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

2325 of 999+
Siemens ALPHA Distribution Board
  • RS Stock No. 272-0265
  • Mfr. Part No. 8GK1051-2KK30
Each
HK$9,384.80
Eaton 32A Rail Mount Fuse Holder
  • RS Stock No. 418-647
  • Mfr. Part No. RS32LOCK
Each (In a Pack of 3)
HK$394.60
Better World
Siemens, SENTRON MCCB 4P 400A, Breaking Capacity 55 kA
  • RS Stock No. 209-7075
  • Mfr. Part No. 3VA2340-5HL42-0AA0
Each
HK$20,892.90
ABB S303 MCB, 3P, 500mA Curve C, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 201-361
  • Mfr. Part No. 2CDS383001R0984
Each
HK$3,320.67
ABB SU200 M MCB, 1P, 500mA, Type Z, 277V AC, 48V DC, 15 kA Breaking Capacity
  • RS Stock No. 203-850
  • Mfr. Part No. 2CDS271337R0158
Each
HK$996.77
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 90A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 269-680
  • Mfr. Part No. 3VA5290-5ED31-1AA0
Each
HK$7,332.70
ABB System Pro M Compact S200 MCB, 3P, 6A, Type Z, 400V AC, 110V DC, 10 kA Breaking Capacity
  • RS Stock No. 203-720
  • Mfr. Part No. 2CDS253001R0378
Each
HK$2,592.69
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 150A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-936
  • Mfr. Part No. 3VA6115-7JQ41-0AA0
Each
HK$29,129.80
Better World
Siemens SENTRON Electronic Circuit Breaker 500A 3VA, 3 channels
  • RS Stock No. 155-833
  • Mfr. Part No. 3VA2440-0MS32-0AA0
Each
HK$25,690.00
ABB Tmax XT Trip Unit for use with Tmax XT
  • RS Stock No. 236-7263
  • Mfr. Part No. 1SDA067342R1 Ekip LSI In=63A XT2 4p
Each
HK$9,581.32
ABB RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6958
  • Mfr. Part No. 2CSR255080R1105 DS201 B10 AC30
Each
HK$928.40
Sensata Airpax Airpax Thermal Circuit Breaker - CPP Single Pole Panel Mount, 5A Current Rating
  • RS Stock No. 275-0187
  • Mfr. Part No. CPP11-52-5.00A-OC-V
1 Box of 10
HK$1,986.00
Better World
ABB, Tmax XT MCCB 3P 100A, Fixed Mount
  • RS Stock No. 236-7494
  • Mfr. Part No. 1SDA067769R1 XT2S 160 MA 100 FF
Each
HK$2,994.07
Better World
Schneider Electric Multi 9 C60SP MCB, 1P, 13A Curve D, 415V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 211-2388
  • Mfr. Part No. M9F23113
Each
HK$254.00
Eaton, xEnergy MCCB 1P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 537-5595
  • Mfr. Part No. 259125 NZMH2-VE100
Each
HK$6,982.84
ABB RCBO, 10A Current Rating, 1P Poles, Type B
  • RS Stock No. 237-5246
  • Mfr. Part No. 2CSR275151R0105
Each
HK$1,405.04
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 70A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 269-609
  • Mfr. Part No. 3VA5270-5EF41-0AA0
Each
HK$9,291.40
ABB System Pro M Compact S200 M UC MCB, 3P, 500mA Curve K, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 201-210
  • Mfr. Part No. 2CDS273061R0157
Each
HK$4,271.38
Siemens 160A Centred Tag Fuse, NH2, 500V ac
  • RS Stock No. 203-2001
  • Mfr. Part No. 3NA7236
Each (In a Pack of 3)
HK$144.133
Siemens Cover for use with 5ST3 7 MCB
  • RS Stock No. 521-4636
  • Mfr. Part No. 5ST3750
Each
HK$16.30
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