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

2345 of 999+
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 4P 630A, Fixed Mount
  • RS Stock No. 250-4147
  • Mfr. Part No. 1SDA054418R1
Each
HK$50,046.03
In Stock
Mersen 3.15A F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 270-3001
  • Mfr. Part No. A090574
Each (In a Box of 10)
HK$5.01
Temporarily out of stock
Eaton 40A NH Fuse, NH000, 690V ac
  • RS Stock No. 181-8478
  • Mfr. Part No. 40NHM000B-690
1 Box of 3
HK$218.46
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 400A, Fixed Mount
  • RS Stock No. 260-8141
  • Mfr. Part No. C40R42D400
Each
HK$42,038.00
In Stock
Mersen 20A Bolted Tag Fuse, A2, 460 V dc, 690V ac, 73mm
  • RS Stock No. 178-1101
  • Mfr. Part No. R1019260 / BTIA69V20M32
Each (In a Pack of 10)
HK$52.94
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - LEGH66 2 Pole Panel Mount, 5A Current Rating
  • RS Stock No. 275-0354
  • Mfr. Part No. LEGH66-1-63-5.00-A-01-V
1 Box of 5
HK$4,396.30
Temporarily out of stock
Eaton Enclosure for use with Circuit Breakers, Switch Disconnectors
  • RS Stock No. 103-801
  • Mfr. Part No. 138541 MCCB2-200/I43E-200
Each
HK$2,797.35
In Stock
Better World
Schneider Electric Multi 9 MCB, 2P, 8A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 219-9125
  • Mfr. Part No. M9F22208
Each
HK$1,236.40
Temporarily out of stock
Schneider Electric Flexible Elbow Busbar Trunking, 1.2m, 400A, Canalis Series
  • RS Stock No. 340-958
  • Mfr. Part No. KSA400DLF43F
Each
HK$21,116.60
Temporarily out of stock
Eaton xEffect FAZ MCB, 3P, 16A Curve C, 415V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 241-224
  • Mfr. Part No. 102290 FAZ-C16/3-RT
Each
HK$1,990.35
Temporarily out of stock
Better World
Schneider Electric Acti 9 Acti9 iDT40T XA MCB, 3P, 20A Curve C, 400V AC
  • RS Stock No. 238-3423
  • Mfr. Part No. A9PA2320
Each
HK$1,052.50
Temporarily out of stock
Schneider Electric Panelset Busbar
  • RS Stock No. 444-372
  • Mfr. Part No. NSYTBCN3125
Each
HK$20,218.51
Temporarily out of stock
Schneider Electric, PowerPact MCCB 3P 60A, Breaking Capacity 18 kA, DIN Rail Mount
  • RS Stock No. 429-281
  • Mfr. Part No. NHGL36060U31X
Each
HK$20,747.16
Temporarily out of stock
Eaton 300A Centred Tag Fuse, 50.80 x 85.85mm, 600V ac
  • RS Stock No. 182-1363
  • Mfr. Part No. JKS-300
Each
HK$8,501.80
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 4P 63A, Fixed Mount
  • RS Stock No. 236-7517
  • Mfr. Part No. 1SDA067835R1 XT2S 160 Ekip LS/I 63A FF
Each
HK$6,701.37
Temporarily out of stock
ABB S303 MCB, 3P, 1A Curve D, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 201-322
  • Mfr. Part No. 2CDS383001R0011
Each
HK$3,910.58
Temporarily out of stock
Socomec 100A Rail Mount Fuse Holder for 22 x 58mm Fuse, 3P, 690V
  • RS Stock No. 233-3335
  • Mfr. Part No. 57035003
Each (In a Pack of 2)
HK$642.90
Temporarily out of stock
ABB Tmax XT Conversion Kit for use with Circuit Breaker
  • RS Stock No. 232-0165
  • Mfr. Part No. 1SDA066278R1 P MP XT2 3P
Each
HK$561.73
In Stock
ETA Thermal Magnetic Circuit Breaker - 3400 Single Pole Panel Mount, 15A Current Rating
  • RS Stock No. 122-9319
  • Mfr. Part No. 3400-P10-H-SI-15A
Each
HK$779.30
In Stock
Lovato ModuLo P1MB MCB, 3P, 4A Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 825-5876
  • Mfr. Part No. P1MB3PD04
Each
HK$667.40
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