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

46528 Products showing for Fuses & Circuit Breakers

2240 of 999+
Eaton Moeller Door Coupling Handle for use with PKZM0, PKZM4
  • RS Stock No. 273-6417
  • Mfr. Part No. 106136 PKZ0-XH-MCC
Each
HK$675.26
Wickmann PC Board Non Resettable Fuse, Radial 630mA, 250V ac
  • RS Stock No. 296-3284
  • Mfr. Part No. 3720630000
Each (In a Pack of 10)
HK$5.29
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 268-438
  • Mfr. Part No. 3VA6110-7KQ41-2AA0
Each
HK$25,363.00
Eaton xEffect MCB, 1P, 3A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4630
  • Mfr. Part No. 239032 FAZ6-C3/1
Each
HK$269.30
Wickmann SMD Non Resettable Fuse 5A, 125V
  • RS Stock No. 174-0681
  • Mfr. Part No. 0453005.MR
Each (In a Pack of 5)
HK$9.18
Eaton xEffect MCB, 2A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4589
  • Mfr. Part No. 239056 FAZ6-C2/1N
Each
HK$690.50
SIBA 500mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 418-9501
  • Mfr. Part No. 70-059-61/0.5A
Each (In a Pack of 10)
HK$1.94
Better World
Schneider Electric Flexible Busbar Trunking, 0.5m, 40A, Canalis KBB Series
  • RS Stock No. 211-0382
  • Mfr. Part No. KBB40DF4405W
Each
HK$1,922.90
Eaton 20A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 181-8888
  • Mfr. Part No. C14M20
Each
HK$18.40
Better World
Siemens SENTRON 5SV6016 Fire Safety Circuit Breaker, 2P, 20A Curve C, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 187-5251
  • Mfr. Part No. 5SV6016-7KK20
Each
HK$1,831.90
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9772
  • Mfr. Part No. 3VA1116-4FE42-0AA0
Each
HK$9,630.80
Phoenix Contact 4A T Cartridge Fuse, 5 x 20mm
  • RS Stock No. 129-484
  • Mfr. Part No. 1205749
Each
HK$95.00
ABB System Pro M Compact S200 M UC MCB, 1P, 2A Curve K, 230V AC, 220V DC, 10 kA Breaking Capacity
  • RS Stock No. 200-028
  • Mfr. Part No. 2CDS271061R0277
Each
HK$1,161.85
Siemens SENTRON 5SJ MCB, 1P, 20A
  • RS Stock No. 232-2237
  • Mfr. Part No. 5SJ4120-7HG40
Each
HK$436.50
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 250-186
  • Mfr. Part No. 3VA6580-5JT46-2AA0
Each
HK$80,358.00
Schneider Electric PowerPacT H Lug Connector for use with Circuit Breaker
  • RS Stock No. 438-778
  • Mfr. Part No. S37423
Each
HK$709.46
Littelfuse 0.2A Resettable Fuse, 30V dc
  • RS Stock No. 787-4192
  • Mfr. Part No. 1210L020WR
Each (In a Pack of 10)
HK$2.10
Better World
Schneider Electric TeSys Thermal Circuit Breaker - GV4L 3 Pole 690V ac Voltage Rating, 50A Current Rating
  • RS Stock No. 175-1444
  • Mfr. Part No. GV4L50N6
Each
HK$4,768.98
ABB SU200 M MCB, 4P, 6A Curve C, 480V AC, 15 kA Breaking Capacity
  • RS Stock No. 200-841
  • Mfr. Part No. 2CDS274337R0064
Each
HK$4,009.16
Mersen 2A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 188-6956
  • Mfr. Part No. D213098
Each (In a Pack of 10)
HK$14.63
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