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

46975 Products showing for Fuses & Circuit Breakers

2238 of 999+
In Stock
Better World
Schneider Electric Acti 9 Acti9 iDT40T MCB, 1+N, 32A Curve C, 6 kA Breaking Capacity
  • RS Stock No. 191-6093
  • Mfr. Part No. A9P22632
Each
HK$307.00
In Stock
Legrand 8A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 180-6117
  • Mfr. Part No. 0 133 08
Each (In a Box of 10)
HK$20.33
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 80A, Breaking Capacity 15 kA, Fixed Mount
  • RS Stock No. 231-505
  • Mfr. Part No. 110290 NZMH2-A80-BT
Each
HK$5,533.92
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 260-177
  • Mfr. Part No. 3VA6325-5KL31-0AA0
Each
HK$29,004.30
In Stock
Better World
Siemens 5SV3 RCCB, 40A, 4 Pole, 30mA, Type A
  • RS Stock No. 124-7733
  • Mfr. Part No. 5SV3344-6KL
Each
HK$1,104.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 210-1724
  • Mfr. Part No. 3VA2116-6KP36-0AA0
Each
HK$19,556.70
Temporarily out of stock
Better World
Schneider Electric Acti 9 Acti9 iDT40N MCB, 3P, 20A Curve C, 400V AC
  • RS Stock No. 238-3372
  • Mfr. Part No. A9P24320
Each
HK$1,117.40
In Stock
Eaton 2A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1436
  • Mfr. Part No. S501-2-R
Each (In a Pack of 10)
HK$7.21
In Stock
Schneider Electric Linergy Busbar
  • RS Stock No. 130-977
  • Mfr. Part No. LVS04545
Each
HK$13,068.96
Temporarily out of stock
Eaton Three Phase Surge Protector, 40kA, 1.6kV, DIN Rail Mount
  • RS Stock No. 120-782
  • Mfr. Part No. 167601 SPCT2-335/4
Each
HK$8,334.96
Temporarily out of stock
Better World
Siemens 5sV3 RCCB, 63A, 2 Pole, 100mA, Type A, 230V ac
  • RS Stock No. 211-9664
  • Mfr. Part No. 5SV3416-8
Each
HK$2,715.90
Temporarily out of stock
Eaton 16A NH Fuse, 51 x 21 x 79mm, 400V ac
  • RS Stock No. 244-721
  • Mfr. Part No. 16NHG000BI-400 NH FUSE 16A 400V GG SIZE 000
1 Pack of 3
HK$169.50
Temporarily out of stock
ABB IEC Range Busbar for use with DDA200, F200, S200
  • RS Stock No. 250-4743
  • Mfr. Part No. 2CDL220010R1012
1 Box of 50
HK$6,248.09
Temporarily out of stock
Schneider Electric, Compact MCCB 4P 800A, Fixed Mount
  • RS Stock No. 247-1788
  • Mfr. Part No. 33384
Each
HK$43,278.24
In Stock
Littelfuse 20A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 754-6294
  • Mfr. Part No. 0SPF020
Each
HK$94.60
In Stock
Eaton 10A Bolted Tag Fuse, 240V ac, 35mm
  • RS Stock No. 181-8923
  • Mfr. Part No. STD10
Each
HK$32.60
In Stock
ABB RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6931
  • Mfr. Part No. 2CSR255180R1105
Each
HK$1,599.50
Temporarily out of stock
Eaton Eaton Moeller NZM Residual Current Release for use with Four Pole NZM1-4, N1-4
  • RS Stock No. 248-016
  • Mfr. Part No. 104613 NZM1-4-XFI300U
Each
HK$8,007.90
Temporarily out of stock
ABB 1.25kA Tag Fuse, 200 x 68 x 119mm, 500V
  • RS Stock No. 251-3499
  • Mfr. Part No. 1SCA022627R7830
Each
HK$2,261.15
In Stock
ETA Thermal Magnetic Circuit Breaker - 201 Single Pole, 1A Current Rating
  • RS Stock No. 333-237
  • Mfr. Part No. 201-1A
Each
HK$298.00
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