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

102 of 999+
Schneider Electric RCBO, 20A Current Rating, 3P Poles, 30mA Trip Sensitivity, Type A, Acti9 Range
  • RS Stock No. 212-167
  • Mfr. Part No. A9D17320
Each
HK$3,510.96
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 3 channels Type N
  • RS Stock No. 156-832
  • Mfr. Part No. 3VA2340-0HL32-0AA0
Each
HK$25,946.90
RS PRO F, T Fuse Kit
  • RS Stock No. 611-9138
Each
HK$1,143.60
Eaton 4A T Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 848-3885
  • Mfr. Part No. FNM-4
Each
HK$219.50
Lovato 32A Rail Mount Fuse Holder, 1P, 1kV
  • RS Stock No. 216-8277
  • Mfr. Part No. FB01D1PL
Each
HK$133.75
Lovato 32A Rail Mount Fuse Holder, 1P+N, 690V ac
  • RS Stock No. 216-8280
  • Mfr. Part No. FB01F1M
Each
HK$94.60
Lovato 3 Phase Surge Protector, 50kA
  • RS Stock No. 216-8305
  • Mfr. Part No. SG23PA300R
Each
HK$2,654.82
Better World
Schneider Electric Vigi iTG40 RCD, 40A, 3 Pole, 30mA
  • RS Stock No. 191-6137
  • Mfr. Part No. A9Y12740
Each
HK$3,309.15
Mersen 35A DIII Diazed Fuse, E33 Thread Size, gG, 500V
  • RS Stock No. 377-0500
  • Mfr. Part No. C214063
Each (In a Pack of 5)
HK$15.58
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 300A, Breaking Capacity 18.5 kA, Fixed Mount
  • RS Stock No. 231-534
  • Mfr. Part No. 107582 NZMB2-4-A300
Each
HK$18,099.16
Lovato 1 Phase Surge Protector, 50kA
  • RS Stock No. 216-8297
  • Mfr. Part No. SG21NA300R
Each
HK$1,892.80
Siemens SIRIUS Rotary Operator for use with Circuit Breaker
  • RS Stock No. 271-0877
  • Mfr. Part No. 3RV2926-1K
Each
HK$520.90
Better World
ABB System Pro M Compact S200 MCB, 3P, 4A Curve C, 400V AC, 110V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-7753
  • Mfr. Part No. 2CDS253001R0044 S203-C4
Each
HK$734.64
Schneider Electric MASTERPACT NW MCB, 3P, 3.2kA
  • RS Stock No. 247-1898
  • Mfr. Part No. 48312
Each
HK$289,865.43
nVent ERICO Neutral Busbar Busbar
  • RS Stock No. 646-807
  • Mfr. Part No. 568680
Each
HK$157.41
ETA Thermal Circuit Breaker - 1658 Single Pole 250V Voltage Rating Panel Mount, 10A Current Rating
  • RS Stock No. 273-0860
  • Mfr. Part No. 1658-G21-02-P10-10A
Each
HK$55.60
Better World
Schneider Electric Busbar Trunking Fixing Bracket, Canalis KS Series
  • RS Stock No. 219-8927
  • Mfr. Part No. KSA80EZ5
Each (In a Pack of 10)
HK$453.952
Hager Hager NRN Circuit Breaker, 3P, 10A Curve C, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 599-706
  • Mfr. Part No. NRN310
Each
HK$2,186.80
Better World
Schneider Electric Acti 9 A9F9 MCB, 1P, 32A, Type Z, 230V AC, 72V DC, 20 kA, 15 kA Breaking Capacity
  • RS Stock No. 211-2488
  • Mfr. Part No. A9F92132
Each
HK$464.96
Schneider Electric, ComPacT MCCB 3P 2.5A, Fixed Mount
  • RS Stock No. 260-9423
  • Mfr. Part No. C10F3MA003
Each
HK$5,117.66
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