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

2296 of 999+
Temporarily out of stock
Siemens SENTRON Positioning Unit for use with For Circuit Breaker
  • RS Stock No. 265-643
  • Mfr. Part No. 8US1998-1DA45
1 Pack of 10
HK$438.50
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 630A, Fixed Mount
  • RS Stock No. 260-8260
  • Mfr. Part No. C63W35E630
Each
HK$62,759.72
In Stock
Siemens 10A Cartridge Fuse
  • RS Stock No. 210-6990
  • Mfr. Part No. 3NW1100-0HG
Each (In a Pack of 10)
HK$236.03
Temporarily out of stock
ABB System Pro M Compact S200M MCB, 1+N, 13A Curve C, 230V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 200-580
  • Mfr. Part No. 2CDS271103R0134
Each
HK$983.64
In Stock
Mersen 63A Neutral Link for A3 Fuses
  • RS Stock No. 178-1172
  • Mfr. Part No. H239138 / BNEUTRALA3
Each (In a Pack of 10)
HK$21.123
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 5kA Ekip Hi-Touch LSI, 4 / f channels
  • RS Stock No. 259-3945
  • Mfr. Part No. 1SDA071989R1
Each
HK$400,934.13
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 160A, Fixed Mount
  • RS Stock No. 260-7897
  • Mfr. Part No. C25F4TM160
Each
HK$16,966.29
In Stock
Eaton 60A T Cartridge Fuse, 27 x 140mm
  • RS Stock No. 851-1630
  • Mfr. Part No. FRS-R-60
Each
HK$620.60
Temporarily out of stock
Better World
ABB System Pro M Compact S200 MCB, 2P, 16A Curve D, 400V AC, 125V DC, 10 kA Breaking Capacity
  • RS Stock No. 746-7863
  • Mfr. Part No. 2CDS252001R0161 S202-D16
Each
HK$490.97
In Stock
Mersen 315mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 270-3033
  • Mfr. Part No. F090510
Each (In a Box of 10)
HK$4.961
Temporarily out of stock
Lovato RCBO, 40A Current Rating, 1P + N Poles, 300mA Trip Sensitivity, Type A, P1RE1NC Range
  • RS Stock No. 276-5688
  • Mfr. Part No. P1RE1NC40A300
Each
HK$1,384.35
Temporarily out of stock
ABB, SACE Tmax T MCCB Molded Case Circuit Breaker 3P 320A, Fixed Mount
  • RS Stock No. 232-0094
  • Mfr. Part No. 1SDA054436R1 T5N400 FF TMA 320A
Each
HK$10,930.68
In Stock
Better World
Siemens Sentron 5SY6 MCB, 3P, 25A Curve B, 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 489-6647
  • Mfr. Part No. 5SY6325-6
Each
HK$649.10
Temporarily out of stock
Bourns Single, Three Phase Surge Protector, 50kA, 0.7kV, DIN Rail Mount
  • RS Stock No. 287-9615
  • Mfr. Part No. 1250A-1S-120
Each (In a Box of 100)
HK$626.00
In Stock
Eaton 3.15A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 849-5576
  • Mfr. Part No. GMA-3-15-R
Each
HK$32.10
In Stock
Mersen 2A Time Lag Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 630-889
  • Mfr. Part No. V090546Q
1 Box of 10
HK$61.49
Temporarily out of stock
ABB RCBO, 63A Current Rating, 3P Poles, Type B
  • RS Stock No. 237-5074
  • Mfr. Part No. 2CSR253001R1635
Each
HK$3,221.31
In Stock
Eaton 100A Bolted Tag Fuse, A3, 500V ac, 73mm
  • RS Stock No. 181-8663
  • Mfr. Part No. BAO100
Each
HK$207.28
In Stock
Littelfuse PC Board Non Resettable Fuse, Axial 10A, 125V ac/dc
  • RS Stock No. 541-3322
  • Mfr. Part No. 0251010.HAT1L
Each (In a Pack of 10)
HK$7.15
Temporarily out of stock
Eaton 32A Centred Tag Fuse, NH000, 690V
  • RS Stock No. 182-1769
  • Mfr. Part No. 170M1562D
Each
HK$1,567.20
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