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

38 of 999+
Temporarily out of stock
Siemens 3RV1935 Busbar for use with Circuit-Breakers 3RV2
  • RS Stock No. 272-0030
  • Mfr. Part No. 3RV19353A
Each
HK$190.30
Temporarily out of stock
Siemens SENTRON 3VA9 Cover for use with 3VA1 100/160
  • RS Stock No. 218-1781
  • Mfr. Part No. 3VA9111-0WG40
Each
HK$341.60
In Stock
Better World
Schneider Electric, ComPacT NSX MCCB 3P 125A, Fixed Mount
  • RS Stock No. 254-6344
  • Mfr. Part No. C16F3TM125
Each
HK$7,267.40
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA1
  • RS Stock No. 269-7192
  • Mfr. Part No. 3VA9404-0QG00
Each (In a Pack of 4)
HK$187.825
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 218-1852
  • Mfr. Part No. 3VA9404-0QA00
Each
HK$521.30
Temporarily out of stock
Siemens SENTRON Cable for use with COM060, COM800
  • RS Stock No. 210-9420
  • Mfr. Part No. 3VA9987-0TC20
Each
HK$216.00
Temporarily out of stock
Better World
Siemens SENTRON for use with 3VA1 and 3VA20 up → 3VA25
  • RS Stock No. 210-9429
  • Mfr. Part No. 3VA9988-0BL32
Each
HK$703.90
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA9603-0KP00
  • RS Stock No. 269-7222
  • Mfr. Part No. 3VA9603-0JJ44
Each (In a Pack of 3)
HK$847.467
Temporarily out of stock
Siemens SENTRON 3VA9 Rotary Handle for use with 3VA1 250
  • RS Stock No. 218-1834
  • Mfr. Part No. 3VA9257-0EK21
Each
HK$794.90
In Stock
Better World
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 100/160
  • RS Stock No. 218-1782
  • Mfr. Part No. 3VA9113-0JB11
Each
HK$180.20
In Stock
Siemens 3ZY1122 Removable Terminal for use with SIRIUS devices
  • RS Stock No. 203-3947
  • Mfr. Part No. 3ZY1122-1BA00
Each (In a Pack of 6)
HK$141.25
Temporarily out of stock
Siemens SENTRON Terminal for use with 3VA2 100/160/250
  • RS Stock No. 226-2826
  • Mfr. Part No. 3VA9201-0QF10
Each
HK$149.20
Temporarily out of stock
ABB RCBO, 32A Current Rating, 2P Poles, 30mA Trip Sensitivity
  • RS Stock No. 231-9965
  • Mfr. Part No. 2CSR275189R1324 DS201 M C32 A30 110V
1 Box of 1
HK$1,636.28
In Stock
RS PRO 100mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 610-9579
Each (In a Pack of 10)
HK$8.467
In Stock
Siemens SENTRON Auxiliary Switch Kit for use with 3VA1 and 3VA20 up → 3VA25
  • RS Stock No. 210-9426
  • Mfr. Part No. 3VA9988-0AA13
Each
HK$280.80
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 250
  • RS Stock No. 210-9342
  • Mfr. Part No. 3VA9253-0JF60
Each
HK$855.60
Temporarily out of stock
Siemens SENTRON Phase Barrier for use with 3VA4/5 125
  • RS Stock No. 269-7077
  • Mfr. Part No. 3VA9132-0WA00
Each (In a Pack of 2)
HK$49.25
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
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 218-1851
  • Mfr. Part No. 3VA9383-0JF60
Each
HK$849.50
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA15/25 1000
  • RS Stock No. 269-7211
  • Mfr. Part No. 3VA9503-0JG23
Each (In a Pack of 3)
HK$489.467
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