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

187 of 999+
Temporarily out of stock
SENTRON Trip Unit for use with 3VA6 Series
  • RS Stock No. 263-693
  • Mfr. Part No. 3VA9977-0MA10
Each
HK$5,033.80
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 2A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6537
  • Mfr. Part No. 5SL4602-8
Each
HK$1,754.30
Temporarily out of stock
Hager BSC RCCB, 63A, 4 Pole, 1A, Type AC
  • RS Stock No. 602-081
  • Mfr. Part No. BSC863
Each
HK$4,633.90
In Stock
Eaton xEffect MCB, 2P, 20A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4602
  • Mfr. Part No. 239104 FAZ6-C20/2
Each
HK$430.20
Temporarily out of stock
Hager BFF RCCB, 25A, 2 Pole, 300mA, Type F
  • RS Stock No. 602-058
  • Mfr. Part No. BFF225
Each
HK$4,119.40
Temporarily out of stock
Hager CDS RCD Switch, 25A, 2 Pole, 30mA, Type AC, 230V
  • RS Stock No. 599-840
  • Mfr. Part No. CDS722F
Each
HK$959.30
Temporarily out of stock
ABB S800S MCB, 2P, 20A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 141-240
  • Mfr. Part No. 2CCS862001R0487
Each
HK$4,044.84
Temporarily out of stock
Hager CFC RCD Switch, 40A, 2 Pole, 300mA, Type AC, 230V
  • RS Stock No. 599-852
  • Mfr. Part No. CFC742F
Each
HK$1,556.10
Temporarily out of stock
Hager CDB RCD Switch, 40A, 4 Pole, 30mA, Type B, 230 → 400V
  • RS Stock No. 599-738
  • Mfr. Part No. CDB640F
Each
HK$11,552.90
Temporarily out of stock
Better World
Schneider Electric Busbar Tap-Off Unit, Canalis Series
  • RS Stock No. 211-0397
  • Mfr. Part No. KBC16DCB216
Each (In a Pack of 10)
HK$311.55
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 13A Curve D, 400V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-6604
  • Mfr. Part No. 5SY4613-8
Each
HK$1,559.10
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 2P, 16A Curve B, 400V AC, 72V DC
  • RS Stock No. 209-7446
  • Mfr. Part No. 5SL4216-6
Each
HK$455.00
Temporarily out of stock
Hager CPC RCD Switch, 40A, 4 Pole, 300mA, Type AC, 230 → 400V
  • RS Stock No. 599-857
  • Mfr. Part No. CPC840F
Each
HK$3,529.60
Temporarily out of stock
Hager CPC RCD Switch, 63A, 4 Pole, 300mA, Type AC, 230 → 400V
  • RS Stock No. 599-858
  • Mfr. Part No. CPC863F
Each
HK$4,779.10
In Stock
Legrand 80A Ceramic Cartridge Fuse, 22.2 x 58mm
  • RS Stock No. 266-3173
  • Mfr. Part No. 0 153 80
1 Box of 10
HK$1,079.83
Temporarily out of stock
Hager CFB RCCB, 63A, 3P+N Pole, 300mA, Type B, 230 → 400V ac
  • RS Stock No. 597-884
  • Mfr. Part No. CFB663F
Each
HK$14,459.70
Temporarily out of stock
Eaton xEffect RCCB, 40A, 2 Pole, 100mA, Type F, 240V ac
  • RS Stock No. 246-623
  • Mfr. Part No. 187373 FRCMM-40/2/01-G/F
Each
HK$2,651.70
Temporarily out of stock
Hager BDF Series RCCB, 40A, 2 Pole, 30mA, Type F
  • RS Stock No. 597-897
  • Mfr. Part No. BDF240
Each
HK$4,331.40
Temporarily out of stock
Eaton xE?ect - FRCmM-NA RCCB, 40A, 4 Pole, 300mA, Type A, 240/415V ac
  • RS Stock No. 120-324
  • Mfr. Part No. 167105 FRCMM-40/4/03-A-NA
Each
HK$2,299.40
Temporarily out of stock
Eaton 60A Fuse Holder for 60 x 125 x 35.6mm Fuse, 1P, 690V
  • RS Stock No. 229-027
  • Mfr. Part No. CM60CF
1 Pack of 10
HK$4,110.40
1
187
2364
Results per page

Related links