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

2335 of 999+
Temporarily out of stock
Eaton NZM Door Coupling Handle for use with N(S)2(-4), NZM2(-4), PN2(-4)
  • RS Stock No. 125-983
  • Mfr. Part No. 172530 NZM2-XTVDKL
Each
HK$1,769.75
Temporarily out of stock
ABB S800U MCB, 3P, 90A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-794
  • Mfr. Part No. 2CCS863017R0907
Each
HK$10,627.75
In Stock
ABB S302 MCB, 2P, 2A Curve C, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-901
  • Mfr. Part No. 2CDS382001R0024
Each
HK$2,188.40
Temporarily out of stock
Eaton IZMX/INX Electronic Circuit Breaker 2.5kA IZMX/INX Circuit-Breaker, 3 channels , Withdrawable
  • RS Stock No. 132-692
  • Mfr. Part No. 183731 IZMX40B3-V25W-1
Each
HK$148,497.48
In Stock
RS PRO 4.5A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 911-3420
Each (In a Pack of 10)
HK$3.27
In Stock
Siemens 210 → 240V ac Shunt Trip Shunt trip for use with 3RV2 Series Circuit Breakers
  • RS Stock No. 706-1976
  • Mfr. Part No. 3RV2902-2DP0
Each
HK$708.30
Temporarily out of stock
355A Tag Fuse, 54 x 150mm, 400V
  • RS Stock No. 262-519
  • Mfr. Part No. 355NHG03B-400
1 Pack of 3
HK$587.20
Temporarily out of stock
Siemens ALPHA Distribution Board
  • RS Stock No. 272-0289
  • Mfr. Part No. 8GK1061-4KK40
Each
HK$13,302.80
Temporarily out of stock
Eaton, Eaton Moeller Series NZM MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 4 kA, Fixed Mount
  • RS Stock No. 231-228
  • Mfr. Part No. 109691 NZMC3-4-A400/250
Each
HK$22,284.48
In Stock
Littelfuse 160mA F Ceramic Cartridge Fuse, 3 x 8.4mm
  • RS Stock No. 738-3119
  • Mfr. Part No. 0242.160UAT1
Each
HK$36.40
Temporarily out of stock
Eaton IZMX/INX Electronic Circuit Breaker 1.6kA , DIN Rail
  • RS Stock No. 127-516
  • Mfr. Part No. 183397 IZMX16H4-V16W-1
Each
HK$115,576.28
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 260-317
  • Mfr. Part No. 3VA6325-6HL31-2AA0
Each
HK$23,186.60
In Stock
Littelfuse 3A Purple Blade Car Fuse, 32V dc
  • RS Stock No. 787-4142P
  • Mfr. Part No. 0287003.PXCN
Each (Supplied in a Bag)
HK$2.02
In Stock
Eaton xEffect MCB, 1P, 16A Curve C, 240 → 415V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-6905
  • Mfr. Part No. 102090 FAZ-C16/1-NA
Each
HK$346.20
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 125A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 230-373
  • Mfr. Part No. 113264 NZMN2-4-A125-SVE
Each
HK$12,574.55
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 2P 40A, Breaking Capacity 25 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-618
  • Mfr. Part No. 3VA5140-4ED21-0AA0
Each
HK$2,047.50
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA5
  • RS Stock No. 269-7207
  • Mfr. Part No. 3VA9474-0QA00
Each (In a Pack of 4)
HK$214.375
Temporarily out of stock
Siemens 12A Cartridge Fuse
  • RS Stock No. 210-7011
  • Mfr. Part No. 3NW8006-1
Each (In a Pack of 10)
HK$75.82
In Stock
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX250
  • RS Stock No. 260-7837
  • Mfr. Part No. C253TM200
Each
HK$9,046.10
In Stock
Better World
Schneider Electric ComPact NSX, Easy Pact CVS Cover for use with ComPact NSX, Easy Pact CVS
  • RS Stock No. 219-9359
  • Mfr. Part No. LV429516
Each
HK$273.40
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