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

47266 Products showing for Fuses & Circuit Breakers

37 of 999+
In Stock
Eaton 1.25A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1199
  • Mfr. Part No. S500-1.25-R
Each (In a Pack of 10)
HK$2.48
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9649
  • Mfr. Part No. 3VA11103GD460AA0
Each
HK$5,402.20
In Stock
Better World
Schneider Electric RCBO, 32A Current Rating, 1P+N Poles, 10mA Trip Sensitivity, Acti 9 Range
  • RS Stock No. 790-9342
  • Mfr. Part No. A9D10832
Each
HK$1,800.75
In Stock
RS PRO Non Resettable Fuse 1A, 250V ac
  • RS Stock No. 139-952
1 Bag of 10
HK$149.06
Temporarily out of stock
RS PRO Industrial Surge Protector, 2000A, 20 V, DIN Rail Mount
  • RS Stock No. 101-779
Each
HK$624.27
Temporarily out of stock
Better World
Siemens SENTRON 5SY7 MCB, 4P, 1A Curve C, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8974
  • Mfr. Part No. 5SY7401-7
Each
HK$1,682.20
In Stock
Eaton 160A Centred Tag Fuse, NH1, 690V
  • RS Stock No. 182-1609
  • Mfr. Part No. 170M3814D
Each
HK$2,835.70
Temporarily out of stock
Eaton 16A British Standard Fuse, A1, 550V ac, 44.5mm
  • RS Stock No. 413-305
  • Mfr. Part No. NITD16
Each (In a Pack of 5)
HK$139.38
In Stock
Littelfuse Fuse Puller Fuse Kit
  • RS Stock No. 820-7274
  • Mfr. Part No. 00940480Z
Each
HK$491.80
In Stock
Schurter CSO Silver Plated Copper Alloy PCB Mount Fuse Clip for 10.3 x 38mm Cartridge Fuse
  • RS Stock No. 173-8114
  • Mfr. Part No. 0751.0506
1 Box of 1000
HK$6,721.80
In Stock
ETA Thermal Circuit Breaker - 3600 Single Pole 250V Voltage Rating Panel Mount, 8A Current Rating
  • RS Stock No. 729-2852
  • Mfr. Part No. 3600-P10-Si-8A
Each
HK$817.60
In Stock
Phoenix Contact CLIPLINE Electronic Circuit breaker 2A 24V PTCB E1, 1 channels
  • RS Stock No. 220-5802
  • Mfr. Part No. 1135749
Each
HK$358.60
In Stock
Phoenix Contact Electronic Device Circuit Breaker Electronic Circuit breaker 10A 24V CBMC, 1 channels , DIN Rail Mount
  • RS Stock No. 207-2719
  • Mfr. Part No. 2906032
Each
HK$1,061.70
Temporarily out of stock
Siemens SENTRON Cover Frame for use with 3VA51
  • RS Stock No. 162-024
  • Mfr. Part No. 3VA9033-0SB10
Each
HK$337.30
Temporarily out of stock
Siemens SENTRON 3VA9 Mounting Kit for use with 3VA2 100/160/250
  • RS Stock No. 218-1800
  • Mfr. Part No. 3VA9126-0SS10
Each
HK$189.80
Temporarily out of stock
Better World
Siemens RCCB, 63A, 4 Pole, 30mA, Type A, 400V
  • RS Stock No. 269-9763
  • Mfr. Part No. 5SV3346-6KK60
Each
HK$6,758.90
Temporarily out of stock
Better World
Siemens 5SV3 RCCB, 63A, 4 Pole, 300mA, Type A
  • RS Stock No. 124-7744
  • Mfr. Part No. 5SV3646-6KK12
Each
HK$1,773.10
Temporarily out of stock
Better World
Siemens 3VA92 RCD, 250A, 3 Pole, Type A
  • RS Stock No. 210-9326
  • Mfr. Part No. 3VA9213-0RL20
Each
HK$12,834.70
In Stock
Better World
Siemens 5SV3 RCCB, 25A, 2 Pole, 30mA, Type A
  • RS Stock No. 124-7728
  • Mfr. Part No. 5SV3312-6KK12
Each
HK$643.30
In Stock
Better World
Siemens 5SV3 RCCB, 40A, 4 Pole, 300mA, Type A
  • RS Stock No. 124-7741
  • Mfr. Part No. 5SV3644-6
Each
HK$653.90
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