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

50 of 999+
In Stock
Better World
Siemens Sentron 5SY4 MCB, 4P, 6A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3192
  • Mfr. Part No. 5SY4406-8
Each
HK$1,698.30
In Stock
ABB RCBO, 32A Current Rating, 4P Poles, Type C
  • RS Stock No. 237-5102
  • Mfr. Part No. 2CSR254001R1324
Each
HK$2,531.00
Temporarily out of stock
Better World
ABB System Pro M Compact S200M MCB, 4P, 20A Curve B, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 746-8093
  • Mfr. Part No. 2CDS274001R0205 S204M-B20
Each
HK$1,109.10
In Stock
Better World
Siemens Sentron 5SY4 MCB, 1P, 10A Curve B, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 383-1964
  • Mfr. Part No. 5SY4110-6
Each
HK$400.20
In Stock
Eaton 2A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1177
  • Mfr. Part No. S500-2-R
Each (In a Pack of 10)
HK$3.08
In Stock
Eaton 20A Bolt In Mount 6.3 x 32mm Fuse Block, 300V ac/dc
  • RS Stock No. 852-7225
  • Mfr. Part No. S-8201-1-R
Each
HK$9.30
Temporarily out of stock
Siemens, SENTRON MCCB 4P 200A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 257-358
  • Mfr. Part No. 3VA5320-6EC41-0AA0
Each
HK$15,031.20
In Stock
Better World
ABB System Pro M Compact S200 MCB, 2P, 20A Curve B, 400V AC, 110V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-7564
  • Mfr. Part No. 2CDS252001R0205 S202-B20
Each
HK$449.30
In Stock
Eaton 20A Rail Mount Fuse Holder
  • RS Stock No. 418-631
  • Mfr. Part No. RS20LOCK
Each (In a Pack of 3)
HK$870.20
In Stock
Bulgin 6.3A Base Mount Fuse Holder for 5 x 20mm Fuse, 250V ac
  • RS Stock No. 782-3702
  • Mfr. Part No. FX0267
Each
HK$36.50
In Stock
Littelfuse 20A Inline Fuse Holder for ATO Fuse, 32V dc
  • RS Stock No. 787-4356
  • Mfr. Part No. FHAC0001ZXJG
Each
HK$38.10
In Stock
Schurter 16A Panel Mount Fuse Holder for 6.3 x 32, 5 x 20mm Fuse, 1P, 500V ac
  • RS Stock No. 866-3592
  • Mfr. Part No. 0031.2308
Each
HK$66.80
In Stock
Littelfuse 30A PCB Mount Fuse Holder, 80V
  • RS Stock No. 410-7672
  • Mfr. Part No. 178.6165.0002
Each
HK$33.20
In Stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 20A Curve D, 440V AC, 12V DC, 6 kA Breaking Capacity
  • RS Stock No. 527-9611
  • Mfr. Part No. 2CDS253001R0201 S203-D20
Each
HK$536.80
Temporarily out of stock
Siemens SENTRON Undervoltage Release for use with 3VA1, 3VA20 → 3VA25
  • RS Stock No. 210-9414
  • Mfr. Part No. 3VA9908-0BB23
Each
HK$1,364.30
Temporarily out of stock
Phoenix Contact CAPAROC Electronic Circuit Breaker 4A 12 → 24V E1 12-24DC, 1 channels , Plug-On
  • RS Stock No. 269-7940
  • Mfr. Part No. 1115415
Each
HK$458.00
In Stock
ETA REX12 Electronic Circuit breaker 4A 24V REX12-T, DIN Rail Mount
  • RS Stock No. 175-0372
  • Mfr. Part No. REX12-TA2-107-DC24V-4A/4A
Each
HK$595.90
In Stock
ABB Busbar for use with Miniature Circuit Breakers
  • RS Stock No. 250-4772
  • Mfr. Part No. 2CDL701301R0320
1 Box of 10
HK$453.10
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA9603
  • RS Stock No. 269-7226
  • Mfr. Part No. 3VA9603-0QB01
Each (In a Pack of 3)
HK$1,102.633
Temporarily out of stock
Siemens SENTRON Front Plate for use with 3VA1
  • RS Stock No. 269-7061
  • Mfr. Part No. 3VA9112-0SG20
Each (In a Pack of 5)
HK$21.96
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