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

88 of 999+
Temporarily out of stock
ABB S-ARC1 M MCB, 1+N, 10A Curve C, 240V AC, 10 kA Breaking Capacity
  • RS Stock No. 175-9934
  • Mfr. Part No. 2CSA275901R9104 S-ARC1 M C10
Each
HK$2,078.78
Temporarily out of stock
ABB High Performance S800C MCB, 1P, 10A Curve C
  • RS Stock No. 232-0316
  • Mfr. Part No. 2CCS881001R0104 S801C C 10A - 25 KA
Each
HK$439.10
In Stock
Mersen Surge Protector, 50kA, 1000V (Volts), DIN Rail Mount
  • RS Stock No. 361-604
  • Mfr. Part No. 44020001
Each
HK$267.80
Temporarily out of stock
Schneider Electric ComPacT Control Unit for use with Compact NS630b to NS3200
  • RS Stock No. 346-764
  • Mfr. Part No. C6EFM
Each
HK$43,320.24
In Stock
Littelfuse 250mA F Ceramic Cartridge Fuse, 3 x 8.4mm
  • RS Stock No. 738-3096P
  • Mfr. Part No. 0242.250UR
Each (Supplied on a Reel)
HK$42.70
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 250A, Fixed Mount
  • RS Stock No. 260-7938
  • Mfr. Part No. C25N34V250
Each
HK$36,428.48
Temporarily out of stock
Eaton Fuse Holder Adapter
  • RS Stock No. 260-718
  • Mfr. Part No. BC3
1 Pack of 2
HK$67.30
Temporarily out of stock
Socomec 3 Phase Industrial Surge Protector, 40kA
  • RS Stock No. 224-2519
  • Mfr. Part No. 49821432
Each
HK$5,944.94
In Stock
Europa EUC3P EUC MCB, 3P, 25A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6597
  • Mfr. Part No. EUC3P25C
Each
HK$151.30
Being discontinued
RS PRO PC Board Non Resettable Fuse, Axial 15A, 32V ac/dc
  • RS Stock No. 764-9508
Each (In a Pack of 10)
HK$3.15
In Stock
RS PRO MCB, 3P, 6A Curve C, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 265-0209
Each
HK$282.80
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 3 kA, Fixed Mount
  • RS Stock No. 251-847
  • Mfr. Part No. 193307 NZMH2-4-VX100-T
Each
HK$17,959.00
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 50A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-413
  • Mfr. Part No. 3VA5150-4ED31-0AA0
Each
HK$3,626.60
In Stock
RS PRO Residential RCCBs, 25A, 4 Pole, 30mA, Type A, 400V
  • RS Stock No. 284-2372
Each
HK$539.74
Temporarily out of stock
Siemens SENTRON Connection Unit for use with Circuit Breaker 3WL10 / 3VA27
  • RS Stock No. 266-700
  • Mfr. Part No. 3VW9011-0AN73
Each
HK$6,018.50
Temporarily out of stock
Siemens Sentron Short circuit alarm switch for use with 3VA Series Circuit Breaker
  • RS Stock No. 874-4528
  • Mfr. Part No. 3VA9988-0AB32
Each
HK$294.30
In Stock
Siemens 2A D01 Neozed Fuse, gG, 400V ac
  • RS Stock No. 622-0907
  • Mfr. Part No. 5SE2302
Each (In a Pack of 10)
HK$12.11
Temporarily out of stock
Siemens SENTRON Withdrawable Unit for use with Circuit Breaker
  • RS Stock No. 157-794
  • Mfr. Part No. 3VA9324-0KD10
Each
HK$5,709.10
In Stock
Littelfuse 1.85A Resettable Fuse, 72V
  • RS Stock No. 517-6720
  • Mfr. Part No. RXEF185
Each (In a Pack of 10)
HK$3.33
Temporarily out of stock
Eaton 40A Glass Melamine Cartridge Fuse, 0.56 x 0.87in
  • RS Stock No. 260-711
  • Mfr. Part No. TPS-40
1 Pack of 10
HK$4,256.50
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