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

213 of 999+
Temporarily out of stock
ABB S804N MCB, 4P, 8A Curve D, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 141-106
  • Mfr. Part No. 2CCS894001R0081
Each
HK$6,311.55
In Stock
Littelfuse 4A Surface Mount Fuse Block, 125V ac/dc
  • RS Stock No. 219-6125P
  • Mfr. Part No. 0154004.DR
Each (Supplied on a Reel)
HK$14.25
New product - Preorder today
Schneider Electric PowerLogic Mounting Hardware for use with PowerLogic PM5000 PM5560 Power Meter
  • RS Stock No. 654-535
  • Mfr. Part No. METSEPM55HK
Each
HK$443.47
Temporarily out of stock
Hager NEN MCB, 2P, 50A Curve B, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4968
  • Mfr. Part No. NEN250
Each
HK$2,047.38
Temporarily out of stock
Siemens 630A Tag Fuse, NH3mm, 1.8kV, 210mm
  • RS Stock No. 627-050
  • Mfr. Part No. 3NB1342-4KK11
1 Pack of 2
HK$12,793.10
Temporarily out of stock
ABB System Pro M Compact S200MUC MCB, 2P, 10A Curve K, 440V AC, 440V DC, 25 kA Breaking Capacity
  • RS Stock No. 231-9737
  • Mfr. Part No. 2CDS272061R0427 S202 MUC K 10A 10 KA
1 Box of 1
HK$1,894.20
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 50A, Fixed Mount
  • RS Stock No. 260-7621
  • Mfr. Part No. C11H3TM050L
Each
HK$5,829.00
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 2P, 80A
  • RS Stock No. 224-7889
  • Mfr. Part No. 3VA1180-5ED26-0AA0
Each
HK$3,354.60
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 1+N, 50A Curve B, 230V AC, 72V DC
  • RS Stock No. 209-7489
  • Mfr. Part No. 5SL4550-6
Each
HK$709.90
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 40A Curve B, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8955
  • Mfr. Part No. 5SY4640-6
Each
HK$1,625.50
In Stock
Schurter PC Board Non Resettable Fuse, Radial 100mA, 250V ac
  • RS Stock No. 173-9770
  • Mfr. Part No. 0034.6605
Each (In a Bag of 100)
HK$2.908
Temporarily out of stock
Siemens SENTRON 5SJ4132 MCB, 1P, 32A Curve D, 400V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 299-844
  • Mfr. Part No. 5SJ4132-8HG40
Each
HK$529.30
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 40A Curve B, 400V AC, 72V DC
  • RS Stock No. 209-7476
  • Mfr. Part No. 5SL4440-6
Each
HK$1,566.90
In Stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 25A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 746-7778
  • Mfr. Part No. 2CDS253001R0254 S203-C25
Each
HK$550.40
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 1+N, 300mA Curve D, 230V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8837
  • Mfr. Part No. 5SY4514-8
Each
HK$689.60
In Stock
Eaton xEffect MCB, 1P, 4A Curve D, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7030
  • Mfr. Part No. 278576 FAZ-D4/1
Each
HK$290.40
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 4P, 20A
  • RS Stock No. 224-7825
  • Mfr. Part No. 3VA1120-5GF42-0AA0
Each
HK$4,851.90
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 2P, 20A
  • RS Stock No. 224-7821
  • Mfr. Part No. 3VA1120-4ED26-0AA0
Each
HK$2,976.40
Temporarily out of stock
Hager BDH RCCB, 25A, 4 Pole, 30mA
  • RS Stock No. 602-178
  • Mfr. Part No. BDH825
Each
HK$4,189.80
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 3P, 60A Curve C, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 610-317
  • Mfr. Part No. 5SY4360-7
Each
HK$2,687.92
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