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

2342 of 999+
Temporarily out of stock
Eaton 20A Cartridge Fuse, 95 x 76mm
  • RS Stock No. 246-330
  • Mfr. Part No. 1713625 LPC20-ADAPTER
1 Pack of 10
HK$129.60
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 450A, Breaking Capacity 9 kA, Withdrawable
  • RS Stock No. 246-909
  • Mfr. Part No. 192339 NZMH3-PMX450-AVE
Each
HK$41,087.30
In Stock
Eaton xEffect MCB, 1P, 2A Curve D, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7027
  • Mfr. Part No. 278572 FAZ-D2/1
Each
HK$214.10
Temporarily out of stock
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX 100/160/250 Circuit Breakers
  • RS Stock No. 260-9378
  • Mfr. Part No. C1047E100
Each
HK$30,212.10
In Stock
Better World
Schneider Electric, ComPact MCCB, Fixed Mount
  • RS Stock No. 221-0946
  • Mfr. Part No. LV429406
Each
HK$1,676.70
In Stock
Eaton RCCB, 40A, 4 Pole, 300mA, Type B, 230 V ac, 400 V ac
  • RS Stock No. 203-9040
  • Mfr. Part No. 300300 PXF-40/4/03-B
Each
HK$5,709.33
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 800A 1SDA07, 4 channels
  • RS Stock No. 259-4629
  • Mfr. Part No. 1SDA072899R1
Each
HK$108,974.30
Temporarily out of stock
Schneider Electric, Powerpact Circuit breaker 4P 20A, Breaking Capacity 65 kA, Clip-On
  • RS Stock No. 444-276
  • Mfr. Part No. BJL46020LU
Each
HK$14,589.36
In Stock
Better World
Schneider Electric Multi 9 C60N MCB, 3P, 10A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 214-2070
  • Mfr. Part No. M9F11310
Each
HK$848.80
In Stock
Littelfuse 6.3A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-4432
  • Mfr. Part No. 021706.3MXP
Each (In a Pack of 10)
HK$2.46
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 2P, 30A Curve C, 400V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 610-294
  • Mfr. Part No. 5SY4230-7
Each
HK$961.99
In Stock
ABB 16A Centred Tag Fuse, NH000, 500V
  • RS Stock No. 779-9940
  • Mfr. Part No. OFAF000H16 1SCA022627R0660
Each
HK$38.20
Temporarily out of stock
ABB SU200 M MCB, 1P, 30A Curve C, 277V AC, 48V DC, 15 kA Breaking Capacity
  • RS Stock No. 200-125
  • Mfr. Part No. 2CDS271337R0304
Each
HK$799.05
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 2kA Ekip Touch LI, 3 channels
  • RS Stock No. 259-3171
  • Mfr. Part No. 1SDA071034R1
Each
HK$69,926.59
Temporarily out of stock
ABB S800U MCB, 4P, 20A, Type Z, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-753
  • Mfr. Part No. 2CCS864017R0205
Each
HK$8,870.55
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4118
  • Mfr. Part No. 3VA2116-8HL32-0AA0
Each
HK$14,444.20
Temporarily out of stock
Better World
Schneider Electric Acti 9 MCB, 1P, 10A Curve C, 230V AC, 7.5 kA Breaking Capacity
  • RS Stock No. 200-6164
  • Mfr. Part No. A9DP2610
Each
HK$2,129.58
In Stock
ABB RCBO, 6A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type C, System Pro M Compact Range
  • RS Stock No. 201-6948
  • Mfr. Part No. 2CSR255180R1064 DS201 C6 A30
Each
HK$965.60
Temporarily out of stock
Better World
Schneider Electric Acti9 iTG40 RCCB, 40A, 4 Pole, 30mA, Type AC, 400V ac
  • RS Stock No. 238-3494
  • Mfr. Part No. A9Y14440
Each
HK$4,570.70
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 1+N, 20A, Type Z, 240V AC, 72V DC, 25 kA Breaking Capacity
  • RS Stock No. 200-735
  • Mfr. Part No. 2CDS381103R0488
Each
HK$1,646.06
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