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

47266 Products showing for Fuses & Circuit Breakers

34 of 999+
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 1kA 1SDA07, 3 channels
  • RS Stock No. 259-9936
  • Mfr. Part No. 1SDA070799R1
Each
HK$79,215.64
In Stock
Schneider Electric, ComPacT NSX MCCB 4P 100A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 254-6287
  • Mfr. Part No. C10F4
Each
HK$3,459.20
Temporarily out of stock
Eaton 3A Bolt Fixing Photovoltaic Fuse, 1000V dc, 49.7mm
  • RS Stock No. 703-8245P
  • Mfr. Part No. PV-3A10-T
Each (Supplied in a Box)
HK$75.73
Temporarily out of stock
Better World
Schneider Electric iID RCCB, 25A, 4 Pole, 30mA
  • RS Stock No. 776-3698
  • Mfr. Part No. A9R31425
Each
HK$3,273.44
Temporarily out of stock
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX630 Circuit Breakers
  • RS Stock No. 260-8194
  • Mfr. Part No. C6346E630
Each
HK$46,477.48
In Stock
Eaton 125A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 181-8876
  • Mfr. Part No. C22M125
Each
HK$35.40
Temporarily out of stock
Siemens Fuse Holder Adapter Sleeve
  • RS Stock No. 202-7160
  • Mfr. Part No. 5SH5404
Each (In a Pack of 10)
HK$14.27
Temporarily out of stock
ABB Motor Operator, For Use With XT2, XT4 Circuit Breaker
  • RS Stock No. 192-0893
  • Mfr. Part No. 1SDA066466R1
Each
HK$6,699.59
In Stock
HENSEL 1, 3 Phase Distribution Board, 24 Way, 63 A
  • RS Stock No. 183-2860
  • Mfr. Part No. KV9224M
Each
HK$1,357.40
Currently unavailable
Schneider Electric EasyPact Electronic Circuit Breaker 63A, Plug In
  • RS Stock No. 122-460
  • Mfr. Part No. LV510335P
Each
HK$1,266.04
In Stock
Better World
Schneider Electric Acti 9 iC60N MCB, 3P, 63A Curve C, 100 → 130V AC, 12 → 144V DC, 6 kA Breaking Capacity
  • RS Stock No. 734-9270
  • Mfr. Part No. A9F77363
Each
HK$2,860.63
In Stock
Wickmann 10A Red Blade Car Fuse, 58V dc
  • RS Stock No. 174-0759
  • Mfr. Part No. 0997010.WXN
Each (In a Pack of 10)
HK$4.86
In Stock
Better World
Schneider Electric Multi 9 C60N MCB, 3P, 20A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 214-2072
  • Mfr. Part No. M9F11320
Each
HK$867.20
Temporarily out of stock
Schneider Electric Acti 9 Acti9 iDT40N XA MCB, 3+N, 40A Curve C, 400V AC
  • RS Stock No. 238-3439
  • Mfr. Part No. A9PA4740
Each
HK$2,025.30
Temporarily out of stock
Better World
Schneider Electric Acti9 iIG40K RCCB, 40A, 3+N Pole, 300mA, Type AC, 380 → 415V ac
  • RS Stock No. 238-3478
  • Mfr. Part No. A9R79740
Each
HK$2,943.20
Temporarily out of stock
Better World
Schneider Electric Busbar Centre Feed Unit, Canalis KS Series
  • RS Stock No. 211-0454
  • Mfr. Part No. KSA250ABT4
Each
HK$9,226.10
In Stock
Siemens 8A Cartridge Fuse
  • RS Stock No. 210-6997
  • Mfr. Part No. 3NW6008-1
Each (In a Pack of 10)
HK$55.76
Temporarily out of stock
Hager NFN MCB, 1P, 500mA Curve C, 230 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 597-901
  • Mfr. Part No. NFN100
Each
HK$536.50
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 400A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 260-8125
  • Mfr. Part No. C40N32D400
Each
HK$31,959.83
In Stock
Better World
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 3P 200A, Fixed Mount
  • RS Stock No. 232-0279
  • Mfr. Part No. 1SDA068220R1 XT3S 250 TMD 200A FF
Each
HK$5,696.20
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