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

2253 of 999+
In Stock
Better World
Siemens 5SV4312 RCCB, 25A, 2 Pole, 30mA, Type AC, 230V ac
  • RS Stock No. 231-8387
  • Mfr. Part No. 5SV4312-0
Each
HK$1,213.90
In Stock
Eaton 16A Tag Fuse, 550V ac
  • RS Stock No. 228-812
  • Mfr. Part No. NSD16
1 Pack of 20
HK$1,576.40
In Stock
Better World
Siemens SENTRON 5SY5 MCB, 2P, 20A Curve C, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 212-8889
  • Mfr. Part No. 5SY5220-7
Each
HK$1,735.50
Temporarily out of stock
ABB F200 RCCB, 63A, 2 Pole, 300mA, Type A, 230/400V ac
  • RS Stock No. 177-5079
  • Mfr. Part No. 2CSF202201R3630 F202 A S-63/0,3
Each
HK$1,890.28
Temporarily out of stock
Eaton RCBO, 13A Current Rating, 4P Poles, 30mA Trip Sensitivity, Type A, Type D, FRBm6 Range
  • RS Stock No. 123-348
  • Mfr. Part No. 170893 FRBM6-D13/3N/003-A
Each
HK$2,055.20
In Stock
Eaton 250A British Standard Fuse, B3, 415V ac, 111mm
  • RS Stock No. 139-984
  • Mfr. Part No. ED250
Each
HK$498.80
Temporarily out of stock
Eaton MCB, 3P, 8A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 244-009
  • Mfr. Part No. 101318 PLI-C8/3
Each
HK$1,385.80
Temporarily out of stock
Siemens, SENTRON MCCB 3P 630A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 272-0173
  • Mfr. Part No. 3VA1563-5MH32-0AA0
Each
HK$23,325.50
Currently unavailable
Siemens, 3RA9012 Series
  • RS Stock No. 156-520
  • Mfr. Part No. 3RA9012-7AA01
Each
HK$1,198.90
Temporarily out of stock
Siemens 630A Tag Fuse, 137mm, 750V
  • RS Stock No. 608-364
  • Mfr. Part No. 3NB1142-1KK11
1 Pack of 3
HK$7,580.00
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3857
  • Mfr. Part No. 3VA2063-7HL32-0AA0
Each
HK$14,074.00
In Stock
ABB RCBO, 20A Current Rating, 3P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 767-4415
  • Mfr. Part No. 2CSR273001R1204 DS203 M AC-C20/0,03
Each
HK$2,756.55
Limited stock
Better World
Siemens SENTRON 5SL6 MCB, 1+N, 4A Curve C, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 209-6555
  • Mfr. Part No. 5SL6004-7
Each
HK$554.20
Temporarily out of stock
Better World
Siemens 5SV3322 RCCB, 25A, 2 Pole, 30mA, Type B, 230V ac
  • RS Stock No. 231-8374
  • Mfr. Part No. 5SV3322-4
Each
HK$5,563.90
Temporarily out of stock
Eaton RCCB, 25A, 4 Pole, 100mA, Type S, 230 V ac, 400 V ac
  • RS Stock No. 227-0703
  • Mfr. Part No. 264298 PFGM-25/4/01-S
Each
HK$3,101.76
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - 219 3 Pole 480V ac Voltage Rating Panel Mount, 15A Current Rating
  • RS Stock No. 275-0068
  • Mfr. Part No. 219-3-1-66-5-8-15
1 Box of 5
HK$10,630.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3588
  • Mfr. Part No. 3VA2010-7JQ46-0AA0
Each
HK$39,588.30
Temporarily out of stock
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4825
  • Mfr. Part No. 3VA2563-7HM42-0AA0
Each
HK$79,344.40
Temporarily out of stock
ABB S801N MCB, 1P, 6A Curve C, 400V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-872
  • Mfr. Part No. 2CCS891001R0064
Each
HK$1,628.08
In Stock
ABB High Performance S800N MCB, 2P, 63A Curve C, 400V AC, 36 kA Breaking Capacity
  • RS Stock No. 435-566
  • Mfr. Part No. 2CCS892001R0634 S802N-C63
Each
HK$1,492.50
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