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

2230 of 999+
Temporarily out of stock
ABB S302 MCB, 2P, 63A Curve K, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-925
  • Mfr. Part No. 2CDS382001R0607
Each
HK$3,187.46
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IELHK111 3 Pole Panel Mount, 70A Current Rating
  • RS Stock No. 275-0247
  • Mfr. Part No. IELHK111-1-62F-70.0-ABK-01-V
Each
HK$2,503.80
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 4P, 4A Curve D, 400V AC, 60V DC, 50 kA Breaking Capacity
  • RS Stock No. 610-410
  • Mfr. Part No. 5SY8604-8
Each
HK$2,791.66
Temporarily out of stock
xEnergy Basic Distribution Board Enclosure
  • RS Stock No. 252-730
  • Mfr. Part No. 193178 BP-O-850/14-EP-W
Each
HK$7,217.34
Temporarily out of stock
Eaton NZM Handle for use with N(S)1(-4), NZM1(-4), PN1(-4)
  • RS Stock No. 121-802
  • Mfr. Part No. 144907 NZM1-XHB-DAR-V6
Each
HK$3,244.55
In Stock
Littelfuse SMD Non Resettable Fuse 3A, 125V ac/dc
  • RS Stock No. 219-6248
  • Mfr. Part No. 0154003.DRT
Each (In a Pack of 10)
HK$17.79
Temporarily out of stock
Better World
Siemens RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 225-8737
  • Mfr. Part No. 5SU1324-6FA10
Each
HK$1,475.30
Temporarily out of stock
Eaton 355A Tag Fuse, 76 x 442mm, 7.2kV
  • RS Stock No. 229-161
  • Mfr. Part No. 7.2WKMSJ355 7.2KV 355A 3" MOTORSTART FUSE
Each
HK$17,480.70
In Stock
TE Connectivity Thermal Circuit Breaker - W23 Single Pole 50 V dc, 250V ac Voltage Rating, 2A Current Rating
  • RS Stock No. 782-7944
  • Mfr. Part No. W23-X1A1G-2
Each
HK$585.20
Temporarily out of stock
Siemens, SENTRON MCCB 2P 225A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-791
  • Mfr. Part No. 3VA5222-5EC61-0AA0
Each
HK$11,812.20
Temporarily out of stock
RS PRO SMD Non Resettable Fuse 2.5A, 125V
  • RS Stock No. 182-4112
Each (In a Pack of 25)
HK$2.315
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 160A 3VA2, 3 channels
  • RS Stock No. 156-647
  • Mfr. Part No. 3VA2216-5JQ32-0AA0
Each
HK$21,408.30
Temporarily out of stock
Better World
ABB System Pro M Compact S200 MCB, 2P, 20A Curve K, 400V AC, 125V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-8009
  • Mfr. Part No. 2CDS252001R0487 S202-K20
Each
HK$614.60
Temporarily out of stock
Schneider Electric IKQ RCD, 40A, 2 Pole, 100mA, 230V ac
  • RS Stock No. 335-408
  • Mfr. Part No. SED40102
Each
HK$1,703.49
In Stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 3A Curve C, 400V AC, 110V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-7744
  • Mfr. Part No. 2CDS253001R0034 S203-C3
Each
HK$632.90
In Stock
Littelfuse 500mA T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-4230
  • Mfr. Part No. 0218.500MXP
Each (In a Pack of 10)
HK$6.19
Temporarily out of stock
Siemens SIVACON S4 Busbar
  • RS Stock No. 627-393
  • Mfr. Part No. 8PQ6000-6BA76
Each
HK$3,810.25
Temporarily out of stock
Eaton xEffect MCB, 4P, 12A Curve D
  • RS Stock No. 230-1013
  • Mfr. Part No. 177610 FAZ6-D12/4
Each
HK$1,025.53
In Stock
Better World
Schneider Electric 12A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 219-9055
  • Mfr. Part No. DF2CN12
Each (In a Pack of 10)
HK$102.808
Temporarily out of stock
Eaton 32A Tag Fuse, 415V ac
  • RS Stock No. 229-143
  • Mfr. Part No. NITD32M50
1 Pack of 20
HK$4,690.30
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