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

196 of 999+
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 239-843
  • Mfr. Part No. 191678 NZMH2-VX100
Each
HK$11,505.50
Temporarily out of stock
Siemens, SENTRON MCCB 3P 70A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-524
  • Mfr. Part No. 3VA5170-1MU31-0AA0
Each
HK$4,982.10
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 630A, Breaking Capacity 9 kA, Withdrawable
  • RS Stock No. 240-912
  • Mfr. Part No. 191384 NZMH3-4-VX630-T-AVE
Each
HK$53,798.50
Temporarily out of stock
Siemens, SENTRON MCCB 4P 300A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 256-617
  • Mfr. Part No. 3VA5330-5GC41-0AA0
Each
HK$20,441.10
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 20A, Breaking Capacity 7 kA
  • RS Stock No. 159-520
  • Mfr. Part No. 3VA1120-4EE36-0AA0
Each
HK$3,539.70
Temporarily out of stock
Siemens, SENTRON MCCB 3P 250A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 256-599
  • Mfr. Part No. 3VA5325-5EC31-1AA0
Each
HK$14,087.80
Temporarily out of stock
Eaton 250A NH Fuse, 63 x 40 x 135mm, 400V ac
  • RS Stock No. 254-760
  • Mfr. Part No. 250NHG1B-400
1 Pack of 3
HK$324.50
Temporarily out of stock
20A NH Fuse, NH0, 500V
  • RS Stock No. 252-915
  • Mfr. Part No. 20NHG0B
1 Pack of 3
HK$243.20
Temporarily out of stock
Eaton 160A NH Fuse, 63 x 40 x 150mm, 400V ac
  • RS Stock No. 240-195
  • Mfr. Part No. 160NHG02BI-400
1 Pack of 3
HK$407.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 260-610
  • Mfr. Part No. 3VA6325-5KP31-2AA0
Each
HK$35,265.50
Temporarily out of stock
Siemens, SENTRON MCCB 3P 175A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-999
  • Mfr. Part No. 3VA5217-5ED31-2AA0
Each
HK$13,677.40
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 25A, Breaking Capacity 7 kA
  • RS Stock No. 159-513
  • Mfr. Part No. 3VA1125-3EF36-0AA0
Each
HK$3,535.70
Temporarily out of stock
Better World
Siemens Sentron 5SY4 MCB, 4P, 20A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3148
  • Mfr. Part No. 5SY4420-7
Each
HK$1,376.90
Temporarily out of stock
Siemens, SENTRON MCCB 3P 200A, Breaking Capacity 18 kA, Fixed Mount
  • RS Stock No. 147-503
  • Mfr. Part No. 3VA5220-5ED31-1AA0
Each
HK$12,848.40
In Stock
Eaton 100A Centred Tag Fuse, NH1, 690V
  • RS Stock No. 182-1814
  • Mfr. Part No. 170M3812D
Each
HK$3,151.80
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-462
  • Mfr. Part No. 3VA5110-4EF31-0AA0
Each
HK$5,481.30
Temporarily out of stock
Siemens, SENTRON MCCB 4P 225A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-802
  • Mfr. Part No. 3VA5222-5GD41-0AA0
Each
HK$17,303.90
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-689
  • Mfr. Part No. 3VA6140-6KT31-0AA0
Each
HK$20,965.90
Temporarily out of stock
Schurter 6.3A PCB Mount Fuse Holder for 5 x 20mm Fuse, 250V ac
  • RS Stock No. 866-4747
  • Mfr. Part No. 0031.3753
Each (In a Pack of 100)
HK$35.276
Temporarily out of stock
Better World
Schneider Electric Acti 9 iC60H MCB, 4P, 25A Curve C, 440V AC, 220 → 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3433
  • Mfr. Part No. A9F54425
Each
HK$1,356.00
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