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

2272 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 630A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 270-3528
  • Mfr. Part No. 3VA1463-6EF42-0AA0
Each
HK$59,885.70
Temporarily out of stock
Better World
ABB System Pro M Compact S200M MCB, 1P, 13A Curve B
  • RS Stock No. 231-9692
  • Mfr. Part No. 2CDS271001R0135 S201M-B 13
1 Box of 1
HK$195.70
In Stock
Littelfuse 1A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 769-0048
  • Mfr. Part No. 0219001.MXABP
Each (In a Pack of 10)
HK$14.75
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 160A, Breaking Capacity 70 kA, DIN Rail Mount
  • RS Stock No. 271-9799
  • Mfr. Part No. 3VA1116-6FE42-0AA0
Each
HK$10,569.30
Temporarily out of stock
RS PRO PC Board Non Resettable Fuse, Axial 1.25A, 125V ac/dc
  • RS Stock No. 764-9463
Each (In a Pack of 10)
HK$2.155
In Stock
Schneider Electric Motor Mechanism for use with ComPacT NSX New Generation
  • RS Stock No. 130-374
  • Mfr. Part No. LV429435
Each
HK$8,344.29
Temporarily out of stock
ABB System Pro M Compact S200 MCB, 2P, 500mA Curve C, 440V AC, 125V DC, 10 kA Breaking Capacity
  • RS Stock No. 183-3619
  • Mfr. Part No. 2CDS252001R0984
Each
HK$883.24
Temporarily out of stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 50A Current Rating
  • RS Stock No. 175-1482
  • Mfr. Part No. GV4LE50S
Each
HK$4,613.20
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 800A, Breaking Capacity 110 kA, DIN Rail Mount
  • RS Stock No. 272-0194
  • Mfr. Part No. 3VA1580-7GF42-0AA0
Each
HK$48,199.90
Temporarily out of stock
Better World
Siemens SENTRON 5SV3xxx RCCB, 63A, 2 Pole, 300mA, Type A, 230V ac
  • RS Stock No. 241-4446
  • Mfr. Part No. 5SV3616-6KL
Each
HK$1,274.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4049
  • Mfr. Part No. 3VA2116-0HL32-0AA0
Each
HK$15,411.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 400A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3808
  • Mfr. Part No. 3VA2440-5MN32-0AA0
Each
HK$21,287.00
Temporarily out of stock
Siemens, SENTRON MCCB 4P 175A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-490
  • Mfr. Part No. 3VA5217-6EF41-2AA0
Each
HK$13,422.90
In Stock
Better World
Schneider Electric Acti 9 iC60L MCB, 3P, 10A Curve C
  • RS Stock No. 247-1949
  • Mfr. Part No. A9F94310
Each
HK$1,770.70
Temporarily out of stock
Better World
Siemens SENTRON 5SY7 MCB, 4P, 50A Curve C, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8912
  • Mfr. Part No. 5SY7450-7
Each
HK$2,901.30
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-592
  • Mfr. Part No. 3VA6560-7HN32-0AA0
Each
HK$35,910.00
Temporarily out of stock
Better World
Siemens RCBO, 13A Current Rating, 2P Poles, 300mA Trip Sensitivity, Sentron Range
  • RS Stock No. 225-8833
  • Mfr. Part No. 5SV1616-7KK13
Each
HK$919.10
In Stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 3A, Type Z
  • RS Stock No. 237-3242
  • Mfr. Part No. 2CDS253001R0318 S203 Z 3A - 10 KA
Each
HK$1,307.90
Temporarily out of stock
ABB RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6878
  • Mfr. Part No. 2CSR275080R1105
Each
HK$1,609.99
Temporarily out of stock
Eaton 400A Fuse Holder for NH2 Fuse, 3P, 440 V ac/dc, 690 V ac/dc
  • RS Stock No. 127-396
  • Mfr. Part No. 183070 XNH2-FCE-S400-BT
Each
HK$7,706.99
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