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

163 of 999+
In Stock
RS PRO 1A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 178-4176
Each (In a Pack of 50)
HK$3.242
Temporarily out of stock
ABB System Pro M Compact S200 MCB, 2P, 25A, Type Z, 400V AC, 125V DC, 10 kA Breaking Capacity
  • RS Stock No. 204-260
  • Mfr. Part No. 2CDS252001R0518
Each
HK$1,710.29
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 1P, 60A Curve C, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 610-290
  • Mfr. Part No. 5SY4160-7
Each
HK$640.39
In Stock
ABB System Pro M Compact S200 MCB, 2P, 6A Curve D, 230V AC, 125V DC, 20 kA Breaking Capacity
  • RS Stock No. 191-9449
  • Mfr. Part No. 2CDS252001R0061 S202-D6
Each
HK$662.43
Temporarily out of stock
ABB S800S MCB, 2P, 40A Curve D, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-911
  • Mfr. Part No. 2CCS862001R0401
Each
HK$4,480.42
In Stock
Eaton xEffect MCB, 1P, 63A Curve C, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7015
  • Mfr. Part No. 278567 FAZ-C63/1
Each
HK$240.20
In Stock
Mersen 2.5A FF Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 188-6754
  • Mfr. Part No. P084308
Each (In a Pack of 10)
HK$39.669
Temporarily out of stock
Eaton Eaton xEffect Conversion Kit for use with K3X185
  • RS Stock No. 243-942
  • Mfr. Part No. 032142 D-K3X185
Each
HK$529.21
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-641
  • Mfr. Part No. 3VA6580-5HN32-0AA0
Each
HK$38,337.50
Temporarily out of stock
Eaton Eaton xEnergy Main Base for use with Busbar
  • RS Stock No. 240-171
  • Mfr. Part No. 144596 XBSB-B
1 Pack of 10
HK$2,025.30
Temporarily out of stock
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 2P, 63A Curve B, 415V AC
  • RS Stock No. 256-6755
  • Mfr. Part No. M9F21263
Each
HK$2,043.70
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-195
  • Mfr. Part No. 3VA2125-8KP42-0AA0
Each
HK$20,534.80
Temporarily out of stock
SENTRON Terminal for use with 3VA52 Series
  • RS Stock No. 263-577
  • Mfr. Part No. 3VA9231-0QE20
Each
HK$388.00
Temporarily out of stock
20A Neutral Link x 5mm
  • RS Stock No. 252-909
  • Mfr. Part No. 20CML
1 Pack of 10
HK$544.90
Temporarily out of stock
100A Neutral Link x 5mm
  • RS Stock No. 263-042
  • Mfr. Part No. 63/100CML
1 Pack of 10
HK$912.20
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 1P, 25A
  • RS Stock No. 224-7828
  • Mfr. Part No. 3VA1125-3ED16-0AA0
Each
HK$1,001.20
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 30A, Breaking Capacity 10 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-347
  • Mfr. Part No. 3VA5130-6EF41-0AA0
Each
HK$3,878.40
Temporarily out of stock
SENTRON Wire Connector for use with 3VA55, 3VA65 Series
  • RS Stock No. 263-774
  • Mfr. Part No. 3VA9573-0JG23
1 Kit
HK$2,876.50
Temporarily out of stock
Siemens SENTRON Auxiliary Switch Kit for use with Circuit Breaker 3VA1
  • RS Stock No. 272-0225
  • Mfr. Part No. 3VA9467-0GX10
Each
HK$757.50
Temporarily out of stock
Siemens SENTRON Adapter for use with 3VA15/25/26
  • RS Stock No. 161-885
  • Mfr. Part No. 3VA9670-0LF20
Each
HK$1,104.00
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