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

2304 of 999+
Temporarily out of stock
Eaton, Eaton Moeller Series NZM MCCB Molded Case Circuit Breaker 3P 300A, Breaking Capacity 3 kA, Fixed Mount
  • RS Stock No. 231-186
  • Mfr. Part No. 107589 NZMH2-4-A300/200
Each
HK$23,837.69
In Stock
Eaton 5A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1133
  • Mfr. Part No. S500-5-R
Each (In a Pack of 10)
HK$3.21
Temporarily out of stock
Schneider Electric Cross Elbow Busbar Trunking, 290 → 1200mm, 630A, Canalis Series
  • RS Stock No. 335-029
  • Mfr. Part No. KSA630DLR42F
Each
HK$27,565.00
Temporarily out of stock
ABB S301 MCB, 1P, 1.6A Curve C, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 204-459
  • Mfr. Part No. 2CDS381001R0974
Each
HK$913.42
Temporarily out of stock
Siemens Alpha Assembly Kit for use with Fuse Switch Disconnector
  • RS Stock No. 209-7092
  • Mfr. Part No. 8GK4652-2KK12
Each
HK$629.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-3727
  • Mfr. Part No. 3VA2040-5HM42-0AA0
Each
HK$20,465.10
Temporarily out of stock
Weidmuller 1+N Phase Surge Protector, 40kA, DIN Rail Mount
  • RS Stock No. 249-3337
  • Mfr. Part No. 1352620000
Each
HK$3,113.25
In Stock
RS PRO SMD Non-Resettable Surface Mount Fuse 2A, 63V
  • RS Stock No. 252-2129
Each (In a Pack of 50)
HK$1.389
In Stock
Better World
Schneider Electric Multi 9 C60SP MCB, 3P, 32A Curve C, 440V AC, 15 kA Breaking Capacity
  • RS Stock No. 211-2376
  • Mfr. Part No. M9F22332
Each
HK$560.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3796
  • Mfr. Part No. 3VA2216-5KP32-0AA0
Each
HK$17,896.90
New product - Preorder today
FUSE 250V IEC TD LBC 5X20 1.6A
  • RS Stock No. 565-500
  • Mfr. Part No. 021801.6TXP
Each
HK$437.77
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 630A, Breaking Capacity 30 kA, Fixed Mount
  • RS Stock No. 341-261
  • Mfr. Part No. C063H45EFM
Each
HK$106,126.29
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 3P, 13A Curve B, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 204-481
  • Mfr. Part No. 2CDS383001R0135
Each
HK$3,168.43
Temporarily out of stock
ABB Copper Copper Bar for Use with TriLine
  • RS Stock No. 237-6609
  • Mfr. Part No. 2CPX061428R9999
1 Box of 1
HK$11,619.84
Temporarily out of stock
HENSEL ENYSTAR Distribution Board, 8 Way, 63 A
  • RS Stock No. 117-200
  • Mfr. Part No. FP VN 0801 GB
Each
HK$12,391.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 260-355
  • Mfr. Part No. 3VA6340-8JP31-0AA0
Each
HK$35,658.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3988
  • Mfr. Part No. 3VA2110-7JP32-0AA0
Each
HK$14,458.90
In Stock
Eaton xEffect MCB, 1P, 3.5A Curve C
  • RS Stock No. 230-0966
  • Mfr. Part No. 177387 FAZ6-C3,5/1
Each
HK$228.24
In Stock
Legrand DNX3 Circuit Breaker, 1+N, 6A Curve C, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 266-1315
  • Mfr. Part No. 406879
Each
HK$431.33
In Stock
Mersen 6A Slotted Tag Fuse, A1, 250 V dc, 550V ac, 44.5mm
  • RS Stock No. 178-0994
  • Mfr. Part No. G1006578 / BNIT55V6
Each (In a Pack of 10)
HK$19.805
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