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

2249 of 999+
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 257-525
  • Mfr. Part No. 3VA5580-5EC36-2AA0
Each
HK$41,350.90
Temporarily out of stock
Better World
Schneider Electric, ComPacT NSX MCCB 3P 16A, Fixed Mount
  • RS Stock No. 254-6303
  • Mfr. Part No. C11B3TM016L
Each
HK$4,050.65
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3P, 500mA Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6627
  • Mfr. Part No. 5SL4305-7
Each
HK$883.60
Temporarily out of stock
Hager RCBO, 16A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type F
  • RS Stock No. 602-091
  • Mfr. Part No. ADF916F
Each
HK$3,782.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 400A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-350
  • Mfr. Part No. 3VA6440-7HN41-0AA0
Each
HK$32,969.70
In Stock
Eaton RCD, 10A, 2 Pole, 30mA, Type B
  • RS Stock No. 922-8702
  • Mfr. Part No. 236067 PKNM-10/1N/B/003-MW
Each
HK$1,331.60
Temporarily out of stock
Eaton 7A Cartridge Fuse, 1.5 x 0.41in
  • RS Stock No. 229-130
  • Mfr. Part No. FNQ-7
1 Pack of 10
HK$5,662.20
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 4kA 1SDA07, 4 channels
  • RS Stock No. 259-3833
  • Mfr. Part No. 1SDA071847R1
Each
HK$288,692.21
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3723
  • Mfr. Part No. 3VA2025-8KQ42-0AA0
Each
HK$22,685.00
Temporarily out of stock
ABB SACE Emax 2 Fixed Part for use with Circuit Breaker
  • RS Stock No. 231-9314
  • Mfr. Part No. 1SDA073908R1 E1.2 W FP Iu=1600 4p HR
Each
HK$27,430.07
Temporarily out of stock
Littelfuse 20A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 337-5256
  • Mfr. Part No. 0KLK020.T
Each (In a Pack of 5)
HK$253.98
In Stock
Lovato ModuLo P1MB MCB, 2P, 25A Curve B, 230V AC, 80V DC, 10 kA Breaking Capacity
  • RS Stock No. 825-5683
  • Mfr. Part No. P1MB2PB25
Each
HK$368.00
Temporarily out of stock
ABB S800S MCB, 3P, 10A Curve D, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-566
  • Mfr. Part No. 2CCS863001R0101
Each
HK$5,937.43
Temporarily out of stock
Phoenix Contact Surge Protector, 6kA, 264V ac, Base Mounting Mount
  • RS Stock No. 496-914
  • Mfr. Part No. 1634908
Each (In a Pack of 50)
HK$905.818
Temporarily out of stock
Better World
Siemens SENTRON Wire Connector for use with 3VA52 250
  • RS Stock No. 269-7154
  • Mfr. Part No. 3VA9234-0JB11
Each (In a Pack of 4)
HK$109.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3776
  • Mfr. Part No. 3VA2040-7JP36-0AA0
Each
HK$26,336.40
Temporarily out of stock
Schneider Electric, Compact MCCB 4P 1.6kA, Fixed Mount
  • RS Stock No. 247-1840
  • Mfr. Part No. 33570
Each
HK$67,713.79
Temporarily out of stock
Better World
ABB, XT3N MCCB 4P 125A, Fixed Mount
  • RS Stock No. 236-6582
  • Mfr. Part No. 1SDA068067R1 XT3N 250 TMD 125A FF
Each
HK$7,217.90
Temporarily out of stock
Siemens 125A Cartridge Fuse, 22.2 x 58mm
  • RS Stock No. 627-153
  • Mfr. Part No. 3NC2211-0MK
1 Pack of 10
HK$2,211.50
Temporarily out of stock
ABB S803N MCB, 3P, 8A Curve C, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-910
  • Mfr. Part No. 2CCS893001R0084
Each
HK$4,476.43
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