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

2227 of 999+
Temporarily out of stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 500mA Curve D
  • RS Stock No. 237-3311
  • Mfr. Part No. 2CDS253103R0981
Each
HK$2,194.01
In Stock
Siemens SENTRON 5SJ MCB, 2P, 10A
  • RS Stock No. 232-2252
  • Mfr. Part No. 5SJ4210-8HG41
Each
HK$1,209.90
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.25kA Ekip Dip LI, 4 channels
  • RS Stock No. 259-3494
  • Mfr. Part No. 1SDA071461R1
Each
HK$56,678.53
Temporarily out of stock
ABB RCBO, 50A Current Rating, 1P Poles, Type B
  • RS Stock No. 237-5231
  • Mfr. Part No. 2CSR275051R0505
Each
HK$1,569.29
In Stock
Legrand, DX3 MCCB 1P 25A, Breaking Capacity 4.5 kA, DIN Rail Mount
  • RS Stock No. 731-9544
  • Mfr. Part No. 4 067 76
Each
HK$349.01
Temporarily out of stock
400A Tag Fuse, 72 x 150mm, 690V
  • RS Stock No. 262-393
  • Mfr. Part No. 400NHM3B-690
1 Pack of 3
HK$1,233.10
Temporarily out of stock
ABB Cable for use with Miniature Circuit Breakers
  • RS Stock No. 250-4729
  • Mfr. Part No. 2CDL200301R1006
Each
HK$94.95
Temporarily out of stock
ABB SMISSLINE TP MCB, 2P, 40A Curve C, 415V AC
  • RS Stock No. 246-2583
  • Mfr. Part No. 2CCS572001R0404
Each
HK$1,118.31
Temporarily out of stock
ABB 63A Tag Fuse, 79 x 21 x 53mm, 500V
  • RS Stock No. 250-4394
  • Mfr. Part No. 1SCA022697R2770
1 Box of 3
HK$391.51
In Stock
Mersen 125A German Standard Fuse, NH000, 690V ac, 77.5mm
  • RS Stock No. 304-2811
  • Mfr. Part No. R330111
Each
HK$430.50
Temporarily out of stock
ABB SU200 M MCB, 3P, 5A Curve C, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 203-901
  • Mfr. Part No. 2CDS273337R0054
Each
HK$2,804.49
Temporarily out of stock
ABB S303 MCB, 3P, 25A Curve B, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 204-486
  • Mfr. Part No. 2CDS383001R0255
Each
HK$2,978.13
In Stock
Mersen 40A NH Fuse, NH000, 690V ac
  • RS Stock No. 448-3285
  • Mfr. Part No. C320047
Each
HK$352.60
Temporarily out of stock
WEG EC-R2 Busbar for use with CWB40, CWB50, CWB66, CWB80
  • RS Stock No. 201-3476
  • Mfr. Part No. EC-R2
Each
HK$318.07
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-462
  • Mfr. Part No. 3VA6140-8KM41-2AA0
Each
HK$25,865.20
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 1P, 3A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6448
  • Mfr. Part No. 5SL4103-8
Each
HK$337.40
Temporarily out of stock
ABB SU200 M MCB, 1P, 13A, Type Z, 277V AC, 48V DC, 15 kA Breaking Capacity
  • RS Stock No. 201-156
  • Mfr. Part No. 2CDS271337R0448
Each
HK$857.28
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 9 kA, Withdrawable
  • RS Stock No. 232-050
  • Mfr. Part No. 110853 NZMH3-VE400-AVE
Each
HK$33,036.09
In Stock
Better World
Schneider Electric Acti 9 A9N1 MCB, 2P, 125A Curve C, 440V AC, 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 219-8297
  • Mfr. Part No. A9N18459
Each
HK$3,136.60
Temporarily out of stock
Schneider Electric, PowerPact MCCB 1P 100A, Breaking Capacity 65 kA, Clip-On
  • RS Stock No. 346-803
  • Mfr. Part No. BJF16100
Each
HK$7,050.58
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