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

177 of 999+
In Stock
Siemens SENTRON Motor Operator for use with 3VA20/21/22
  • RS Stock No. 157-028
  • Mfr. Part No. 3VA9267-0HC10
Each
HK$16,390.20
Temporarily out of stock
Siemens SENTRON 5SY6 MCB, 1P, 15A Curve C, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 610-636
  • Mfr. Part No. 5SY6118-7
Each
HK$289.54
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4087
  • Mfr. Part No. 3VA2116-7HL32-0AA0
Each
HK$12,582.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 25A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9574
  • Mfr. Part No. 3VA10253ED420AA0
Each
HK$3,668.30
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 63A, Fixed Mount
  • RS Stock No. 260-9512
  • Mfr. Part No. C10N4TM063
Each
HK$7,504.98
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4036
  • Mfr. Part No. 3VA2110-8JQ32-0AA0
Each
HK$19,009.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4044
  • Mfr. Part No. 3VA2110-8KP46-0AA0
Each
HK$21,668.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4106
  • Mfr. Part No. 3VA2116-7JQ42-0AA0
Each
HK$25,575.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4083
  • Mfr. Part No. 3VA2116-6KQ36-0AA0
Each
HK$23,111.20
In Stock
Bourns 1.75A Resettable Fuse, 6V
  • RS Stock No. 245-9194P
  • Mfr. Part No. MF-NSMF175-2
Each (Supplied on a Reel)
HK$4.87
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. 271-9779
  • Mfr. Part No. 3VA1116-4GE46-0AA0
Each
HK$10,040.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 2.5 kA, Fixed Mount
  • RS Stock No. 270-4714
  • Mfr. Part No. 3VA2163-6HK42-0AA0
Each
HK$9,202.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 2.5 kA, Fixed Mount
  • RS Stock No. 270-4734
  • Mfr. Part No. 3VA2163-7HK42-0AA0
Each
HK$10,029.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4060
  • Mfr. Part No. 3VA2116-0HN42-0AA0
Each
HK$21,827.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 25A, Breaking Capacity 55 kA, DIN Rail Mount
  • RS Stock No. 271-9864
  • Mfr. Part No. 3VA1125-5GD42-0AA0
Each
HK$4,326.90
In Stock
Better World
Siemens RCBO, 6A Current Rating, 3P Poles, 30mA Trip Sensitivity, Type B, Sentron Range
  • RS Stock No. 243-6202
  • Mfr. Part No. 5SU1336-6FP06
Each
HK$1,992.80
Temporarily out of stock
Hager RCD, 25A, 2 Pole, 30mA
  • RS Stock No. 144-4843
  • Mfr. Part No. BDC225F
Each
HK$2,021.59
Temporarily out of stock
Hager Hager NQN Circuit Breaker, 4P, 6A Curve B, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 599-817
  • Mfr. Part No. NQN406
Each
HK$3,954.20
Temporarily out of stock
Hager Hager NSN Circuit Breaker, 4P, 63A Curve D, 415V AC, 15 kA Breaking Capacity
  • RS Stock No. 599-729
  • Mfr. Part No. NSN463
Each
HK$5,485.30
Temporarily out of stock
Better World
Schneider Electric, Compact MCCB 4P 100A, Breaking Capacity 20 kA, DIN Rail Mount
  • RS Stock No. 178-8142
  • Mfr. Part No. LV426227
Each
HK$4,132.19
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