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

194 of 999+
In Stock
Schurter PC Board Non Resettable Fuse, Radial 400mA, 250V ac
  • RS Stock No. 284-5293
  • Mfr. Part No. 0034.6611
Each (In a Pack of 10)
HK$3.41
In Stock
Bourns Surface Mount Fuse 4A, 65V dc
  • RS Stock No. 245-9262
  • Mfr. Part No. SF-1206SA400M-2
Each (On a Tape of 10)
HK$7.08
In Stock
Littelfuse PC Board Non Resettable Fuse, Axial 500mA, 125V ac/dc
  • RS Stock No. 541-3259P
  • Mfr. Part No. 0251.500NRT1L
Each (Supplied in a Bag)
HK$6.60
In Stock
SIBA SMD Non Resettable Fuse 2.5A, 250V
  • RS Stock No. 736-2683P
  • Mfr. Part No. 160016.2,5
Each (Supplied on a Reel)
HK$127.80
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 2A, 250V ac
  • RS Stock No. 226-6555
  • Mfr. Part No. 37012000000
Each (In a Pack of 10)
HK$5.25
In Stock
Schurter SMD Non Resettable Fuse 750mA, 125V ac/dc
  • RS Stock No. 600-7338
  • Mfr. Part No. 3410.0029.01
Each (In a Pack of 20)
HK$23.775
Temporarily out of stock
Eaton 63A Tag Fuse, 21 x 87mm, 500V, 74mm
  • RS Stock No. 228-653
  • Mfr. Part No. BAO63M100
1 Pack of 20
HK$6,986.90
Temporarily out of stock
Hager CGC RCD Switch, 63A, 4 Pole, 500mA, Type AC, 230 → 400V
  • RS Stock No. 599-856
  • Mfr. Part No. CGC863F
Each
HK$4,497.00
Temporarily out of stock
Eaton 20A Cartridge Fuse, 1.375 x 0.435in
  • RS Stock No. 261-688
  • Mfr. Part No. TPA-20
1 Pack of 10
HK$3,605.30
Temporarily out of stock
Eaton 60A Glass Melamine Cartridge Fuse, 0.56 x 0.87in
  • RS Stock No. 263-421
  • Mfr. Part No. TPS-60
1 Pack of 10
HK$4,256.50
In Stock
ETA Thermal Circuit Breaker - 3120-N 5 Pole 50 V DC, 240 V AC Voltage Rating, 1A Current Rating
  • RS Stock No. 210-2087
  • Mfr. Part No. 3120-N551-H7T1-W02D-1A
Each
HK$285.70
In Stock
Littelfuse 0.33A Resettable Fuse, 240V dc
  • RS Stock No. 495-0741P
  • Mfr. Part No. LVR033K
Each (Supplied in a Bag)
HK$5.20
Temporarily out of stock
ABB RCBO, 63A Current Rating, 3P Poles, Type B
  • RS Stock No. 237-5187
  • Mfr. Part No. 2CSR273101R1635
Each
HK$3,696.43
In Stock
Eaton 20A British Standard Fuse, F1, 550V ac
  • RS Stock No. 413-513
  • Mfr. Part No. NSD20
Each (In a Pack of 5)
HK$54.82
Temporarily out of stock
Schneider Electric Acti9 Acti9 Reflex MCB, 4P, 25A Curve B, 230V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 354-359
  • Mfr. Part No. A9C61425
Each
HK$5,290.90
In Stock
Better World
Siemens SENTRON 5SY7 MCB, 2P, 2A Curve C, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 209-6706
  • Mfr. Part No. 5SY7202-7
Each
HK$825.70
In Stock
Eaton xEffect MCB, 3P, 10A Curve B, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4384
  • Mfr. Part No. 239111 FAZ6-B10/3
Each
HK$673.70
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 630A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 246-847
  • Mfr. Part No. 191587 NZMN3-AX630-BT
Each
HK$29,962.80
Temporarily out of stock
315A NH Fuse, 51 x 21 x 79mm, 500V ac
  • RS Stock No. 262-189
  • Mfr. Part No. 315NHG2BI
1 Pack of 3
HK$534.80
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 250A, Breaking Capacity 9 kA, Plug In
  • RS Stock No. 239-767
  • Mfr. Part No. 192301 NZMH3-4-PX250/VAR-SVE
Each
HK$43,552.90
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