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

2276 of 999+
In Stock
SIBA 10A M Ceramic Cartridge Fuse, 5 x 25mm
  • RS Stock No. 267-3470
  • Mfr. Part No. 70-010-05/10A
Each (In a Pack of 5)
HK$34.12
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 2kA Ekip Dip LI, 4 channels
  • RS Stock No. 259-3746
  • Mfr. Part No. 1SDA071731R1
Each
HK$123,025.20
In Stock
Better World
Schneider Electric Compact Changeover Contact for use with Compact Nsx100 To Nsx630
  • RS Stock No. 221-1205
  • Mfr. Part No. LV429346
Each
HK$1,459.37
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-819
  • Mfr. Part No. 3VA6110-7KT41-0AA0
Each
HK$20,675.50
Temporarily out of stock
Europa EUR1 RCCB, 40A, 2 Pole, 30mA, Type A, 230V ac
  • RS Stock No. 210-4752
  • Mfr. Part No. EUR140.30/2A
Each
HK$453.37
Temporarily out of stock
Legrand DX Range DX3 MCB, 32A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 731-9698
  • Mfr. Part No. 4 077 03
Each
HK$1,141.58
In Stock
Mersen 25A Slow-Blow Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 247-2786
  • Mfr. Part No. H213608
1 Box of 10
HK$710.20
Temporarily out of stock
Eaton IZMX/INX Electronic Circuit Breaker 1.6kA , Fixed
  • RS Stock No. 132-869
  • Mfr. Part No. 183713 IZMX40N3-V16F-1
Each
HK$98,021.47
Temporarily out of stock
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX400/630 Circuit Breakers
  • RS Stock No. 260-8078
  • Mfr. Part No. C4042D250
Each
HK$19,276.98
In Stock
Better World
ABB SN201 MCB, 1+N, 2A, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 231-9969
  • Mfr. Part No. 2CSS255101R0024 SN201-C2 -
1 Box of 1
HK$347.91
Temporarily out of stock
Better World
Siemens, 0AA0 MCCB 4P 40A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 211-6066
  • Mfr. Part No. 3VA2140-6KP42-0AA0
Each
HK$17,266.90
Temporarily out of stock
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 2P, 2A Curve C, 277V AC
  • RS Stock No. 256-6795
  • Mfr. Part No. M9F52202
Each
HK$2,256.70
In Stock
Socomec 8A F Cartridge Fuse, 10 x 38mm
  • RS Stock No. 223-2792
  • Mfr. Part No. 60130008
Each (In a Pack of 10)
HK$14.07
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - 219 3 Pole 480V ac Voltage Rating Panel Mount, 30A Current Rating
  • RS Stock No. 275-0071
  • Mfr. Part No. 219-3-1-66-5-8-30
Each
HK$2,126.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 250A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 260-655
  • Mfr. Part No. 3VA6325-8KM41-0AA0
Each
HK$42,180.70
In Stock
Better World
Siemens SENTRON 5SY5 MCB, 2P, 40A Curve C, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-6012
  • Mfr. Part No. 5SY5240-7
Each
HK$1,890.60
In Stock
ABB RCBO, 32A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type C, System Pro M Compact Range
  • RS Stock No. 201-6975
  • Mfr. Part No. 2CSR255080R3324 DS201 C32 AC300
Each
HK$994.20
Temporarily out of stock
Better World
ABB System Pro M Compact S200 MCB, 4P, 6A Curve K
  • RS Stock No. 225-6005
  • Mfr. Part No. 2CDS254001R0377 S204 K 6A - 10 KA
Each
HK$1,474.69
Temporarily out of stock
Eaton 3A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 169-9370
  • Mfr. Part No. TDC11-3A
1 Bag of 1000
HK$19,715.19
In Stock
Schurter 800mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 777-7508
  • Mfr. Part No. 0034.1515
Each (In a Pack of 10)
HK$2.77
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