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

2254 of 999+
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
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
Siemens, 3RA9012 Series
  • RS Stock No. 156-520
  • Mfr. Part No. 3RA9012-7AA01
Each
HK$1,198.90
Siemens 630A Tag Fuse, 137mm, 750V
  • RS Stock No. 608-364
  • Mfr. Part No. 3NB1142-1KK11
1 Pack of 3
HK$7,580.00
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
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
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
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
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
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
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
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
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
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
Europa EUC1P EUC MCB, 1P, 32A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6513
  • Mfr. Part No. EUC1P32C
Each
HK$68.60
Eaton xEffect MCB, 3+N, 15A Curve C
  • RS Stock No. 230-0960
  • Mfr. Part No. 177468 FAZ6-C15/3N
Each
HK$480.32
RS PRO 80A Slotted Tag Fuse, 17.4 x 42mm, 240V, 42mm
  • RS Stock No. 188-4504
Each (In a Box of 200)
HK$158.545
Mersen 2A Time Lag Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 630-842
  • Mfr. Part No. Z085375Q
1 Box of 10
HK$134.77
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 260-245
  • Mfr. Part No. 3VA6325-0HL31-0AA0
Each
HK$28,125.30
Better World
Siemens 5SV3344 RCCB, 40A, 4 Pole, 30mA, Type A, 400V ac
  • RS Stock No. 231-8380
  • Mfr. Part No. 5SV3344-6GV02
Each (In a Pack of 18)
HK$824.561
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