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

2305 of 999+
In Stock
Mersen 6A Slotted Tag Fuse, A1, 250 V dc, 550V ac, 44.5mm
  • RS Stock No. 178-0994
  • Mfr. Part No. G1006578 / BNIT55V6
Each (In a Pack of 10)
HK$19.805
Last RS stock
Phoenix Contact 3 Phase Surge Protector, 16A, 360V ac/dc
  • RS Stock No. 254-4817
  • Mfr. Part No. 2882200
Each
HK$473.40
Temporarily out of stock
Hager NFN MCB, 4P, 25A Curve C, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4724
  • Mfr. Part No. NFN425
Each
HK$1,942.94
Temporarily out of stock
Schneider Electric Resi9 Resi9 XE MCB, 1P, 10A, 250V AC
  • RS Stock No. 357-824
  • Mfr. Part No. R9ECL610
Each
HK$979.27
In Stock
Littelfuse 6.3A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 787-4296
  • Mfr. Part No. 35616300029
Each (In a Pack of 5)
HK$13.48
Temporarily out of stock
Siemens, SENTRON MCCB 3P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-692
  • Mfr. Part No. 3VA6560-5KQ36-2AA0
Each
HK$50,307.50
In Stock
Better World
Schneider Electric Spreader for use with Compact Nsx 400/630, Easypact Cvs 400/630
  • RS Stock No. 221-1233
  • Mfr. Part No. LV432490
Each
HK$773.60
In Stock
Better World
Siemens SENTRON 5SL4 MCB, 3P, 16A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 202-7153
  • Mfr. Part No. 5SL4316-7
Each
HK$768.20
Temporarily out of stock
Better World
Schneider Electric Busbar Trunking Riser Fixing, Canalis KS Series
  • RS Stock No. 211-0490
  • Mfr. Part No. KSB1000ZV1
Each
HK$10,102.70
Temporarily out of stock
Eaton xE?ect - FRCdM RCCB, 63A, 4 Pole, 300mA, 240/415V ac
  • RS Stock No. 121-212
  • Mfr. Part No. 167886 FRCDM-63/4/03-G/B+
Each
HK$11,523.70
Temporarily out of stock
Bourns 30A Tag Fuse, 38mm, 500V ac, 24.1mm
  • RS Stock No. 254-4191
  • Mfr. Part No. PF-JT3-30
Each (In a Box of 80)
HK$154.109
Temporarily out of stock
ABB RCBO, 63A Current Rating, 2P Poles, Type K
  • RS Stock No. 237-5058
  • Mfr. Part No. 2CSR252101R1637
Each
HK$4,056.97
Temporarily out of stock
Bourns 3.5A Resettable Fuse, 30V
  • RS Stock No. 817-1719P
  • Mfr. Part No. MF-S350
Each (Supplied in a Bag)
HK$4.03
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 4P 320A, Fixed Mount
  • RS Stock No. 250-4091
  • Mfr. Part No. 1SDA054360R1
Each
HK$41,273.98
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 150A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-093
  • Mfr. Part No. 3VA6115-8KL31-0AA0
Each
HK$23,354.10
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IULNK1 Single Pole Panel Mount, 100A Current Rating
  • RS Stock No. 275-0330
  • Mfr. Part No. IULNK1-1-53-100.
Each
HK$873.10
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 100A, Fixed Mount
  • RS Stock No. 260-8019
  • Mfr. Part No. C25V45E100
Each
HK$41,579.63
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 100A, Fixed Mount
  • RS Stock No. 260-7945
  • Mfr. Part No. C25N42D100
Each
HK$17,821.25
Currently unavailable
SIBA 20A D02 Neozed Fuse, E18 Thread Size, gR, 440V ac
  • RS Stock No. 421-407
  • Mfr. Part No. 10-028-07/20A
Each (In a Pack of 5)
HK$69.66
In Stock
Schneider Electric Straight Busbar Trunking, 3m, 160A, Canalis Series
  • RS Stock No. 130-450
  • Mfr. Part No. KSA160ED43012
Each
HK$10,464.95
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