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

197 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 160A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 271-9774
  • Mfr. Part No. 3VA1116-4FF42-0AA0
Each
HK$10,147.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4541
  • Mfr. Part No. 3VA2125-6JQ46-0AA0
Each
HK$19,780.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-3956
  • Mfr. Part No. 3VA2110-6HM46-0AA0
Each
HK$13,664.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4050
  • Mfr. Part No. 3VA2116-0HL36-0AA0
Each
HK$15,635.10
In Stock
Schneider Electric Multi9 Multi9 MCB, 4P, 2A Curve B, 240V AC, 10 kA Breaking Capacity
  • RS Stock No. 130-711
  • Mfr. Part No. M9F21402
Each
HK$3,201.50
In Stock
Schneider Electric RCBO, 20A Current Rating, 3P Poles, 30mA Trip Sensitivity, Type C, Resi9 Range
  • RS Stock No. 130-504
  • Mfr. Part No. R9PDCS20
Each
HK$4,849.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 63A, Breaking Capacity 55 kA, DIN Rail Mount
  • RS Stock No. 271-9396
  • Mfr. Part No. 3VA1163-5GD42-0AA0
Each
HK$4,326.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 2.5 kA, Fixed Mount
  • RS Stock No. 270-4754
  • Mfr. Part No. 3VA2163-7JQ42-0AA0
Each
HK$19,279.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4555
  • Mfr. Part No. 3VA2125-7HL46-0AA0
Each
HK$10,462.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4644
  • Mfr. Part No. 3VA2140-7HK32-0AA0
Each
HK$7,845.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 50A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3739
  • Mfr. Part No. 3VA1150-5EF46-0AA0
Each
HK$5,275.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 209-4845
  • Mfr. Part No. 3VA1063-4ED32-0AA0
Each
HK$2,766.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 16A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 211-3745
  • Mfr. Part No. 3VA1196-4EE32-0AA0
Each
HK$3,176.60
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
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