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

198 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3990
  • Mfr. Part No. 3VA2110-7JP42-0AA0
Each
HK$17,017.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4647
  • Mfr. Part No. 3VA2140-7HK46-0AA0
Each
HK$10,490.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 209-5135
  • Mfr. Part No. 3VA2116-6HL46-0AA0
Each
HK$15,168.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4019
  • Mfr. Part No. 3VA2110-8HL36-0AA0
Each
HK$9,990.40
Currently unavailable
Hager NFN MCB, 2P, 20A Curve C, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4714
  • Mfr. Part No. NFN220
Each
HK$892.71
Temporarily out of stock
Sensata Airpax Airpax Thermal Circuit Breaker - AP12 2 Pole Panel Mount, 5A Current Rating
  • RS Stock No. 275-0168
  • Mfr. Part No. AP12-1-61-502
1 Box of 5
HK$22,237.10
Temporarily out of stock
ABB System Pro M Compact S200 M UC MCB, 2P, 40A Curve C, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 202-917
  • Mfr. Part No. 2CDS272061R0404
Each
HK$1,962.90
Temporarily out of stock
Schneider Electric Acti9 Busbar, 415V ac, 19mm Pitch
  • RS Stock No. 653-965
  • Mfr. Part No. A9XPH306
Each
HK$371.57
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 260-396
  • Mfr. Part No. 3VA6225-7HL31-2AA0
Each
HK$15,043.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4638
  • Mfr. Part No. 3VA2140-6JQ42-0AA0
Each
HK$18,805.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4506
  • Mfr. Part No. 3VA2125-0HN42-0AA0
Each
HK$13,774.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 2P 125A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9710
  • Mfr. Part No. 3VA11124ED220AA0
Each
HK$5,804.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 50A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9601
  • Mfr. Part No. 3VA10503ED360AA0
Each
HK$2,979.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 32A, Breaking Capacity 16 kA, Fixed Mount
  • RS Stock No. 271-9582
  • Mfr. Part No. 3VA10322ED460AA0
Each
HK$3,963.00
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4634
  • Mfr. Part No. 3VA2140-6JP42-0AA0
Each
HK$15,338.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9641
  • Mfr. Part No. 3VA11103ED460AA0
Each
HK$5,206.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3712
  • Mfr. Part No. 3VA2025-8JQ32-0AA0
Each
HK$18,800.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4022
  • Mfr. Part No. 3VA2110-8HM32-0AA0
Each
HK$12,767.00
Temporarily out of stock
ABB Tmax XT Cover for use with Tmax XT
  • RS Stock No. 231-9367
  • Mfr. Part No. 1SDA105018R1 LTC XT5
Each
HK$357.00
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 1P, 20A Curve C, 100 → 133V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3307
  • Mfr. Part No. A9F54120
Each
HK$194.80
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