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

2350 of 999+
Siemens, SENTRON MCCB 3P 450A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 257-249
  • Mfr. Part No. 3VA5445-7EC31-0AA0
Each
HK$25,865.20
Siemens SENTRON 2 Phase Busbar, 1mm Pitch
  • RS Stock No. 226-0820
  • Mfr. Part No. 5ST3664-0HG
Each (In a Pack of 10)
HK$137.14
Legrand DX Range DX3 MCB, 4P, 100A Curve C, 16 kA Breaking Capacity
  • RS Stock No. 731-9774
  • Mfr. Part No. 4 093 63
Each
HK$9,063.40
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 260-663
  • Mfr. Part No. 3VA6340-0KQ31-0AA0
Each
HK$42,104.30
ABB, Tmax XT MCCB 3P 100A, Fixed Mount
  • RS Stock No. 237-6235
  • Mfr. Part No. 1SDA067089R1 XT2N 160 Ekip M 100A FF
Each
HK$6,484.99
Better World
Schneider Electric, Compact MCCB 4P 125A, Breaking Capacity 16 kA, DIN Rail Mount
  • RS Stock No. 178-8073
  • Mfr. Part No. LV426118
Each
HK$4,281.89
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 160A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 229-868
  • Mfr. Part No. 113277 NZMN2-4-VE160-SVE
Each
HK$16,880.77
Littelfuse SMD Non Resettable Fuse 2A, 125V ac/dc
  • RS Stock No. 541-3401P
  • Mfr. Part No. 0451002.MRL
Each (Supplied on a Reel)
HK$6.70
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 147-650
  • Mfr. Part No. 3VA5210-7EC31-1AA0
Each
HK$7,670.20
Eaton 5A Centred Tag Fuse
  • RS Stock No. 854-8989
  • Mfr. Part No. LPJ-5SP
Each
HK$769.90
Better World
Schneider Electric Acti 9 C60H-DC MCB, 1P, 13A Curve C, 250V DC, 20 kA Breaking Capacity
  • RS Stock No. 776-3165
  • Mfr. Part No. A9N61509
Each
HK$628.40
Phoenix Contact Surge Protector, DIN Rail Mount
  • RS Stock No. 170-662
  • Mfr. Part No. 2804636
Each (In a Pack of 10)
HK$679.95
Legrand RCD Switch, 20A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, DX Range
  • RS Stock No. 731-9890
  • Mfr. Part No. 4 107 86
Each
HK$3,416.62
Siemens 100A Fuse Holder for 200 x 106mm Fuse, 3P, 600V
  • RS Stock No. 299-919
  • Mfr. Part No. 3NW7531-6HG
Each
HK$1,054.70
Littelfuse 2A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-4628
  • Mfr. Part No. 0216002.MXP
Each (In a Pack of 10)
HK$10.03
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 800A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 249-562
  • Mfr. Part No. 3VA6580-6HN46-0AA0
Each
HK$63,365.70
Eaton RCBO, 10A Current Rating, 2P Poles, 100mA Trip Sensitivity, Type A, Type B, FRBmM Range
  • RS Stock No. 123-307
  • Mfr. Part No. 170803 FRBMM-B10/2/01-A
Each
HK$1,217.89
ABB Flange for use with Tmax XT
  • RS Stock No. 236-6852
  • Mfr. Part No. 1SDA068656R1
Each
HK$461.80
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 16A Curve D, 400V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-6605
  • Mfr. Part No. 5SY4616-8
Each
HK$1,547.00
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 232-037
  • Mfr. Part No. 109672 NZMH3-A250
Each
HK$21,056.78
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