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

2234 of 999+
Temporarily out of stock
315A Tag Fuse, 86 x 150mm, 690V
  • RS Stock No. 263-284
  • Mfr. Part No. 315NHG3B-690 NH FUSE 315A 690V gG SIZE 3
1 Pack of 3
HK$778.50
Temporarily out of stock
Better World
Siemens, 0AA0 MCCB 3P 160A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 211-5992
  • Mfr. Part No. 3VA1116-6EE36-0AA0
Each
HK$6,993.20
Temporarily out of stock
ABB 400A Tag Fuse, 150 x 51 x 72mm, 500V
  • RS Stock No. 251-3483
  • Mfr. Part No. 1SCA022627R6270
1 Box of 3
HK$1,110.21
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 4P, 13A Curve C, 400V AC, 60V DC, 30 kA Breaking Capacity
  • RS Stock No. 610-564
  • Mfr. Part No. 5SY8613-7
Each
HK$2,018.30
In Stock
ETA Thermal Circuit Breaker - 2 5700 Single Pole 250V Voltage Rating Panel Mount, 6A Current Rating
  • RS Stock No. 729-2754
  • Mfr. Part No. 2-5700-IG2-P10-DD-000040-6A
Each
HK$207.60
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 2P, 500mA, Type A, 400V AC, 72V DC, 35 kA Breaking Capacity
  • RS Stock No. 610-291
  • Mfr. Part No. 5SY4205-5
Each
HK$1,169.48
In Stock
Europa EUC2P EUC MCB, 2P, 63A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6563
  • Mfr. Part No. EUC2P63C
Each
HK$137.40
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 630A Ekip Touch LSI, 4 channels
  • RS Stock No. 259-3411
  • Mfr. Part No. 1SDA071345R1
Each
HK$51,969.32
In Stock
ETA Thermal Circuit Breaker - 3120-N 5 Pole 50 V DC, 240 V AC Voltage Rating, 3A Current Rating
  • RS Stock No. 210-2090
  • Mfr. Part No. 3120-N551-H7T1-W02D-3A
Each
HK$262.43
In Stock
SIBA 20A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 768-6125
  • Mfr. Part No. 5021526.20
Each
HK$96.00
Temporarily out of stock
RS PRO SMD Non-Resettable Surface Mount Fuse 1A, 63V
  • RS Stock No. 252-2166
Each (On a Tape of 4000)
HK$1.273
In Stock
RS PRO 10A Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 178-4177
Each (In a Pack of 50)
HK$3.388
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-3918
  • Mfr. Part No. 3VA2110-0HL36-0AA0
Each
HK$11,090.30
Temporarily out of stock
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX100 DC
  • RS Stock No. 260-9364
  • Mfr. Part No. C103TM080D
Each
HK$2,455.10
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 257-728
  • Mfr. Part No. 3VA5560-7EC36-0AA0
Each
HK$31,892.10
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 63A, Fixed Mount
  • RS Stock No. 260-7665
  • Mfr. Part No. C11N4TM063L
Each
HK$7,015.22
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 10A Curve B, 400V AC, 72V DC
  • RS Stock No. 210-3387
  • Mfr. Part No. 5SL4610-6
Each
HK$1,177.50
Temporarily out of stock
Eaton RCBO, 6A Current Rating, 4P Poles, 30mA Trip Sensitivity, Type A, Type D, FRBm6 Range
  • RS Stock No. 123-028
  • Mfr. Part No. 171008 FRBM6-D6/3N/003-A
Each
HK$2,093.26
Temporarily out of stock
Eaton xEffect FAZ MCB, 4P, 63A Curve C, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 242-994
  • Mfr. Part No. 190794 FAZ-C63/4-NA
Each
HK$3,878.39
In Stock
ABB RCBO, 20A Current Rating, 2P Poles, 30mA Trip Sensitivity
  • RS Stock No. 231-9936
  • Mfr. Part No. 2CSR255151R1205 DSE201 B20 A30
Each
HK$600.00
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