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

169 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3793
  • Mfr. Part No. 3VA2040-8HL36-0AA0
Each
HK$9,175.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3803
  • Mfr. Part No. 3VA2040-8HN36-0AA0
Each
HK$9,980.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3811
  • Mfr. Part No. 3VA2040-8JQ36-0AA0
Each
HK$18,681.50
In Stock
Better World
Siemens, SENTRON MCCB 3P 32A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 209-4965
  • Mfr. Part No. 3VA1132-3EF32-0AA0
Each
HK$3,121.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3627
  • Mfr. Part No. 3VA2010-8KQ42-0AA0
Each
HK$22,884.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 16 kA
  • RS Stock No. 209-6737
  • Mfr. Part No. 3VA1025-2ED32-0AA0
Each
HK$2,566.30
In Stock
Schurter Non-Resettable Fuse Kit
  • RS Stock No. 122-3333
  • Mfr. Part No. 0034.9857
Each
HK$1,107.60
In Stock
Littelfuse 355A Grey, White Fuse Strips Car Fuse, 80V dc
  • RS Stock No. 226-1027
  • Mfr. Part No. 157.5701.6351
Each
HK$65.00
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4056
  • Mfr. Part No. 3VA2116-0HM46-0AA0
Each
HK$24,740.30
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 1kA, Breaking Capacity 30 kA, Fixed Mount
  • RS Stock No. 341-204
  • Mfr. Part No. C100N420FM
Each
HK$99,934.81
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 63A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9609
  • Mfr. Part No. 3VA10633ED360AA0
Each
HK$2,979.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3976
  • Mfr. Part No. 3VA2110-7HL36-0AA0
Each
HK$8,843.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4525
  • Mfr. Part No. 3VA2125-6HK32-0AA0
Each
HK$7,375.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4082
  • Mfr. Part No. 3VA2116-6KQ32-0AA0
Each
HK$23,286.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4667
  • Mfr. Part No. 3VA2140-7JQ46-0AA0
Each
HK$19,772.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4532
  • Mfr. Part No. 3VA2125-6HM42-0AA0
Each
HK$12,863.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 36 kA
  • RS Stock No. 210-1646
  • Mfr. Part No. 3VA1125-4EF46-0AA0
Each
HK$4,851.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4601
  • Mfr. Part No. 3VA2140-0HN36-0AA0
Each
HK$11,136.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3608
  • Mfr. Part No. 3VA2010-8HN36-0AA0
Each
HK$10,756.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4008
  • Mfr. Part No. 3VA2110-7MP32-0AA0
Each
HK$11,502.90
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