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

214 of 999+
Temporarily out of stock
Schneider Electric, PowerPact MCCB 3P 400A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 432-922
  • Mfr. Part No. NLLF36400U53XTW
Each
HK$140,424.39
In Stock
Better World
Siemens 3VA911 RCD, 160A, 4 Pole, Type A
  • RS Stock No. 210-9290
  • Mfr. Part No. 3VA9114-0RL20
Each
HK$13,768.20
Temporarily out of stock
Better World
Siemens 3VA9 RCD, 160A, 4 Pole, Type A
  • RS Stock No. 210-3514
  • Mfr. Part No. 3VA9114-0RS10
Each
HK$7,746.40
Temporarily out of stock
ABB RCBO, 16A Current Rating, 2P Poles, 100mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6896
  • Mfr. Part No. 2CSR255180R2164
Each
HK$1,471.25
In Stock
ABB 110 → 250V ac/dc Shunt Trip Shunt trip for use with S800PV, S800S, S800N, S800C, S800B, S800HV, S800U Series
  • RS Stock No. 435-548
  • Mfr. Part No. 2CCS800900R0211 S800-SOR250
Each
HK$811.10
In Stock
Wickmann 0.3A Resettable Fuse, 30V dc
  • RS Stock No. 174-0819
  • Mfr. Part No. RF1907-000
Each (In a Pack of 20)
HK$3.315
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IUGN66 2 Pole Panel Mount, 10A Current Rating
  • RS Stock No. 275-0288
  • Mfr. Part No. IUGN66-1-61-10.0
1 Box of 5
HK$5,220.80
In Stock
ABB S201L MCB, 1P, 32A Curve C, 230/400V AC, 6 kA Breaking Capacity
  • RS Stock No. 203-771
  • Mfr. Part No. 2CDS241701R0324
Each
HK$377.36
Temporarily out of stock
ABB System Pro M Compact S200M MCB, 1+N, 13A Curve D, 230V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 201-135
  • Mfr. Part No. 2CDS271103R0131
Each
HK$1,137.40
Temporarily out of stock
Littelfuse 125mA F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 738-3185
  • Mfr. Part No. 0KLK.125T
Each
HK$286.50
In Stock
Schurter 30A Rail Mount Fuse Holder for 10 x 38mm Fuse, 2P, 600V ac
  • RS Stock No. 712-4796
  • Mfr. Part No. 0091.0002
Each
HK$244.00
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 3 kA
  • RS Stock No. 245-662
  • Mfr. Part No. 3VA6225-6HM31-0AA0
Each
HK$23,396.80
Temporarily out of stock
ABB SU200 M MCB, 1P, 13A Curve K, 277V AC, 48V DC, 15 kA Breaking Capacity
  • RS Stock No. 202-882
  • Mfr. Part No. 2CDS271337R0447
Each
HK$801.05
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 1.25kA, Breaking Capacity 42 kA, Fixed Mount
  • RS Stock No. 429-172
  • Mfr. Part No. C125H42EFM
Each
HK$143,040.58
Temporarily out of stock
ABB S301 MCB, 1P, 25A Curve D, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-271
  • Mfr. Part No. 2CDS381001R0251
Each
HK$875.36
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 1+N, 1A Curve D, 240V AC, 72V DC, 100 kA Breaking Capacity
  • RS Stock No. 204-461
  • Mfr. Part No. 2CDS381103R0011
Each
HK$2,102.77
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 150A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 268-527
  • Mfr. Part No. 3VA6115-5HN31-0AA0
Each
HK$11,718.90
Temporarily out of stock
ABB SU200 M MCB, 2P, 25A, Type Z, 440V AC, 96V DC, 15 kA Breaking Capacity
  • RS Stock No. 201-044
  • Mfr. Part No. 2CDS272337R0518
Each
HK$2,481.65
Temporarily out of stock
ABB S303 MCB, 3P, 40A Curve D, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 201-350
  • Mfr. Part No. 2CDS383001R0401
Each
HK$3,758.35
Temporarily out of stock
Siemens, SENTRON MCCB 2P 150A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-975
  • Mfr. Part No. 3VA5215-7ED61-0AA0
Each
HK$8,412.50
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