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

2339 of 999+
ABB SU200 M MCB, 3P, 8A Curve K, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 200-201
  • Mfr. Part No. 2CDS273337R0407
Each
HK$3,259.77
Littelfuse Fuse Holder DIN Rail Adapter
  • RS Stock No. 360-5670
  • Mfr. Part No. FBDIN1
Each (In a Pack of 5)
HK$29.08
Better World
Siemens, SENTRON MCCB 3P 400A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 249-301
  • Mfr. Part No. 3VA6440-6JT31-2AA0
Each
HK$33,340.80
Mersen 20A T Fibreglass Cartridge Fuse, 10 x 38mm
  • RS Stock No. 914-4376
  • Mfr. Part No. ATQR20
Each
HK$100.80
Mersen 45A British Standard Fuse, 17 x 49mm, 690V, 61 → 65.5mm
  • RS Stock No. 238-4007
  • Mfr. Part No. D220964
Each
HK$429.20
Siemens SENTRON 5SY8 MCB, 4P, 20A Curve C, 400V AC, 60V DC, 30 kA Breaking Capacity
  • RS Stock No. 610-288
  • Mfr. Part No. 5SY8620-7
Each
HK$2,093.75
Eaton 250A Tag Fuse, NH2, 1kV
  • RS Stock No. 282-6184
  • Mfr. Part No. BSF-250G-NH210
Each
HK$2,377.40
Eaton RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type A, Type B, FRBdM Range
  • RS Stock No. 120-974
  • Mfr. Part No. 168198 FRBDM-B10/2/003-G/A
Each
HK$1,712.66
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 3P 125A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 232-0262
  • Mfr. Part No. 1SDA067559R1 XT2S 160 TMA 125A FF
Each
HK$3,496.70
TE Connectivity Thermal Circuit Breaker - W58 Single Pole 50 V dc, 250V ac Voltage Rating, 20A Current Rating
  • RS Stock No. 782-7981
  • Mfr. Part No. W58-XC4C12A-20
Each
HK$63.90
Littelfuse SMD Non Resettable Fuse 1.5A, 125V
  • RS Stock No. 738-2876
  • Mfr. Part No. 015401.5DRT
Each (In a Pack of 10)
HK$20.41
ABB Tmax Plug In Unit for use with T4
  • RS Stock No. 237-5975
  • Mfr. Part No. 1SDA054737R1 T4 PFP-EF
Each
HK$2,099.30
Eaton 110 V dc, 250V ac Auxiliary Release Shunt trip for use with FAZ Series MCB/RCBO
  • RS Stock No. 922-6958
  • Mfr. Part No. 262414 FAZ-XAM002
Each
HK$398.50
ITT Cannon Fuse Carrier L2, 078214-9021
  • RS Stock No. 696-8882
  • Mfr. Part No. 078214-9021
Each
HK$5,779.60
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3681
  • Mfr. Part No. 3VA2025-7JQ32-0AA0
Each
HK$31,368.80
RS PRO PC Board Non Resettable Fuse 6.3A, 250V ac
  • RS Stock No. 911-3568
Each (In a Pack of 10)
HK$0.84
TE Connectivity Thermal Circuit Breaker - W31 Single Pole 50 V dc, 240V ac Voltage Rating, 40A Current Rating
  • RS Stock No. 782-8094
  • Mfr. Part No. W31-X2M1G-40
Each
HK$426.00
Siemens SENTRON Switch Disconnector
  • RS Stock No. 277-0762
  • Mfr. Part No. 3WA9111-0AH24
1 Set
HK$3,589.90
Schurter OGN Series PCB Mount Fuse Holder Cover for 5 x 20mm Fuse, IP00
  • RS Stock No. 176-9069
  • Mfr. Part No. 0853.0551
Each (In a Pack of 10)
HK$5.25
Eaton xPole PXL, S200 MCB, 1P, 6A Curve B, 400V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 486-952
  • Mfr. Part No. 236027 PXL-B6/1
Each
HK$121.50
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