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

168 of 999+
Temporarily out of stock
Eaton 160A Fuse Holder for NH00, NH000 Fuse, 3P, 440 V ac/dc, 690 V ac/dc
  • RS Stock No. 127-218
  • Mfr. Part No. 183028 XNH00-FCL-A160-BT
Each
HK$1,113.23
Being discontinued
RS PRO 2.5A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 563-627
Each (In a Pack of 10)
HK$2.28
In Stock
Eaton 6A DII Diazed Fuse, gG, 500V ac
  • RS Stock No. 181-8534
  • Mfr. Part No. 6D27
1 Box of 25
HK$3,663.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 20A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9813
  • Mfr. Part No. 3VA1120-3GD42-0AA0
Each
HK$3,645.50
Temporarily out of stock
Siemens 250A Tag Fuse, NH3mm, 2kV, 210mm
  • RS Stock No. 627-001
  • Mfr. Part No. 3NE7427-0U
1 Pack of 2
HK$6,340.10
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 630A, Breaking Capacity 9 kA, Withdrawable
  • RS Stock No. 246-888
  • Mfr. Part No. 192276 NZMH3-PX630-TAZ-AVE
Each
HK$68,149.30
Temporarily out of stock
Eaton 35A NH Fuse, 58 x 30 x 135mm, 400V ac
  • RS Stock No. 261-564
  • Mfr. Part No. 35NHG01B-400
1 Pack of 3
HK$288.10
Temporarily out of stock
Siemens, SENTRON MCCB 4P 300A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 257-430
  • Mfr. Part No. 3VA5330-6GF41-0AA0
Each
HK$28,175.50
Temporarily out of stock
Eaton 100A NH Fuse, 63 x 40 x 150mm, 400V ac
  • RS Stock No. 247-090
  • Mfr. Part No. 100NHG02BI-400
1 Pack of 3
HK$407.70
Temporarily out of stock
Siemens, SENTRON MCCB 3P 250A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 256-552
  • Mfr. Part No. 3VA5325-0MH31-0AA0
Each
HK$15,653.10
Temporarily out of stock
Siemens, SENTRON MCCB 4P 225A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 256-546
  • Mfr. Part No. 3VA5322-6EF41-0AA0
Each
HK$23,019.30
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 350A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 243-032
  • Mfr. Part No. 191597 NZMN3-MX350-SVE
Each
HK$24,417.10
Temporarily out of stock
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 147-767
  • Mfr. Part No. 3VA5210-1BB31-0AA0
Each
HK$5,740.40
Temporarily out of stock
Eaton 200A Tag Fuse, 76 x 262mm, 3.6kV
  • RS Stock No. 258-973
  • Mfr. Part No. 3.6WFOH6200
1 Pack of 3
HK$20,952.10
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-510
  • Mfr. Part No. 3VA6140-7HL31-0AA0
Each
HK$9,996.80
Temporarily out of stock
16A Tag Fuse, 440V ac
  • RS Stock No. 263-426
  • Mfr. Part No. XS16
1 Pack of 10
HK$3,018.90
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 450A, Breaking Capacity 5 kA, Withdrawable
  • RS Stock No. 246-908
  • Mfr. Part No. 192336 NZMN3-PMX450-AVE
Each
HK$38,226.30
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 220A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 246-863
  • Mfr. Part No. 191633 NZMN2-MX220
Each
HK$15,098.00
Temporarily out of stock
Schneider Electric Resi9 R9F2 MCB, 3P, 50A Curve B, 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 212-141
  • Mfr. Part No. R9F23350
Each
HK$1,374.89
Temporarily out of stock
50A NH Fuse, 58 x 30 x 135mm, 400V ac
  • RS Stock No. 263-476
  • Mfr. Part No. 50NHG01B-400
1 Pack of 3
HK$288.10
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