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

2324 of 999+
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 3 channels
  • RS Stock No. 155-913
  • Mfr. Part No. 3VA2440-5KQ32-0AA0
Each
HK$33,225.70
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 250A Ekip G Hi-Touch LSIG, 3 channels
  • RS Stock No. 259-9870
  • Mfr. Part No. 1SDA070700R1
Each
HK$90,147.36
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 2.5kA Ekip Touch LSIG, 3 channels
  • RS Stock No. 259-4322
  • Mfr. Part No. 1SDA072476R1
Each
HK$152,433.53
Temporarily out of stock
Schneider Electric, PowerPact MCCB 3P 10A, Breaking Capacity 18 kA, DIN Rail Mount
  • RS Stock No. 428-687
  • Mfr. Part No. NHGL36040
Each
HK$12,813.95
Temporarily out of stock
Eaton xEnergy Light Wall Box
  • RS Stock No. 231-026
  • Mfr. Part No. 114735 XLSPP163
Each
HK$438.06
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 6 kA, Plug In
  • RS Stock No. 243-016
  • Mfr. Part No. 191542 NZMS3-4-VX400/VAR-SVE
Each
HK$36,477.50
In Stock
Mersen 16A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 188-7426
  • Mfr. Part No. S201818
Each (In a Pack of 10)
HK$37.95
Currently unavailable
Fuse/5x25mm 0.2A Medium Slow-Blow 241
  • RS Stock No. 565-368
  • Mfr. Part No. 24102000021
Each
HK$15,014.89
In Stock
Better World
Schneider Electric RCBO, 40A Current Rating, 3P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 238-3343
  • Mfr. Part No. A9DV3740
Each
HK$6,138.53
Temporarily out of stock
Better World
Siemens SENTRON 5SY5 MCB, 1P, 20A Curve B, 400V AC, 220V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-7522
  • Mfr. Part No. 5SY5120-6
Each
HK$436.70
Temporarily out of stock
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 3P, 1A Curve C, 277V AC
  • RS Stock No. 256-6802
  • Mfr. Part No. M9F52301
Each
HK$4,107.20
Temporarily out of stock
Eaton 20A Rail Mount Fuse Holder, 1P, 690V ac
  • RS Stock No. 182-1451
  • Mfr. Part No. RS20HGY
Each (In a Box of 10)
HK$899.01
In Stock
Eaton 63A DIII Bottle Fuse, gR, 500V
  • RS Stock No. 228-893
  • Mfr. Part No. 63D33R FUSE-D2 63A F GR 500VAC E33
1 Pack of 5
HK$674.50
In Stock
Schurter 6.3A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 167-8121
  • Mfr. Part No. 0034.3125
Each (In a Pack of 10)
HK$3.22
In Stock
ABB F200 RCCB, 40A, 4 Pole, 30mA, Type A, 230/400V ac
  • RS Stock No. 177-5057
  • Mfr. Part No. 2CSF204401R1400 F204 A-40/0,03 AP-R
Each
HK$1,428.90
Temporarily out of stock
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 18.5 kA, Plug In
  • RS Stock No. 230-868
  • Mfr. Part No. 113195 NZMB2-A250-SVE
Each
HK$13,039.58
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.25kA 1SDA07, 4 channels
  • RS Stock No. 259-3619
  • Mfr. Part No. 1SDA071595R1
Each
HK$73,521.09
In Stock
Contactum 2 Way Steel Consumer Unit, 63A Defender
  • RS Stock No. 184-9102
  • Mfr. Part No. DD026MS
Each
HK$673.00
In Stock
Mersen 4A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 270-3047
  • Mfr. Part No. H095572
Each (In a Box of 10)
HK$7.492
Temporarily out of stock
Siemens 1.6A F Cartridge Fuse, 5 x 25mm
  • RS Stock No. 271-3208
  • Mfr. Part No. 8WA1822-7EF18
Each (In a Pack of 10)
HK$21.14
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