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

240 of 999+
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 4P, 20A Curve C, 400V AC, 60V DC, 30 kA Breaking Capacity
  • RS Stock No. 610-620
  • Mfr. Part No. 5SY8420-7
Each
HK$2,291.81
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.25kA 1SDA07, 3 channels
  • RS Stock No. 259-4079
  • Mfr. Part No. 1SDA072172R1
Each
HK$33,973.54
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 3P 10A, Fixed Mount
  • RS Stock No. 236-6520
  • Mfr. Part No. 1SDA067981R1 XT2V 160 Ekip LSI 10A FF
Each
HK$14,334.30
Last RS stock
Phoenix Contact Thermal Circuit Breaker - TCP 20/DC32V Single Pole 32V dc Voltage Rating On Base Element, 20A Current
  • RS Stock No. 652-3414
  • Mfr. Part No. 0700020
Each (In a Pack of 5)
HK$104.12
In Stock
RS PRO 25A F Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 247-3999
Each (In a Pack of 10)
HK$8.15
Temporarily out of stock
Phoenix Contact Thermomagnetic Device Circuit Breaker Thermal Circuit Breaker - CB Single Pole 50V dc Voltage Rating,
  • RS Stock No. 212-8791
  • Mfr. Part No. 2800863
Each
HK$372.40
Temporarily out of stock
Siemens ALPHA Assembly Kit for use with Modular Installation Devices
  • RS Stock No. 629-211
  • Mfr. Part No. 8GK4351-4KK21
Each
HK$1,556.16
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 268-387
  • Mfr. Part No. 3VA6110-8KP31-0AA0
Each
HK$18,917.60
Temporarily out of stock
Better World
Schneider Electric iC60 RCD, 63A
  • RS Stock No. 776-2907
  • Mfr. Part No. A9V39363
Each
HK$8,336.29
In Stock
Phoenix Contact Electronic Device Circuit Breaker Electronic Circuit breaker 8A 24V PTCB, 1 channels , DIN Rail Mount
  • RS Stock No. 207-2796
  • Mfr. Part No. 2908262
Each
HK$387.40
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IULNK1 Single Pole Panel Mount, 5A Current Rating
  • RS Stock No. 275-0334
  • Mfr. Part No. IULNK1-1REC4-52-5.00
1 Box of 5
HK$4,053.40
Temporarily out of stock
Better World
ABB, XT4H MCCB 3P 52A, Fixed Mount
  • RS Stock No. 236-6753
  • Mfr. Part No. 1SDA068448R1 XT4H 160 MA 125 FF
Each
HK$6,404.50
Temporarily out of stock
Better World
ABB, XT2H MCCB 3P 10A, Fixed Mount
  • RS Stock No. 236-7528
  • Mfr. Part No. 1SDA067857R1 XT2H 160 Ekip LS/I 10A FF
Each
HK$5,464.68
Temporarily out of stock
Siemens SENTRON 5SJ4113 MCB, 1P, 13A Curve D, 400V AC, 60V DC, 14 kA Breaking Capacity
  • RS Stock No. 299-725
  • Mfr. Part No. 5SJ4113-8HG40
Each
HK$384.10
Temporarily out of stock
Siemens, SENTRON MCCB 4P 175A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 148-012
  • Mfr. Part No. 3VA5217-7EC41-0AA0
Each
HK$12,866.20
Temporarily out of stock
ABB System Pro M Compact S200 M UC MCB, 4P, 50A Curve C, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 201-103
  • Mfr. Part No. 2CDS274061R0504
Each
HK$7,325.25
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 4P 20A, Fixed Mount
  • RS Stock No. 236-6587
  • Mfr. Part No. 1SDA068094R1 XT4N 160 TMD 20A FF
Each
HK$6,300.50
Temporarily out of stock
Siemens SIRIUS Auxiliary Contact for use with 3RV2
  • RS Stock No. 159-422
  • Mfr. Part No. 3RV2901-2B
Each
HK$88.30
In Stock
Eaton 250A Rail Mount Fuse Holder for NH1 Fuse, 3P, 690V ac
  • RS Stock No. 182-1506
  • Mfr. Part No. TD1-D
Each
HK$2,120.40
In Stock
Eaton xEffect MCB, 1P, 2A Curve D
  • RS Stock No. 230-1021
  • Mfr. Part No. 177484 FAZ6-D2/1
Each
HK$324.50
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