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

2332 of 999+
Temporarily out of stock
Eaton 16A Cartridge Fuses, 50.8 x 565mm
  • RS Stock No. 253-690
  • Mfr. Part No. 24ADIHA16
1 Pack of 3
HK$29,975.80
Temporarily out of stock
ABB, SACE FORMULA MCCB Molded Case Circuit Breaker 1P 63A, Fixed Mount
  • RS Stock No. 231-9300
  • Mfr. Part No. 1SDA075871R1 KIT FC Cu XT1 14-1/0 AWG 6
Each
HK$1,397.61
In Stock
Schurter TA36 Rocker Circuit Breaker - TA36 2 Pole 60 V dc, 277 V ac Voltage Rating, 3A Current Rating
  • RS Stock No. 221-5635
  • Mfr. Part No. 3-128-239
Each
HK$156.50
In Stock
Better World
Siemens RCBO, 16A Current Rating, 4P Poles, 300mA Trip Sensitivity, Type B, Sentron Range
  • RS Stock No. 243-6242
  • Mfr. Part No. 5SU1646-6FP16
Each
HK$2,425.50
In Stock
Better World
Siemens RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type B, Sentron Range
  • RS Stock No. 150-4176
  • Mfr. Part No. 5SU1354-6KK10
Each
HK$1,047.60
In Stock
Better World
Schneider Electric Multi 9 C60SP MCB, 1P, 2A Curve C, 240 → 415V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 219-9114
  • Mfr. Part No. M9F22102
Each
HK$141.80
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 40A, Fixed Mount
  • RS Stock No. 260-9498
  • Mfr. Part No. C10N3TM040
Each
HK$6,142.08
Temporarily out of stock
Eaton QSA Series Fuse Cover
  • RS Stock No. 244-870
  • Mfr. Part No. 1319423 QSAFCOVER100N1-A4/3
Each
HK$703.13
In Stock
Better World
Schneider Electric Multi 9 MCB, 2P, 10A Curve D, 10 kA Breaking Capacity
  • RS Stock No. 219-9166
  • Mfr. Part No. M9F43210
Each
HK$1,544.10
Temporarily out of stock
ABB Tmax XT Trip Unit for use with XT4
  • RS Stock No. 236-7275
  • Mfr. Part No. 1SDA067381R1 TMA 40-400 XT4 3p
Each
HK$4,124.96
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - 219 3 Pole 480V ac Voltage Rating Panel Mount, 50A Current Rating
  • RS Stock No. 275-0067
  • Mfr. Part No. 219-3-1-65-8-9-50
Each
HK$2,131.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9378
  • Mfr. Part No. 3VA1163-3ED46-0AA0
Each
HK$4,031.80
Temporarily out of stock
Siemens 200A Centred Tag Fuse, NH2, 500V ac
  • RS Stock No. 203-1974
  • Mfr. Part No. 3NA6240
Each (In a Pack of 3)
HK$206.90
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 630A, Fixed Mount
  • RS Stock No. 260-8263
  • Mfr. Part No. C63W42D630
Each
HK$62,102.72
Temporarily out of stock
Better World
Schneider Electric Circuit Trip
  • RS Stock No. 212-0253
  • Mfr. Part No. LV432093
Each
HK$13,525.83
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 6.3kA 1SDA07, 4 channels
  • RS Stock No. 259-3911
  • Mfr. Part No. 1SDA071939R1
Each
HK$561,536.25
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 209-5169
  • Mfr. Part No. 3VA2163-5KP36-0AA0
Each
HK$11,826.20
Temporarily out of stock
Eaton xEffect - FBSmV RCCB, 40A, 2 Pole, 300mA, Type A, 240/415V ac
  • RS Stock No. 123-192
  • Mfr. Part No. 170211 FBSMV-40/2/03-A
Each
HK$931.70
In Stock
Mersen 800mA T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 270-3096
  • Mfr. Part No. Q090542
Each (In a Box of 10)
HK$4.19
Temporarily out of stock
Mersen 20A FF Cartridge Fuse, 14 x 51mm
  • RS Stock No. 136-0581
  • Mfr. Part No. F1017203 / FR14GR69V20
Each
HK$145.70
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