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

199 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9324
  • Mfr. Part No. 3VA1140-4GD42-0AA0
Each
HK$3,930.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 80A, Breaking Capacity 36 kA
  • RS Stock No. 210-1676
  • Mfr. Part No. 3VA1180-4ED32-0AA0
Each
HK$3,224.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 16A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9446
  • Mfr. Part No. 3VA1196-3ED46-0AA0
Each
HK$4,031.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4027
  • Mfr. Part No. 3VA2110-8HN36-0AA0
Each
HK$10,807.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 2.5 kA, Fixed Mount
  • RS Stock No. 270-4720
  • Mfr. Part No. 3VA2163-6JP32-0AA0
Each
HK$13,550.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4511
  • Mfr. Part No. 3VA2125-0KP46-0AA0
Each
HK$22,522.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 125A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 271-9729
  • Mfr. Part No. 3VA1112-5FD46-0AA0
Each
HK$9,288.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3720
  • Mfr. Part No. 3VA2025-8KP46-0AA0
Each
HK$21,264.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 20A, Breaking Capacity 55 kA, DIN Rail Mount
  • RS Stock No. 271-9832
  • Mfr. Part No. 3VA1120-5GE42-0AA0
Each
HK$4,418.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 125A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9723
  • Mfr. Part No. 3VA1112-4GE46-0AA0
Each
HK$9,064.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 110A, Breaking Capacity 65 kA
  • RS Stock No. 209-6950
  • Mfr. Part No. 3VA5111-6ED31-0AA0
Each
HK$9,803.80
Temporarily out of stock
Better World
Siemens, 0AA0 MCCB 4P 50A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 211-6019
  • Mfr. Part No. 3VA1150-4ED42-0AA0
Each
HK$3,806.40
Temporarily out of stock
Hager Hager HMD Circuit Breaker, 2P, 125A Curve D, 415V AC, 15 kA Breaking Capacity
  • RS Stock No. 599-779
  • Mfr. Part No. HMD299
Each
HK$6,112.90
Temporarily out of stock
Hager Hager MMN Circuit Breaker, 4P, 25A, Type AC, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 599-892
  • Mfr. Part No. MMN425
Each
HK$5,446.10
In Stock
Mersen 10A NH Fuse, NH000, 500V ac
  • RS Stock No. 375-9519
  • Mfr. Part No. B219651
Each (In a Pack of 3)
HK$80.96
Temporarily out of stock
Siemens SENTRON 5SJ4306 MCB, 3P, 6A Curve D, 400V AC, 60V DC, 14 kA Breaking Capacity
  • RS Stock No. 299-778
  • Mfr. Part No. 5SJ4306-8HG41
Each
HK$2,540.00
Temporarily out of stock
125A NH Fuse, 58 x 30 x 135mm, 400V ac
  • RS Stock No. 247-289
  • Mfr. Part No. 125NHG01B-400 NH FUSE 125A 400V GG/GL SIZE 01
1 Pack of 3
HK$309.00
Temporarily out of stock
Eaton 500A Cartridge Fuse, 3.5 x 1.5in
  • RS Stock No. 228-646
  • Mfr. Part No. TPL-CV
Each
HK$2,128.30
Temporarily out of stock
Siemens SENTRON 5SJ4 MCB, 1P, 6A Curve B, 400V AC, 60V DC, 14 kA Breaking Capacity
  • RS Stock No. 212-8927
  • Mfr. Part No. 5SJ4106-6HG40
Each
HK$433.40
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 500mA Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6540
  • Mfr. Part No. 5SL4605-8
Each
HK$1,746.80
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