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

2246 of 999+
Eaton 1 Phase Distribution Board, 4 Way, 125 A
  • RS Stock No. 124-3000
  • Mfr. Part No. EAM4 EAM4
Each
HK$1,019.30
Legrand 50A M Ceramic Cartridge Fuse, 22.2 x 58mm
  • RS Stock No. 266-3155
  • Mfr. Part No. 0 150 50
1 Box of 10
HK$952.96
Schneider Electric, ComPacT MCCB 4P 630A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 341-262
  • Mfr. Part No. C063L42AFM
Each
HK$112,994.02
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-265
  • Mfr. Part No. 3VA2125-5JP46-0AA0
Each
HK$14,043.80
1 Pole Non Fused Isolator Switch, 16 A
  • RS Stock No. 539-3694
  • Mfr. Part No. 4404.0001
Each
HK$27.70
Phoenix Contact 1 Phase Surge Arrester, DIN Rail Mount
  • RS Stock No. 131-793
  • Mfr. Part No. 2905646
Each
HK$2,460.92
Siemens SENTRON 3 Phase Busbar, 17.8mm Pitch
  • RS Stock No. 202-7130
  • Mfr. Part No. 5ST3614
Each (In a Pack of 10)
HK$76.06
Siemens 1.25kA Fuse Holder for NH4 Fuse, 1P, 690V
  • RS Stock No. 269-8372
  • Mfr. Part No. 3NH3530
Each
HK$1,675.00
Eaton xEffect MCB, 3P, 15A Curve C, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 847-3279
  • Mfr. Part No. 278872 FAZ-C15/3
Each
HK$725.00
Better World
Siemens RCBO, 16A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, Sentron Range
  • RS Stock No. 151-1208
  • Mfr. Part No. 5SU1356-6KK16
Each
HK$1,100.40
Europa RCCB, 100A, 4 Pole, 100mA, Type AC
  • RS Stock No. 916-0417
  • Mfr. Part No. EUR1100.100/4
Each
HK$1,058.50
Schneider Electric, ComPacT MCCB 4P 63A, Fixed Mount
  • RS Stock No. 260-7578
  • Mfr. Part No. C11E4TM063L
Each
HK$4,768.31
ABB S203M Circuit Breaker, 3+N, 16A Curve C, 440V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 287-6390
  • Mfr. Part No. 2CDS273103R0164
Each
HK$1,156.65
Better World
Siemens, 0AA0 MCCB 4P 63A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-6068
  • Mfr. Part No. 3VA2163-5HN46-0AA0
Each
HK$7,963.00
Bourns 2.5A Resettable Fuse, 16V
  • RS Stock No. 897-8967
  • Mfr. Part No. MF-MSMF250/16X-2
Each (In a Pack of 10)
HK$2.98
Siemens ALPHA Assembly Kit for use with 3VA1 Molded Case Circuit Breakers
  • RS Stock No. 629-373
  • Mfr. Part No. 8GK6730-4KK33
Each
HK$2,753.94
Eaton 2A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9401
  • Mfr. Part No. S500-2-R
1 Bag of 1000
HK$1,633.50
Better World
Schneider Electric RCBO, 20A Current Rating, 3P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 238-3275
  • Mfr. Part No. A9DB3720
Each
HK$6,263.18
Siemens SENTRON 5SP3263 MCB, 2P, 63A, Type E
  • RS Stock No. 231-8311
  • Mfr. Part No. 5SP3263-3
Each
HK$2,552.20
Siemens Surge Protector, Through Hole Mount
  • RS Stock No. 203-2171
  • Mfr. Part No. 3RA2923-3DA1
Each (In a Pack of 5)
HK$165.46
1
2246
2364
Results per page

Related links