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

97 of 999+
Temporarily out of stock
Eaton 150A Cartridge Fuse, 2.66 x 1in
  • RS Stock No. 228-825
  • Mfr. Part No. TPL-BF
1 Pack of 5
HK$6,105.80
In Stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 4A Curve C, 400V AC, 110V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-7753
  • Mfr. Part No. 2CDS253001R0044 S203-C4
Each
HK$734.64
Temporarily out of stock
Better World
Siemens SIRIUS Electronic Circuit Breaker 400mA 3RV2, 3 channels , DIN Rail Mount
  • RS Stock No. 159-664
  • Mfr. Part No. 3RV2811-0ED10
Each
HK$1,233.20
Temporarily out of stock
Eaton xE?ect - FRCmM-NA RCCB, 25A, 2 Pole, 30mA, 240/415V ac
  • RS Stock No. 120-294
  • Mfr. Part No. 167119 FRCMM-25/2/003-G/A-NA
Each
HK$1,927.30
In Stock
ABB RCBO, 32A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, System Pro M Compact Range
  • RS Stock No. 914-4070
  • Mfr. Part No. 2CSR255051R1325 DSE201 B32 AC30 - N Blue
Each
HK$395.00
In Stock
ETA Thermal Circuit Breaker - 1658 Single Pole 250V Voltage Rating Panel Mount, 10A Current Rating
  • RS Stock No. 273-0860
  • Mfr. Part No. 1658-G21-02-P10-10A
Each
HK$55.60
Temporarily out of stock
Hager Hager NRN Circuit Breaker, 3P, 10A Curve C, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 599-706
  • Mfr. Part No. NRN310
Each
HK$2,186.80
Temporarily out of stock
Siemens, SENTRON MCCB 4P 225A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-804
  • Mfr. Part No. 3VA5222-5GD41-2AA0
Each
HK$20,308.80
Temporarily out of stock
ABB SU200 M MCB, 4P, 1.6A Curve C, 480V AC, 15 kA Breaking Capacity
  • RS Stock No. 200-873
  • Mfr. Part No. 2CDS274337R0974
Each
HK$4,009.16
Temporarily out of stock
ABB S804N MCB, 4P, 10A Curve C, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-557
  • Mfr. Part No. 2CCS894001R0104
Each
HK$5,919.35
Temporarily out of stock
Better World
Schneider Electric Acti 9 A9F9 MCB, 1P, 32A, Type Z, 230V AC, 72V DC, 20 kA, 15 kA Breaking Capacity
  • RS Stock No. 211-2488
  • Mfr. Part No. A9F92132
Each
HK$464.96
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 1.25kA Ekip Dip LI, 3 channels
  • RS Stock No. 259-3108
  • Mfr. Part No. 1SDA070961R1
Each
HK$55,059.09
Temporarily out of stock
8A Cartridge Fuses, 22.2 x 58mm
  • RS Stock No. 262-938
  • Mfr. Part No. C22G8S
1 Pack of 10
HK$1,174.70
In Stock
ABB, Tmax MCCB 3P 320A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 237-5960
  • Mfr. Part No. 1SDA054316R1 T5N400 FF PR221-LS 320A
Each
HK$9,256.60
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 4P, 63A
  • RS Stock No. 224-7878
  • Mfr. Part No. 3VA1163-5GF42-0AA0
Each
HK$4,662.40
In Stock
Mersen 20A FF Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 136-0615
  • Mfr. Part No. E1014580 / FR10GR69V20
Each
HK$3,922.70
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 1P 25A, Breaking Capacity 18 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-315
  • Mfr. Part No. 3VA5125-5ED11-1AA0
Each
HK$1,243.30
Temporarily out of stock
63A Cartridge Fuse, 76 x 442mm
  • RS Stock No. 263-192
  • Mfr. Part No. 7.2WFMSJ63
Each
HK$6,953.10
Temporarily out of stock
Bourns Surface Mount Fuse 4A, 65V dc
  • RS Stock No. 245-9222
  • Mfr. Part No. SF-1206F400M-2
Each (On a Reel of 3000)
HK$3.181
In Stock
Better World
ABB System Pro M Compact S200M MCB, 1P, 2A Curve C, 253V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 535-4100
  • Mfr. Part No. 2CDS271001R0024 S201M-C2
Each
HK$279.50
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