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

87 of 999+
In Stock
Siemens SENTRON Busbar
  • RS Stock No. 213-2589
  • Mfr. Part No. 5ST3803
Each
HK$409.20
Temporarily out of stock
Schneider Electric MasterPact Insulation accessory for use with MTZ1
  • RS Stock No. 212-003
  • Mfr. Part No. LV833768SP
Each
HK$886.78
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 100A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 347-088
  • Mfr. Part No. C10N47E100
Each
HK$42,335.21
Temporarily out of stock
ABB System Pro M Compact S200M MCB, 4P, 10A Curve K, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 202-977
  • Mfr. Part No. 2CDS274001R0427
Each
HK$3,939.32
Temporarily out of stock
Schneider Electric Resi9 Resi9 XE MCB, 1P, 16A, 230V AC
  • RS Stock No. 358-445
  • Mfr. Part No. R9ECL616
Each
HK$979.27
Temporarily out of stock
ABB S800S MCB, 1P, 13A Curve D, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-863
  • Mfr. Part No. 2CCS861001R0131
Each
HK$1,609.90
In Stock
NEMIQ Earthing Strap Copper
  • RS Stock No. 283-7538
  • Mfr. Part No. JF 10-150 M6
Each
HK$51.30
In Stock
Schurter 1.6A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 167-7083
  • Mfr. Part No. 70103430
Each (In a Pack of 10)
HK$18.28
Temporarily out of stock
RS PRO PC Board Non Resettable Fuse, Axial 12A, 32V ac/dc
  • RS Stock No. 764-9504
Each (In a Pack of 10)
HK$4.115
In Stock
NEMIQ Earthing Strap Copper
  • RS Stock No. 288-4616
  • Mfr. Part No. JF 25-100 M10
Each
HK$218.80
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 1.25kA 1SDA07, 3 channels
  • RS Stock No. 259-3103
  • Mfr. Part No. 1SDA070956R1
Each
HK$59,307.16
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 800A 1SDA07, 4 channels
  • RS Stock No. 259-3541
  • Mfr. Part No. 1SDA071521R1
Each
HK$59,797.08
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 6 kA, Fixed Mount
  • RS Stock No. 250-702
  • Mfr. Part No. 192366 NZMS3-PX250-BT
Each
HK$35,499.70
In Stock
ABB RCBO, 63A Current Rating, 3P Poles, Type C
  • RS Stock No. 237-5073
  • Mfr. Part No. 2CSR253001R1634
Each
HK$3,320.24
Temporarily out of stock
ABB S804N MCB, 4P, 32A Curve C, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-556
  • Mfr. Part No. 2CCS894001R0324
Each
HK$5,917.25
In Stock
Better World
Schneider Electric Auto Recloser for use with 2
  • RS Stock No. 220-1209
  • Mfr. Part No. A9C70342
Each
HK$6,471.57
Temporarily out of stock
Siemens SENTRON Long Rear Connection for use with 3VA2 100/160/250
  • RS Stock No. 269-7116
  • Mfr. Part No. 3VA9204-0QF00
Each (In a Pack of 4)
HK$181.75
Temporarily out of stock
Siemens SENTRON 5SJ4150 MCB, 1P, 50A Curve C, 400V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 299-850
  • Mfr. Part No. 5SJ4150-7HG41
Each
HK$931.70
Temporarily out of stock
RS PRO PC Board Non Resettable Fuse, Axial 1.25A, 125V ac/dc
  • RS Stock No. 764-9463P
Each (Supplied on a Reel)
HK$2.155
Temporarily out of stock
Better World
Schneider Electric Acti 9 iC60H MCB, 3P, 40A Curve C, 220 → 240V AC, 24V DC, 10 kA Breaking Capacity
  • RS Stock No. 790-7361
  • Mfr. Part No. A9C65340
Each
HK$4,706.54
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