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

2255 of 999+
In Stock
Eaton 200A Centred Tag Fuse, NH000, 690V ac
  • RS Stock No. 182-1408
  • Mfr. Part No. 170M1570D
Each (In a Box of 10)
HK$1,863.15
Temporarily out of stock
ABB Blanking Plate for use with MCB
  • RS Stock No. 231-9623
  • Mfr. Part No. 2CDL000001R1220 SZ-BP 12G
1 Box of 1
HK$42.70
Limited stock
ETA REX12 Electronic Circuit breaker 1A 24V REX12-T, DIN Rail Mount
  • RS Stock No. 175-0370
  • Mfr. Part No. REX12-TA2-107-DC24V-1A/1A
Each
HK$583.50
In Stock
Mersen 100A NH Fuse, NH000, 690V ac
  • RS Stock No. 448-3320
  • Mfr. Part No. V320063
Each
HK$489.98
Temporarily out of stock
Siemens ALPHA Terminal
  • RS Stock No. 226-2882
  • Mfr. Part No. 8JK401
Each
HK$422.10
In Stock
Siemens SENTRON 1 Phase Busbar, 27mm Pitch
  • RS Stock No. 187-5178
  • Mfr. Part No. 5ST3648
Each
HK$119.90
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 80A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 269-589
  • Mfr. Part No. 3VA5280-5EF31-2AA0
Each
HK$8,705.50
Temporarily out of stock
ABB Tmax XT Extended Front Terminal for use with Circuit Breaker
  • RS Stock No. 232-0232
  • Mfr. Part No. 1SDA066898R1 ES XT3 4PCS
Each
HK$539.90
Temporarily out of stock
ABB S800S MCB, 2P, 50A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-485
  • Mfr. Part No. 2CCS862001R0577
Each
HK$5,257.12
Temporarily out of stock
Eaton 225 → 400A Ferrule Fuse Block, 600V
  • RS Stock No. 182-1351
  • Mfr. Part No. JM60400-3CR
Each
HK$16,222.90
In Stock
Europa EUC3P EUC MCB, 3P, 50A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6604
  • Mfr. Part No. EUC3P50C
Each
HK$172.50
In Stock
Better World
Siemens Sentron 5SY4 MCB, 3P, 40A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3177
  • Mfr. Part No. 5SY4340-7
Each
HK$1,130.80
In Stock
TE Connectivity Thermal Circuit Breaker - W28 Single Pole 32 V dc, 250V ac Voltage Rating, 16A Current Rating
  • RS Stock No. 782-6571
  • Mfr. Part No. W28-XQ1A-16
Each
HK$35.10
Temporarily out of stock
ABB S-ARC1 MCB, 1+N, 6A Curve C, 240V AC, 6 kA Breaking Capacity
  • RS Stock No. 175-9922
  • Mfr. Part No. 2CSA255901R9064 S-ARC1 C6
Each
HK$1,810.84
Temporarily out of stock
ABB S803N MCB, 3P, 20A Curve B, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-399
  • Mfr. Part No. 2CCS893001R0205
Each
HK$4,710.40
Temporarily out of stock
Eaton xEffect FAZ MCB, 1P, 1.5A Curve D, 240V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 248-707
  • Mfr. Part No. 102139 FAZ-D1,5/1-RT
Each
HK$752.43
Temporarily out of stock
Legrand Electronic Circuit breaker, 30A, 4 Pole, 440V
  • RS Stock No. 255-2315
  • Mfr. Part No. 401010
Each
HK$4,193.04
In Stock
Mersen 80A FF Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 136-0504
  • Mfr. Part No. E1018559 / FR22GR69V80
Each (In a Box of 10)
HK$247.38
In Stock
Lovato ModuLo P1MB MCB, 1P, 2A Curve B, 230V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 825-5548
  • Mfr. Part No. P1MB1PB02
Each
HK$240.60
Temporarily out of stock
ABB F200 RCCB, 80A, 2 Pole, 30mA, Type A, 230V ac
  • RS Stock No. 225-6101
  • Mfr. Part No. 2CSF202101R1800 F202 A-80/0.03
Each
HK$2,130.80
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