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

82 of 999+
In Stock
Europa EUC3P EUC MCB, 3P, 25A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6597
  • Mfr. Part No. EUC3P25C
Each
HK$151.30
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 60A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 269-716
  • Mfr. Part No. 3VA5260-6ED31-2AA0
Each
HK$8,454.30
Temporarily out of stock
Schneider Electric Industrial Surge Protection, 8kA, 400V (Volts), Clip-On Mount
  • RS Stock No. 340-981
  • Mfr. Part No. A9L08300
Each
HK$2,511.19
Temporarily out of stock
Eaton xEffect RCCB, 40A, 4 Pole, 30mA, Type F, 240V ac
  • RS Stock No. 246-774
  • Mfr. Part No. 187409 FRCMM-40/4/003-G/F
Each
HK$2,601.50
Temporarily out of stock
Schneider Electric, PowerPact MCCB 1P 110A, Breaking Capacity 65 kA, Clip-On
  • RS Stock No. 428-844
  • Mfr. Part No. BJF16110
Each
HK$8,812.97
Temporarily out of stock
Siemens SENTRON Withdrawable Unit for use with Circuit Breaker
  • RS Stock No. 157-794
  • Mfr. Part No. 3VA9324-0KD10
Each
HK$5,709.10
In Stock
TE Connectivity 30A Fuse Holder for 10 x 38mm Fuse, 1P, 600V
  • RS Stock No. 299-082
  • Mfr. Part No. 1SNF100031R0000
Each
HK$50.80
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 4P, 63A, Type A, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 610-627
  • Mfr. Part No. 5SY4663-5
Each
HK$4,385.55
In Stock
Europa EUC1P EUB MCB, 1P, 4A Curve B, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6456
  • Mfr. Part No. EUC1P4B
Each
HK$72.90
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 4P 63A, Fixed Mount
  • RS Stock No. 236-6540
  • Mfr. Part No. 1SDA068012R1 XT2V 160 Ekip I 63A FF
Each
HK$11,351.90
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 1.6kA, Breaking Capacity 42 kA, Fixed Mount
  • RS Stock No. 345-333
  • Mfr. Part No. C160H45AFM
Each
HK$166,389.34
Temporarily out of stock
Eaton 400A Tag Fuse, 64 x 225mm, 660V
  • RS Stock No. 261-687
  • Mfr. Part No. TMT400
Each
HK$2,317.70
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 3P, 32A, Type A, 400V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 610-428
  • Mfr. Part No. 5SY4332-5
Each
HK$2,018.30
In Stock
Better World
Schneider Electric Acti 9 Acti9 iDT40N XA MCB, 3P, 20A Curve C, 400V AC
  • RS Stock No. 239-9982
  • Mfr. Part No. A9PA4320
Each
HK$1,534.30
In Stock
TE Connectivity 30A Fuse Holder for 10 x 38mm Fuse, 1P, 600V
  • RS Stock No. 299-080
  • Mfr. Part No. 1SNF100030R0000
Each
HK$57.30
Temporarily out of stock
Eaton 40A Cartridge Fuses, 63.5 x 359mm
  • RS Stock No. 254-751
  • Mfr. Part No. 24OEGMA40
1 Pack of 3
HK$12,392.00
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 3+N, 16A Curve D, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 203-787
  • Mfr. Part No. 2CDS383103R0161
Each
HK$4,005.73
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 3P 400A, Fixed Mount
  • RS Stock No. 250-4114
  • Mfr. Part No. 1SDA054381R1
Each
HK$40,436.67
In Stock
Better World
Schneider Electric Busbar Tap-Off Unit, Canalis Series
  • RS Stock No. 248-4068
  • Mfr. Part No. KBC16DCB21
Each
HK$251.60
Temporarily out of stock
Eaton 400A Tag Fuse, 54 x 150mm, 500V
  • RS Stock No. 261-576
  • Mfr. Part No. 400NHG03BI NH FUSE 400A 500V GL/GG SIZE 03
1 Pack of 3
HK$574.70
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