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

2321 of 999+
Temporarily out of stock
Better World
Schneider Electric, Compact MCCB 4P 125A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 178-8233
  • Mfr. Part No. LV426378
Each
HK$6,938.66
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 260-241
  • Mfr. Part No. 3VA6225-8KQ31-0AA0
Each
HK$32,729.20
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 4P, 16A Curve D, 12 → 133V AC, 220 → 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 790-8721
  • Mfr. Part No. A9F55416
Each
HK$1,266.90
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 250A 3VA, 3 channels
  • RS Stock No. 156-735
  • Mfr. Part No. 3VA2325-5MQ32-0AA0
Each
HK$24,234.20
Temporarily out of stock
Siemens, SENTRON MCCB 3P 400A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 257-337
  • Mfr. Part No. 3VA5340-7EC31-1AA0
Each
HK$14,969.40
Temporarily out of stock
ABB RCBO, 20A Current Rating, 3P Poles, Type B
  • RS Stock No. 237-5067
  • Mfr. Part No. 2CSR253001R1205
Each
HK$2,567.31
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 500A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-3505
  • Mfr. Part No. 3VA1450-5EF42-0AA0
Each
HK$48,814.50
Temporarily out of stock
Schneider Electric Acti9 A9N1 MCB, 1P, 100A Curve D, 230-400V AC, 144V DC, 4.5 kA Breaking Capacity
  • RS Stock No. 212-101
  • Mfr. Part No. A9N18491
1 Pack of 12
HK$11,154.90
Temporarily out of stock
ABB, Tmax MCCB 3P 400A, Fixed Mount
  • RS Stock No. 237-5965
  • Mfr. Part No. 1SDA054337R1 T5S400 FF PR222-LSI 400A
Each
HK$13,389.30
Temporarily out of stock
Mersen 12A T Cartridge Fuse, 10 x 38mm
  • RS Stock No. 806-8439
  • Mfr. Part No. ATQR12
Each (In a Pack of 10)
HK$269.47
Temporarily out of stock
Hager BF RCD, 40A, 2 Pole, 300mA, Type AC
  • RS Stock No. 144-4864
  • Mfr. Part No. BF241
Each
HK$2,875.81
In Stock
Eaton 8A Slow-Blow Cartridge Fuse, 10 x 38mm
  • RS Stock No. 229-106
  • Mfr. Part No. C10M8 CYLINDRICAL FUSE 10 x 38 8A AM 500V AC
1 Pack of 10
HK$126.40
Temporarily out of stock
Eaton RCBO, 20A Current Rating, 3+N Poles, 100mA Trip Sensitivity, Type C, xPole Range
  • RS Stock No. 231-779
  • Mfr. Part No. 120679 mRB4-20/3N/C/01-A
Each
HK$4,129.51
Temporarily out of stock
Siemens SENTRON Electronic Circuit Breaker 400A 3VA, 3 channels
  • RS Stock No. 155-840
  • Mfr. Part No. 3VA2440-5MP32-0AF0
Each
HK$27,060.10
Temporarily out of stock
Siemens SENTRON 5SY7 MCB, 2P, 25A Curve D, 400V AC, 60V DC, 25 kA Breaking Capacity
  • RS Stock No. 610-538
  • Mfr. Part No. 5SY7225-8
Each
HK$1,282.66
Temporarily out of stock
ABB Tmax XT Flexible Bar for use with Tmax XT
  • RS Stock No. 237-6173
  • Mfr. Part No. 1SDA066958R1 FB XT1 4PCS
Each
HK$252.20
In Stock
Eaton PC Board Non Resettable Fuse, Radial 2.5A, 250V ac
  • RS Stock No. 769-3264
  • Mfr. Part No. SR-5F-2-5A-BK
Each (In a Pack of 5)
HK$11.002
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IUGN66 2 Pole Panel Mount, 10A Current Rating
  • RS Stock No. 275-0290
  • Mfr. Part No. IUGN66-1-72-10.0
1 Box of 5
HK$5,221.40
In Stock
Better World
Schneider Electric Acti 9 C60H-DC MCB, 2P, 3A Curve C, 500V DC
  • RS Stock No. 772-1527
  • Mfr. Part No. A9N61523
Each
HK$1,385.30
Temporarily out of stock
ABB RCBO, 40A Current Rating, 1P Poles, Type C
  • RS Stock No. 237-5228
  • Mfr. Part No. 2CSR275051R0404
Each
HK$1,508.96
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