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

2334 of 999+
Socomec 500A NH Fuse, 4, 500V
  • RS Stock No. 252-5349
  • Mfr. Part No. 67460500
Each
HK$2,755.32
ABB Emax2 Electronic Circuit Breaker 1kA Ekip Touch LSI, 4 channels
  • RS Stock No. 259-4643
  • Mfr. Part No. 1SDA072915R1
Each
HK$71,724.05
Siemens ALPHA Busbar Support for use with ALPHA DIN Installation Distributor
  • RS Stock No. 272-0357
  • Mfr. Part No. 8GK9711-0KK07
Each
HK$178.60
Better World
Schneider Electric Acti 9 MCB, 1P, 25A Curve C, 230V AC, 7.5 kA Breaking Capacity
  • RS Stock No. 200-6162
  • Mfr. Part No. A9DV2625
Each
HK$2,235.60
Better World
ABB System Pro M Compact S200 MCB, 2P, 3A Curve C, 440V AC, 125V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-7693
  • Mfr. Part No. 2CDS252001R0034 S202-C3
Each
HK$511.10
Siemens ALPHA Assembly Kit for use with 3VL Molded Case Circuit Breakers
  • RS Stock No. 629-254
  • Mfr. Part No. 8GK4722-3KK10
Each
HK$1,499.58
ABB Emax2 Electronic Circuit Breaker 1.25kA Ekip Touch LI, 4 channels
  • RS Stock No. 259-4661
  • Mfr. Part No. 1SDA072934R1
Each
HK$63,554.81
Schneider Electric EasyPact Electronic Circuit Breaker 100A, Plug In
  • RS Stock No. 122-357
  • Mfr. Part No. LV510487P
Each
HK$1,688.96
Schneider Electric Thermal Circuit Breaker - GB2 1P + N Pole 250V ac Voltage Rating DIN Rail Mount, 500mA Current Rating
  • RS Stock No. 323-8983
  • Mfr. Part No. GB2CD05
Each
HK$263.40
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 5 kA, Withdrawable
  • RS Stock No. 231-402
  • Mfr. Part No. 113535 NZMN3-4-A400/250-AVE
Each
HK$31,082.94
Schneider Electric, ComPacT MCCB 3P 100A, Fixed Mount
  • RS Stock No. 260-7442
  • Mfr. Part No. C10S3
Each
HK$7,504.31
Littelfuse 0.12A Resettable Fuse, 48V dc
  • RS Stock No. 506-993
  • Mfr. Part No. NANOSMDC012F
Each (In a Pack of 10)
HK$2.19
Better World
Schneider Electric Acti9 iIDK RCCB, 25A, 2 Pole, 300mA, Type AC, 220 → 240V ac
  • RS Stock No. 238-3459
  • Mfr. Part No. A9R56225
Each
HK$1,397.39
Siemens SENTRON 5SY Circuit Breaker, 4P, 16A Curve D, 440V AC, 72V DC, 30 kA Breaking Capacity
  • RS Stock No. 664-321
  • Mfr. Part No. 5SY8416-8BB08
Each
HK$1,669.34
Better World
Schneider Electric RCBO, 20A Current Rating, 1P Poles, 300mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 238-3309
  • Mfr. Part No. A9DP6620
Each
HK$3,399.20
Better World
Schneider Electric, Masterpact MCCB 3P 4kA, Fixed Mount
  • RS Stock No. 248-3816
  • Mfr. Part No. LV848323
Each
HK$392,493.42
Siemens 5SV53 RCCB, 40A, 2 Pole, 30mA, Type A, 230V
  • RS Stock No. 328-524
  • Mfr. Part No. 5SV5314-6KL
Each
HK$881.71
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 3P 50A, Breaking Capacity 7.5 kA, Plug In
  • RS Stock No. 230-660
  • Mfr. Part No. 112769 NZMN1-S50-SVE
Each
HK$4,659.65
HENSEL ENYBOARD Distribution Board, 63 A
  • RS Stock No. 116-993
  • Mfr. Part No. KV 9112
Each
HK$909.50
Eaton xEffect FAZ MCB, 3P, 25A Curve D, 415V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 235-150
  • Mfr. Part No. 102272 FAZ-D25/3-NA
Each
HK$2,194.97
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