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

75 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 260-447
  • Mfr. Part No. 3VA6340-6HL31-0AA0
Each
HK$21,177.70
Temporarily out of stock
ABB S800U MCB, 2P, 80A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 141-175
  • Mfr. Part No. 2CCS862017R0627
Each
HK$6,800.89
Temporarily out of stock
Hager Hager NRN Circuit Breaker, 4P, 50A Curve C, 415V AC, 15 kA Breaking Capacity
  • RS Stock No. 599-715
  • Mfr. Part No. NRN450
Each
HK$4,453.80
Temporarily out of stock
ABB S800S MCB, 4P, 32A Curve C, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-722
  • Mfr. Part No. 2CCS864001R0324
Each
HK$7,779.02
Temporarily out of stock
Better World
Schneider Electric Acti 9 iC60L MCB, 4P, 63A Curve C, 15 kA Breaking Capacity
  • RS Stock No. 219-9291
  • Mfr. Part No. A9F94463
Each
HK$4,717.00
In Stock
NEMIQ Earthing Strap Copper
  • RS Stock No. 288-4612
  • Mfr. Part No. JF 16-150 M10
Each
HK$229.70
In Stock
NEMIQ Earthing Strap Tinned Copper
  • RS Stock No. 285-8290
  • Mfr. Part No. JF 10-300 M6
Each
HK$61.70
In Stock
NEMIQ Earthing Strap Copper
  • RS Stock No. 288-4613
  • Mfr. Part No. JF 16-200 M10
Each
HK$68.60
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 250-169
  • Mfr. Part No. 3VA6580-7JP32-0AA0
Each
HK$52,818.70
In Stock
NEMIQ Earthing Strap Copper
  • RS Stock No. 288-4615
  • Mfr. Part No. JF 16-250 M10
Each
HK$69.20
Temporarily out of stock
Siemens SENTRON 5SY7 MCB, 1P, 1.6A Curve D, 400V AC, 60V DC, 50 kA Breaking Capacity
  • RS Stock No. 610-524
  • Mfr. Part No. 5SY7115-8
Each
HK$453.65
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-461
  • Mfr. Part No. 3VA6560-7HM46-2AA0
Each
HK$57,255.10
Temporarily out of stock
Legrand DX3 Circuit Breaker, 4P, 63A, Type AC, 400V AC
  • RS Stock No. 266-1364
  • Mfr. Part No. 411669
Each
HK$4,882.60
Temporarily out of stock
Better World
Schneider Electric RCBO, 25A Current Rating, 3P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 238-3325
  • Mfr. Part No. A9DS1725
Each
HK$4,971.15
Temporarily out of stock
Better World
Schneider Electric Busbar Trunking Pendant Bracket, Canalis KS Series
  • RS Stock No. 219-8954
  • Mfr. Part No. KSB400ZFKP1
Each (In a Pack of 4)
HK$715.33
In Stock
Eaton xEffect MCB, 2P, 5A Curve C, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 847-3380
  • Mfr. Part No. 102163 FAZ-C5/2-NA
Each
HK$768.20
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 2P, 12.5A Curve D, 400V AC, 72V DC, 25 kA Breaking Capacity
  • RS Stock No. 610-603
  • Mfr. Part No. 5SY8224-8BB08
Each
HK$759.22
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 257-667
  • Mfr. Part No. 3VA5460-5GC41-0AA0
Each
HK$26,869.70
Temporarily out of stock
ABB S802N MCB, 2P, 25A Curve C, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-595
  • Mfr. Part No. 2CCS892001R0254
Each
HK$3,127.32
In Stock
Schneider Electric Resi9 R9F23 Circuit Breaker, 1P, 16A Curve B, 230V AC, 6000 A Breaking Capacity
  • RS Stock No. 655-494
  • Mfr. Part No. R9F23116
Each
HK$98.09
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