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

77 of 999+
In Stock
Bourns 0.75A Resettable Fuse, 24V
  • RS Stock No. 647-8184P
  • Mfr. Part No. MF-MSMF075/24-2
Each (Supplied on a Reel)
HK$2.84
Temporarily out of stock
Schneider Electric, ComPacT New Generation MCCB 3P 25A, Breaking Capacity 65 kA, Screw Mount
  • RS Stock No. 207-252
  • Mfr. Part No. BGL36025LU
Each
HK$4,691.20
Temporarily out of stock
Socomec 40A NH Fuse, 0, 500V
  • RS Stock No. 252-5331
  • Mfr. Part No. 66000040
Each (In a Pack of 3)
HK$179.577
Temporarily out of stock
Neozed Sicherungssockel D01, 1P, 16A, 40
  • RS Stock No. 537-817
  • Mfr. Part No. R9J01116
Each
HK$122.72
Temporarily out of stock
Schneider Electric Tap Off, Canalis Series
  • RS Stock No. 347-083
  • Mfr. Part No. KHB0250SE4
Each
HK$111,836.17
Temporarily out of stock
Eaton Fuse Holder Microswitch
  • RS Stock No. 182-1573
  • Mfr. Part No. 170H0069
Each
HK$592.50
Temporarily out of stock
Schneider Electric, PowerPact MCCB 3P 80A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 346-683
  • Mfr. Part No. NHJF36080TW
Each
HK$20,326.87
In Stock
Schneider Electric Acti9 A9N MCB, 4P, 125A, 440V AC, 10000 A Breaking Capacity
  • RS Stock No. 276-8732
  • Mfr. Part No. A9N18377
Each
HK$7,439.14
Temporarily out of stock
Siemens SENTRON Busbar
  • RS Stock No. 266-739
  • Mfr. Part No. 8US1941-2BA00
1 Pack of 3
HK$2,548.00
Temporarily out of stock
ABB S800S MCB, 2P, 40A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-932
  • Mfr. Part No. 2CCS862001R0557
Each
HK$4,704.12
Temporarily out of stock
Siemens SENTRON 5SJ4213 MCB, 2P, 12A Curve C, 400V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 299-863
  • Mfr. Part No. 5SJ4213-7HG42
Each
HK$1,358.40
Temporarily out of stock
Siemens 16A Base Mount Fuse Holder for D01 Fuse, 1P, 400V
  • RS Stock No. 156-047
  • Mfr. Part No. 5SG1302-1
1 Pack of 15
HK$1,604.90
Temporarily out of stock
Schneider Electric PowerPact J Long Rear Connection for use with PowerPact J
  • RS Stock No. 357-250
  • Mfr. Part No. S37437
Each
HK$4,882.31
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 800A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 654-488
  • Mfr. Part No. C080H420FM
Each
HK$51,606.60
Being discontinued
RS PRO 400mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 563-671
Each (In a Pack of 10)
HK$2.906
Temporarily out of stock
Better World
Schneider Electric Straight Busbar Trunking, 2m, 40A, KBB Series
  • RS Stock No. 219-8867
  • Mfr. Part No. KBB40ED44203W
Each
HK$1,844.77
Temporarily out of stock
Schneider Electric 400A Neutral Link for DIN Fuses
  • RS Stock No. 357-439
  • Mfr. Part No. LV481916
Each
HK$710.11
In Stock
Schurter 2.5A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 830-4237P
  • Mfr. Part No. 8020.5015.G
Each (Supplied in a Box)
HK$8.02
Temporarily out of stock
Hager 16A Cartridge Fuse, 14 x 51mm
  • RS Stock No. 250-8624
  • Mfr. Part No. LF416G
Each (In a Pack of 10)
HK$66.972
In Stock
ABB FH200 RCCB, 40A, 4 Pole, 30mA, Type AC, 230V
  • RS Stock No. 540-1650
  • Mfr. Part No. 2CSF204006R1400 FH204 AC-40/0,03
Each
HK$1,361.87
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