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

2311 of 999+
Temporarily out of stock
Bourns Thermal Fuse +77°C 50 A, 28V
  • RS Stock No. 258-6404
  • Mfr. Part No. SC77AAA
Each (In a Bag of 5000)
HK$5.336
Temporarily out of stock
ABB Copper Copper Bar for Use with TriLine
  • RS Stock No. 237-6596
  • Mfr. Part No. 2CPX061359R9999
1 Box of 1
HK$13,220.96
Temporarily out of stock
Better World
Siemens 5SV3 RCCB, 40A, 4 Pole, 300mA, Type F, 400V ac
  • RS Stock No. 211-9698
  • Mfr. Part No. 5SV3644-7
Each
HK$1,787.50
Temporarily out of stock
Eaton xEffect MCB, 3+N, 2.5A Curve D
  • RS Stock No. 230-1020
  • Mfr. Part No. 177474 FAZ6-D2,5/3N
Each
HK$1,417.79
Temporarily out of stock
BB-EV 2 Phase Busbar, 690V, 27mm Pitch
  • RS Stock No. 247-374
  • Mfr. Part No. 168858 BB-EVP-10/N-1,5MU
Each
HK$385.30
Temporarily out of stock
ABB System Pro M Compact SU200 MR Circuit Breaker, 1P, 63A Curve K, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 204-335
  • Mfr. Part No. 2CDS271347R0607
Each
HK$2,054.63
Temporarily out of stock
ABB S800U MCB, 1P, 30A, Type Z, 240V AC, 30 kA Breaking Capacity
  • RS Stock No. 140-438
  • Mfr. Part No. 2CCS881017R0305
Each
HK$2,143.30
Temporarily out of stock
Siemens SENTRON 5SJ MCB, 1P, 15A
  • RS Stock No. 232-2236
  • Mfr. Part No. 5SJ4118-8HG40
Each
HK$418.30
In Stock
Eaton 7A T Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 848-4178
  • Mfr. Part No. LP-CC-7
Each
HK$554.70
In Stock
Eaton xEffect MCB, 2P, 40A Curve C
  • RS Stock No. 230-0979
  • Mfr. Part No. 239107 FAZ6-C40/2
Each
HK$544.60
Temporarily out of stock
ABB System Pro M Compact SU200 MR Circuit Breaker, 1P, 32A Curve K, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 200-145
  • Mfr. Part No. 2CDS271347R0537
Each
HK$1,317.32
Temporarily out of stock
Schneider Electric, PowerPact MCCB 2P 15A, Breaking Capacity 65 kA, Clip-On
  • RS Stock No. 346-805
  • Mfr. Part No. BJF26015
Each
HK$8,005.30
Temporarily out of stock
RND 630mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 697-247
  • Mfr. Part No. RND 170-00060
1 Pack of 25
HK$16.21
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 2P, 8A Curve B, 415V AC, 125V DC, 25 kA Breaking Capacity
  • RS Stock No. 200-744
  • Mfr. Part No. 2CDS382001R0085
Each
HK$2,055.20
Temporarily out of stock
Eaton NZM Jumper Link for use with N2-4-…-S1(-S15)-DC
  • RS Stock No. 121-180
  • Mfr. Part No. 170118 NZM2-4-XKVI2POU
Each
HK$1,332.07
Temporarily out of stock
ABB RCBO, 50A Current Rating, 4P Poles, Type B
  • RS Stock No. 237-5127
  • Mfr. Part No. 2CSR254101R1505
Each
HK$4,334.57
Temporarily out of stock
Better World
ABB System Pro M Compact S200M MCB, 4P, 10A Curve B, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 746-8080
  • Mfr. Part No. 2CDS274001R0105 S204M-B10
Each
HK$1,075.10
Currently unavailable
ABB S302 MCB, 2P, 20A Curve K, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-760
  • Mfr. Part No. 2CDS382001R0487
Each
HK$1,817.33
Temporarily out of stock
ABB System Pro M Compact SU200 MR Circuit Breaker, 3P, 50A Curve K, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 202-965
  • Mfr. Part No. 2CDS273347R0577
Each
HK$8,959.61
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 1P, 300mA Curve D, 400V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-6585
  • Mfr. Part No. 5SY4114-8
Each
HK$476.20
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