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

158 of 999+
In Stock
Better World
Schneider Electric Acti 9 iC60N MCB, 3P, 16A Curve C, 400V AC, 12 → 144V DC, 6 kA Breaking Capacity
  • RS Stock No. 734-9150
  • Mfr. Part No. A9F77316
Each
HK$1,371.10
In Stock
Europa EUC1P EUC MCB, 1P, 1A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6493
  • Mfr. Part No. EUC1P1C
Each
HK$55.20
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 250A, Breaking Capacity 3 kA
  • RS Stock No. 245-659
  • Mfr. Part No. 3VA6225-5KT41-0AA0
Each
HK$34,842.00
Temporarily out of stock
Siemens, SENTRON MCCB 4P 175A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 148-009
  • Mfr. Part No. 3VA5217-5GC41-0AA0
Each
HK$15,024.40
In Stock
Phoenix Contact Electronic Device Circuit Breaker Electronic Circuit breaker 4A 24V CBMC, 1 channels , DIN Rail Mount
  • RS Stock No. 207-2676
  • Mfr. Part No. 1065727
Each
HK$1,061.70
Temporarily out of stock
Schneider Electric 16 Way Metal Consumer Unit, 100A, IP2X, IP3X EZ9E
  • RS Stock No. 654-696
  • Mfr. Part No. EZ9E16MCCU
Each
HK$751.75
Temporarily out of stock
Siemens SENTRON for use with 3VA52, 3VA61/62 Series
  • RS Stock No. 263-647
  • Mfr. Part No. 3VA9277-0CK72
1 Kit
HK$9,247.30
Temporarily out of stock
SENTRON Terminal Cover for use with 3VA55, 3VA65 Series
  • RS Stock No. 263-782
  • Mfr. Part No. 3VA9671-0WD30
Each
HK$1,033.10
Temporarily out of stock
Siemens SENTRON Undervoltage Release
  • RS Stock No. 277-0739
  • Mfr. Part No. 3WA9111-0AE13
Each
HK$7,170.90
Temporarily out of stock
Eaton NZM Circuit Breaker for use with Circuit Breaker
  • RS Stock No. 240-815
  • Mfr. Part No. 192317 NZMS3-4-PX400/VAR-TAZ-AVE
Each
HK$69,052.60
Temporarily out of stock
Eaton Distribution Parts Rigid Wire Jumper for use with Distribution Parts
  • RS Stock No. 252-819
  • Mfr. Part No. 215615 RVS-1PHAS+N/125
1 Pack of 3
HK$131.60
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-398
  • Mfr. Part No. 3VA2125-8HM42-0AA0
Each
HK$15,730.80
Temporarily out of stock
Eaton xEnergy Main Busbar Support for use with Busbar
  • RS Stock No. 247-214
  • Mfr. Part No. 133071 XNNS-30X15
1 Pack of 5
HK$3,575.50
Temporarily out of stock
Siemens SENTRON Cover Frame for use with 3VA55/65/66
  • RS Stock No. 162-029
  • Mfr. Part No. 3VA9583-0SB20
Each
HK$953.20
Temporarily out of stock
Eaton AKP1000 Enclosure for use with Double T Profile, Feeder Circuits
  • RS Stock No. 240-667
  • Mfr. Part No. 107199 AKP1000
1 Pack of 3
HK$2,624.70
Temporarily out of stock
SENTRON Cover Frame for use with 3VA57/58/59, 3VA67/68/69
  • RS Stock No. 263-852
  • Mfr. Part No. 3VA9877-0SB10
Each
HK$684.80
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-393
  • Mfr. Part No. 3VA2125-8HL42-0AA0
Each
HK$12,339.80
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 160A 3VA2, 4 channels
  • RS Stock No. 156-652
  • Mfr. Part No. 3VA2216-5KQ42-0AA0
Each
HK$24,051.10
Temporarily out of stock
Siemens SENTRON Undervoltage Release for use with 3VA1 and 3VA20-26
  • RS Stock No. 157-841
  • Mfr. Part No. 3VA9908-0BB22
Each
HK$1,478.70
Temporarily out of stock
Eaton Plate for use with N4-4, NZM4-4
  • RS Stock No. 257-959
  • Mfr. Part No. 284474 NZM4-4-XKM2S-1600
Each
HK$2,124.20
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