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

2291 of 999+
In Stock
Littelfuse SMD Non Resettable Fuse 1A, 125V ac/dc
  • RS Stock No. 219-6226
  • Mfr. Part No. 0154001.DRT
Each (In a Pack of 10)
HK$16.65
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 160A 3VA2, 4 channels
  • RS Stock No. 157-249
  • Mfr. Part No. 3VA2116-5KQ42-0AA0
Each
HK$23,292.20
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 4P, 1A, Type Z, 415V AC, 100 kA Breaking Capacity
  • RS Stock No. 202-844
  • Mfr. Part No. 2CDS384001R0218
Each
HK$5,918.21
Temporarily out of stock
ABB Tmax Adapter for use with Tmax T
  • RS Stock No. 237-5989
  • Mfr. Part No. 1SDA055173R1 T4-6
Each
HK$163.47
Temporarily out of stock
Eaton 32A Slow-Blow Cartridge Fuse, 22.2 x 58mm
  • RS Stock No. 229-001
  • Mfr. Part No. C22M32S CYL FUSE STR 22x58mm 32A GG 690V AC
1 Pack of 10
HK$1,241.10
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 40A 3VA2, 4 channels
  • RS Stock No. 157-416
  • Mfr. Part No. 3VA2140-8JP46-0AA0
Each
HK$19,687.00
Temporarily out of stock
RS PRO 500mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 668-6063
Each (In a Pack of 10)
HK$4.52
In Stock
FUSE 125V PICO II SB RoHS .500A
  • RS Stock No. 552-262
  • Mfr. Part No. 0473.500MAT1L
1 Bag of 100
HK$872.70
Temporarily out of stock
ABB PBSC 3, 3+N Phase Busbar
  • RS Stock No. 202-504
  • Mfr. Part No. 1STQ007423A0000
Each
HK$13,925.67
Temporarily out of stock
ETA Thermal Circuit Breaker - 1110 Single Pole 250V Voltage Rating Panel Mount, 500mA Current Rating
  • RS Stock No. 416-944
  • Mfr. Part No. 1110-F112-P1M1-0.5A
Each
HK$197.20
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 630A, Breaking Capacity 9 kA, Fixed Mount
  • RS Stock No. 232-063
  • Mfr. Part No. 110909 NZMH3-4-AE630/400-T
Each
HK$45,303.71
Temporarily out of stock
Siemens ALPHA Assembly Kit for use with Terminal Block
  • RS Stock No. 629-292
  • Mfr. Part No. 8GK4051-5KK11
Each
HK$1,461.85
Temporarily out of stock
Eaton 63A Cartridge Fuses, 76 x 461mm
  • RS Stock No. 243-212
  • Mfr. Part No. 12BFGHD63
1 Pack of 3
HK$18,819.80
In Stock
SIBA 500mA F Glass Cartridge Fuse, 5 x 30mm
  • RS Stock No. 361-8159
  • Mfr. Part No. 171530.0,5
Each (In a Pack of 10)
HK$15.58
In Stock
Eaton xEffect MCB, 1P, 1.6A Curve C, 240 → 415V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 270-5263
  • Mfr. Part No. 278548 FAZ-C1,6/1
Each
HK$454.30
Temporarily out of stock
Mersen 63A Neutral Link for F2 Fuses
  • RS Stock No. 178-1169
  • Mfr. Part No. E239135 / BNEUTRALF2
Each (In a Pack of 10)
HK$23.474
Temporarily out of stock
Better World
ABB System Pro M Compact S200M MCB, 1P, 32A, Type Z
  • RS Stock No. 225-6010
  • Mfr. Part No. 2CDS271001R0538 S201M Z 32A - 15 KA
Each
HK$376.96
In Stock
Schurter 16A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 1P, 250V ac
  • RS Stock No. 173-9774
  • Mfr. Part No. 7093.0110
Each (In a Box of 10)
HK$648.09
In Stock
Schurter PC Board Non Resettable Fuse, Radial 3.15A, 250V ac
  • RS Stock No. 284-5158
  • Mfr. Part No. 0034.6019
Each (In a Pack of 10)
HK$3.29
Limited stock
Better World
Schneider Electric Acti 9 4 Phase Busbar, 415V ac, 18mm Pitch
  • RS Stock No. 776-2774
  • Mfr. Part No. A9XPH518
Each
HK$545.90
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