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

2221 of 999+
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3589
  • Mfr. Part No. 3VA2010-7KP32-0AA0
Each
HK$29,691.30
Schneider Electric, ComPacT MCCB 3P 1.25kA, Breaking Capacity 42 kA, Fixed Mount
  • RS Stock No. 347-092
  • Mfr. Part No. C125H320FM
Each
HK$110,444.32
Siemens, SENTRON MCCB 3P 500A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 270-3501
  • Mfr. Part No. 3VA1450-4EF32-0KG0
Each
HK$37,743.20
Mersen 50A German Standard Fuse, NH000, 660V ac, 77.5mm
  • RS Stock No. 304-2776
  • Mfr. Part No. T330021
Each
HK$419.00
Siemens SENTRON Busbar
  • RS Stock No. 266-606
  • Mfr. Part No. 8US1928-5CA02
1 Pack of 10
HK$438.50
RS PRO SMD Non-Resettable Surface Mount Fuse 2A, 63V
  • RS Stock No. 252-2170
Each (On a Tape of 4000)
HK$1.273
Schneider Electric, PowerPact MCCB 3P 60A, Breaking Capacity 14 kA, DIN Rail Mount
  • RS Stock No. 345-083
  • Mfr. Part No. NHDF36060U53XTW
Each
HK$32,783.85
ABB 2 Phase Industrial Surge Protector, 100kA, 1.5kV
  • RS Stock No. 237-6639
  • Mfr. Part No. 2CTB803972R0500
Each
HK$2,973.10
SIBA 20A DII Diazed Fuse, E27 Thread Size, gR, 500V ac
  • RS Stock No. 422-551
  • Mfr. Part No. 10-005-07/20A
Each (In a Pack of 5)
HK$49.50
Bourns 225A Tag Fuse, 38mm, 800V ac/dc, 24.1mm
  • RS Stock No. 254-4146
  • Mfr. Part No. PF-FB2-225
Each (In a Box of 10)
HK$1,229.039
Siemens SIRIUS Undervoltage Release for use with Motor Circuit Breaker
  • RS Stock No. 157-847
  • Mfr. Part No. 3RV2922-2CP0
Each
HK$607.60
Siemens, SENTRON MCCB 3P 1.25kA, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 270-4899
  • Mfr. Part No. 3VA2612-7HM32-0AA0
Each
HK$126,313.60
Better World
Schneider Electric Multi 9 C60BP MCB, 2P, 35A Curve D, 440V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 211-2449
  • Mfr. Part No. M9F43235
Each
HK$1,489.80
Finder Busbar
  • RS Stock No. 400-4034
  • Mfr. Part No. 094.06
Each (In a Pack of 3)
HK$19.467
Siemens 230V ac Circuit Trip
  • RS Stock No. 223-7631
  • Mfr. Part No. 5TT4425-0
Each
HK$509.00
Eaton 31.5A Cartridge Fuses
  • RS Stock No. 246-012
  • Mfr. Part No. 12BFGHA31.5
1 Pack of 3
HK$14,277.10
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9770
  • Mfr. Part No. 3VA1116-4FD42-0AA0
Each
HK$9,431.40
Better World
Siemens, SENTRON MCCB 3P 250A, Breaking Capacity 55 kA
  • RS Stock No. 209-6941
  • Mfr. Part No. 3VA2325-5HL32-0AA0
Each
HK$14,270.20
Eaton xEffect MCB, 1P, 13A Curve C, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7005
  • Mfr. Part No. 278559 FAZ-C13/1
Each
HK$195.60
Bourns 1.85A Resettable Fuse, 30V
  • RS Stock No. 647-8588P
  • Mfr. Part No. MF-R185
Each (Supplied in a Bag)
HK$2.96
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