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

2287 of 999+
In Stock
Better World
Siemens Sentron 5SY4 MCB, 1P, 1A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 622-0008
  • Mfr. Part No. 5SY4101-7
Each
HK$410.40
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 5 kA, Withdrawable
  • RS Stock No. 230-053
  • Mfr. Part No. 110874 NZMN3-4-AE400-AVE
Each
HK$33,928.95
In Stock
ABB High Performance S800S MCB, 3P, 63A Curve D, 400V AC, 250V DC, 50 kA Breaking Capacity
  • RS Stock No. 435-213
  • Mfr. Part No. 2CCS863001R0631 S803S-D63
Each
HK$2,467.95
In Stock
Eaton xEffect MCB, 3P, 6A Curve D, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 847-3658
  • Mfr. Part No. 278890 FAZ-D6/3
Each
HK$927.50
Temporarily out of stock
Better World
Siemens SENTRON 5SY8 MCB, 3P, 13A Curve D
  • RS Stock No. 236-8436
  • Mfr. Part No. 5SY8313-8
Each
HK$1,558.70
Temporarily out of stock
Lovato ModuLo P1MB MCB, 2P, 10A Curve D, 230V AC, 80V DC, 10 kA Breaking Capacity
  • RS Stock No. 825-5750
  • Mfr. Part No. P1MB2PD10
Each
HK$368.00
In Stock
Eaton xEffect MCB, 3P, 10A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 624-0456
  • Mfr. Part No. 278869 FAZ-C10/3
Each
HK$814.90
In Stock
Eaton MEMShield MCB, 1P, 20A Curve B, 230V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 124-3024
  • Mfr. Part No. EMBH120 EMBH120
Each
HK$288.40
In Stock
ABB System Pro M Compact S200 MCB, 2P, 2A Curve D, 230V AC, 125V DC, 20 kA Breaking Capacity
  • RS Stock No. 191-9448
  • Mfr. Part No. 2CDS252001R0021 S202-D2
Each
HK$608.10
In Stock
Lovato ModuLo P2MB MCB, 4P, 80A Curve C, 230V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 825-6175
  • Mfr. Part No. P2MB4PC080
Each
HK$2,053.40
Temporarily out of stock
Better World
Siemens Sentron 5SY4 MCB, 1+N, 40A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3216
  • Mfr. Part No. 5SY4540-7
Each
HK$694.40
In Stock
Eaton xEffect MCB, 3P, 50A Curve C, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 847-3406
  • Mfr. Part No. 278878 FAZ-C50/3
Each
HK$963.90
Temporarily out of stock
ABB S800PV MCB, 4P, 5A Curve B, 1500V DC, 5 kA Breaking Capacity
  • RS Stock No. 225-5914
  • Mfr. Part No. 2CCF019586R0001 S804PV-SP5 - 5 kA
Each
HK$3,829.84
In Stock
Eaton xEffect MCB, 1+N, 6A Curve B, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7055
  • Mfr. Part No. 278642 FAZ-B6/1N
Each
HK$513.30
In Stock
Better World
Schneider Electric Acti 9 iC60L MCB, 2P, 10A Curve K, 15 kA Breaking Capacity
  • RS Stock No. 219-9299
  • Mfr. Part No. A9F95210
Each
HK$1,754.72
In Stock
Europa EUC2P EUC MCB, 2P, 10A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6547
  • Mfr. Part No. EUC2P10C
Each
HK$268.30
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 1+N, 20A Curve B, 230V AC, 72V DC
  • RS Stock No. 209-7484
  • Mfr. Part No. 5SL4520-6
Each
HK$496.50
Temporarily out of stock
ABB SMISSLINE TP MCB, 4P, 10A Curve D, 400V AC
  • RS Stock No. 246-2665
  • Mfr. Part No. 2CCS573103R8101
Each
HK$1,979.93
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 4A Curve B, 400V AC, 72V DC
  • RS Stock No. 210-3369
  • Mfr. Part No. 5SL4404-6
Each
HK$1,326.20
In Stock
Lovato ModuLo P1MB MCB, 4P, 40A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 825-5970
  • Mfr. Part No. P1MB4PC40
Each
HK$942.50
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