511.30
In Stock
Littelfuse SMD Non Resettable Fuse 750mA, 63V dc
  • RS Stock No. 820-7101P
  • Mfr. Part No. 0438.750WR
Each (Supplied on a Reel)
HK$6.938
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 218-1853
  • Mfr. Part No. 3VA9404-0QE00
Each
HK$1,146.80
In Stock
Littelfuse 20A Inline Fuse Holder for 6.3 x 32mm Fuse, 32V dc
  • RS Stock No. 360-7294
  • Mfr. Part No. 01550100Z
Each (In a Pack of 5)
HK$21.00
Temporarily out of stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 80A Current Rating
  • RS Stock No. 175-1555
  • Mfr. Part No. GV4PE80S6
Each
HK$9,572.79
Temporarily out of stock
Better World
Siemens SENTRON 5SL6 MCB, 2P, 20A Curve C, 400V AC, 72V DC
  • RS Stock No. 213-1040
  • Mfr. Part No. 5SL6220-7
Each
HK$577.20
In Stock
Schneider Electric Acti9 A9F MCB, 4P, 50A Curve B, 440V AC, 250V DC, 30 kA Breaking Capacity
  • RS Stock No. 288-7093
  • Mfr. Part No. A9F93450
Each
HK$8,045.66
In Stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 115A Current Rating
  • RS Stock No. 175-1496
  • Mfr. Part No. GV4P115B
Each
HK$3,883.90
In Stock
Siemens 12A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 395-519
  • Mfr. Part No. 3NC1012
Each (In a Pack of 10)
HK$127.91
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 55 kA
  • RS Stock No. 210-1629
  • Mfr. Part No. 3VA1116-5EE32-0AA0
Each
HK$7,822.70
In Stock
Better World
Schneider Electric, ComPacT NSX MCCB 3P 32A, Fixed Mount
  • RS Stock No. 254-6297
  • Mfr. Part No. C10N3TM032
Each
HK$3,117.10
In Stock
Littelfuse 70A Tan BF1 Car Fuse, 32V dc
  • RS Stock No. 431-6725
  • Mfr. Part No. 153.5631.5701
Each (In a Pack of 5)
HK$25.42
In Stock
Eaton 30A F Cartridge Fuse, 10 x 22mm
  • RS Stock No. 848-4046
  • Mfr. Part No. JJN-30
Each
HK$525.50
In Stock
Wickmann 0.5A Resettable Fuse, 60V dc
  • RS Stock No. 174-0809
  • Mfr. Part No. 60R050XU
Each (In a Pack of 50)
HK$2.942
Temporarily out of stock
Schneider Electric Altivar Process Modular Busbar, 380 → 480V
  • RS Stock No. 578-328
  • Mfr. Part No. VW3A99BR01
Each
HK$4,764.90
In Stock
Schurter 6.3A FF Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 865-0284
  • Mfr. Part No. 0034.0909
Each (In a Pack of 10)
HK$48.19
In Stock
Wickmann 1.1A Resettable Fuse, 30 V ac, 30V dc
  • RS Stock No. 174-0796
  • Mfr. Part No. RF2624-000
Each (In a Pack of 20)
HK$2.94
Temporarily out of stock
SENTRON Wire Connector for use with 3VA52 Series
  • RS Stock No. 263-873
  • Mfr. Part No. 3VA9234-0JF60
1 Kit
HK$1,410.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 20A, Breaking Capacity 70 kA
  • RS Stock No. 209-6780
  • Mfr. Part No. 3VA1120-6EF46-0AA0
Each
HK$4,643.80
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