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

2302 of 999+
Temporarily out of stock
ABB SMISSLINE TP MCB, 2P, 63A Curve B, 400V AC
  • RS Stock No. 246-2601
  • Mfr. Part No. 2CCS572001R0635
Each
HK$1,497.01
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 6.3kA Ekip Dip LSI, 3 channels
  • RS Stock No. 259-4453
  • Mfr. Part No. 1SDA072653R1
Each
HK$504,189.99
Temporarily out of stock
ABB F200 RCCB, 80A, 4 Pole, 300mA, Type B, 400V ac
  • RS Stock No. 176-9627
  • Mfr. Part No. F204B-80/0.3
Each
HK$22,824.24
Temporarily out of stock
ABB System Pro M Compact S200M MCB, 4P, 16A Curve K, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 202-979
  • Mfr. Part No. 2CDS274001R0467
Each
HK$3,939.32
Temporarily out of stock
Schneider Electric, Canalis Series
  • RS Stock No. 341-478
  • Mfr. Part No. KSA400ET4AF70
Each
HK$14,754.82
In Stock
Rittal Earthing Kit
  • RS Stock No. 230-5203
  • Mfr. Part No. 5302027
Each
HK$431.30
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 500A, Fixed Mount
  • RS Stock No. 260-8207
  • Mfr. Part No. C63F4TM500D
Each
HK$34,651.90
Temporarily out of stock
Siemens 8US1 Busbar for use with Flat Bars
  • RS Stock No. 266-9620
  • Mfr. Part No. 8US1923-5CA02
Each (In a Pack of 10)
HK$134.92
Temporarily out of stock
Better World
Eaton 450A Tag Fuse, 201 x 74 x 74mm, 1.5kV, 170mm
  • RS Stock No. 282-6249
  • Mfr. Part No. PV-450A-3L-BU-15
Each
HK$4,582.75
Temporarily out of stock
Better World
Eaton 125A Tag Fuse, 205 x 78 x 89mm, 1.5kV, 167mm
  • RS Stock No. 282-6217
  • Mfr. Part No. PV-125A-2XL-3BU-15
Each
HK$4,125.15
Currently unavailable
Schneider Electric EasyPact Electronic Circuit Breaker 16A, Plug In
  • RS Stock No. 122-336
  • Mfr. Part No. LV510300P
Each
HK$1,100.97
Temporarily out of stock
FUSE 250V IEC TD HBC 5X20 ROHS 3.15A
  • RS Stock No. 552-250
  • Mfr. Part No. 02153.15TXP
1 Pack of 100
HK$361.14
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 6.3kA Ekip G Hi-Touch LSIG, 3 channels
  • RS Stock No. 259-3387
  • Mfr. Part No. 1SDA071310R1
Each
HK$515,790.09
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 400A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-829
  • Mfr. Part No. 3VA6440-5KT31-2AA0
Each
HK$42,020.60
Temporarily out of stock
Siemens ALPHA Assembly Kit for use with Switch Disconnector
  • RS Stock No. 629-224
  • Mfr. Part No. 8GK4721-2KK10
Each
HK$952.56
Temporarily out of stock
Siemens, SENTRON MCCB 3P 150A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-393
  • Mfr. Part No. 3VA5215-1MH31-0AA0
Each
HK$7,422.80
Temporarily out of stock
Lovato Add-on blocks Mounting Kit for use with GL Series Switch Disconnectors
  • RS Stock No. 248-5568
  • Mfr. Part No. GLX505
Each
HK$1,022.64
In Stock
Siemens Single Phase Industrial Surge Protection, 16A, 230V (Volts), DIN Rail Mount
  • RS Stock No. 266-9589
  • Mfr. Part No. 5SY1716-2
Each
HK$323.10
Temporarily out of stock
Mersen 125mA Quick Acting Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 630-854
  • Mfr. Part No. B090506Q
1 Box of 10
HK$90.82
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 3 channels
  • RS Stock No. 155-916
  • Mfr. Part No. 3VA2440-5MQ32-0AA0
Each
HK$28,173.30
1
2302
2364
Results per page

Related links