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

127 of 999+
Eaton 400A Bolted Tag Fuse, B4, 460 V dc, 660V ac, 111mm
  • RS Stock No. 182-1458
  • Mfr. Part No. TMF400M450
Each
HK$7,014.70
Legrand Busbar
  • RS Stock No. 255-2189
  • Mfr. Part No. 037434
Each (In a Pack of 10)
HK$976.86
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 25 kA
  • RS Stock No. 209-6811
  • Mfr. Part No. 3VA1140-3ED32-0AA0
Each
HK$2,814.20
Siemens 6A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 627-132
  • Mfr. Part No. 3NC1206-0MK
1 Pack of 20
HK$2,369.10
RS PRO Industrial Surge Protector, 40kA, 620 V, DIN Rail Mount
  • RS Stock No. 101-755
Each
HK$595.90
Better World
Siemens, SENTRON MCCB 4P 125A, Breaking Capacity 36 kA
  • RS Stock No. 209-6755
  • Mfr. Part No. 3VA1112-4EE42-0AA0
Each
HK$8,255.10
ABB High Performance S800S MCB, 2P, 80A Curve C, 400V AC, 250V DC, 50 kA Breaking Capacity
  • RS Stock No. 435-510
  • Mfr. Part No. 2CCG001229R0001
Each
HK$2,109.90
Schneider Electric 3, 3+N Phase Surge Arrester, 20kA, 1.1kV, DIN Rail Mount
  • RS Stock No. 654-797
  • Mfr. Part No. A9L20600
Each
HK$6,458.10
Siemens SENTRON Nut Keeper Kit for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9389
  • Mfr. Part No. 3VA9403-0QA00
Each
HK$391.40
Bourns Surface Mount Fuse 3A, 65V dc
  • RS Stock No. 245-9258P
  • Mfr. Part No. SF-1206SA300M-2
Each (Supplied on a Reel)
HK$7.08
SIBA SMD Non Resettable Fuse 250mA, 250V
  • RS Stock No. 736-2617P
  • Mfr. Part No. 160000.0,25
Each (Supplied on a Reel)
HK$76.69
Bourns Surface Mount Fuse 5A, 50 V dc, 63 V dc
  • RS Stock No. 245-9208P
  • Mfr. Part No. SF-0603SPA500R-2
Each (Supplied on a Reel)
HK$9.90
Siemens 500A Tag Fuse, 141.5mm, 800V, 107.5mm
  • RS Stock No. 608-865
  • Mfr. Part No. 3NE4334-0B
1 Pack of 3
HK$5,482.80
35A NH Fuse, 1.9 x 1 x 2.13in, 600V ac
  • RS Stock No. 262-588
  • Mfr. Part No. TCF35RN
1 Pack of 12
HK$14,235.30
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-413
  • Mfr. Part No. 3VA6210-5HL31-0AA0
Each
HK$16,712.00
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-662
  • Mfr. Part No. 3VA5210-7GD41-0AA0
Each
HK$15,956.90
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9647
  • Mfr. Part No. 3VA11103FF460AA0
Each
HK$5,734.80
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9644
  • Mfr. Part No. 3VA11103FE420AA0
Each
HK$5,226.20
Better World
Siemens, SENTRON MCCB 3P 20A, Breaking Capacity 36 kA
  • RS Stock No. 209-6771
  • Mfr. Part No. 3VA1120-4ED32-0AA0
Each
HK$2,919.30
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 20A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9565
  • Mfr. Part No. 3VA10203ED420AA0
Each
HK$3,608.60
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