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

2358 of 999+
Temporarily out of stock
160A Cartridge Fuses, 76 x 292mm
  • RS Stock No. 262-319
  • Mfr. Part No. 7.2MRLSA160
Each
HK$11,083.80
Temporarily out of stock
Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 253-190
  • Mfr. Part No. 192364 NZMN3-PX400-BT
Each
HK$32,182.70
Temporarily out of stock
Siemens, SENTRON MCCB 3P 630A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 272-0178
  • Mfr. Part No. 3VA1563-7EF32-0AA0
Each
HK$27,790.10
Temporarily out of stock
Eaton 400A 0.001 x 0.001in Modular Fuse Fuse Block, 2.5kV
  • RS Stock No. 260-720
  • Mfr. Part No. BH-1131
Each
HK$3,339.50
In Stock
Omron Busbar
  • RS Stock No. 111-3535
  • Mfr. Part No. PYDN-7.75-030S
Each
HK$13.90
Temporarily out of stock
Eaton 63A Cartridge Fuse, 51 x 292mm
  • RS Stock No. 261-473
  • Mfr. Part No. 7.2TDLSJ63
Each
HK$2,513.40
In Stock
Electronic Circuit Breaker 2A 24V , 1 channels , DIN Rail
  • RS Stock No. 263-095
  • Mfr. Part No. PXS24E02A002 PXS24E-e2/F
Each
HK$374.80
Temporarily out of stock
Eaton 700A 7.2 x 4.1in Modular Fuse Fuse Block, 1.25kV
  • RS Stock No. 261-702
  • Mfr. Part No. BH-3145
Each
HK$5,153.80
Temporarily out of stock
Eaton Plate for use with N4-4, NZM4-4
  • RS Stock No. 253-647
  • Mfr. Part No. 266815 NZM4-4-XKM1
Each
HK$958.80
Temporarily out of stock
Eaton 1.25kA Tag Fuse, 140 x 250mm, 500V
  • RS Stock No. 261-885
  • Mfr. Part No. EBH4O3TM2-12
Each
HK$15,585.30
Temporarily out of stock
Eaton 160A Fuse Holder for 135 x 470mm Fuse, 3P, 690V
  • RS Stock No. 261-710
  • Mfr. Part No. EBV0023TS8
Each
HK$1,021.80
Temporarily out of stock
Eaton RCCB, 40A, 2 Pole, 100mA, Type AC, 230V ac
  • RS Stock No. 227-0714
  • Mfr. Part No. 264281 PFGM-40/2/01
Each
HK$1,990.39
Temporarily out of stock
355A Cartridge Fuse, 53 x 160mm
  • RS Stock No. 263-409
  • Mfr. Part No. TKM315M355
Each
HK$1,627.50
Temporarily out of stock
Eaton Eaton Moeller IZMX Electronic Circuit Breaker 6.3kA IZMX/INX, Withdrawable
  • RS Stock No. 262-442
  • Mfr. Part No. 303697 IZM-CAS634-6300-1
Each
HK$73,793.00
Temporarily out of stock
Eaton xEffect MCB, 3+N, 1.6A Curve D
  • RS Stock No. 230-0998
  • Mfr. Part No. 177472 FAZ6-D1,6/3N
Each
HK$1,509.62
Temporarily out of stock
Siemens, SENTRON MCCB 3P 1.25kA, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 270-4879
  • Mfr. Part No. 3VA2612-5JP32-0AA0
Each
HK$109,203.40
In Stock
Lovato ModuLo P1MB MCB, 1+N, 6A Curve C, 230V AC, 60V DC, 6 kA Breaking Capacity
  • RS Stock No. 825-5517
  • Mfr. Part No. P1MB1NC06
Each
HK$435.60
Temporarily out of stock
Eaton 1.6kA Fuse Holder for 135 x 470mm Fuse, 3P, 400V
  • RS Stock No. 261-709
  • Mfr. Part No. EBH4O3SM2-16
Each
HK$16,224.00
Temporarily out of stock
Phoenix Contact CB TM Thermal Magnetic Circuit Breakers - CB TM2 2 Pole 277V ac Voltage Rating Base Mounting, 12A
  • RS Stock No. 512-390
  • Mfr. Part No. 2800888
Each
HK$772.60
Temporarily out of stock
Better World
Siemens, 0AA0 MCCB 4P 20A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 211-6001
  • Mfr. Part No. 3VA1120-6EF42-0AA0
Each
HK$4,281.10
1
2358
2364
Results per page

Related links