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

182 of 999+
Temporarily out of stock
Siemens, SENTRON MCCB 4P 400A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 257-230
  • Mfr. Part No. 3VA5340-5GF41-2AA0
Each
HK$26,149.90
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 450A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 246-854
  • Mfr. Part No. 191607 NZMN3-MX450
Each
HK$25,038.00
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 220A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 249-027
  • Mfr. Part No. 192120 NZMN2-PMX220-SVE
Each
HK$23,215.20
Temporarily out of stock
Siemens, SENTRON MCCB 2P 250A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-840
  • Mfr. Part No. 3VA5225-6EC61-0AA0
Each
HK$14,920.70
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 160A, Breaking Capacity 6 kA, Fixed Mount
  • RS Stock No. 240-935
  • Mfr. Part No. 191648 NZMS2-VX160
Each
HK$12,137.20
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 350A, Breaking Capacity 5 kA, Withdrawable
  • RS Stock No. 239-779
  • Mfr. Part No. 192335 NZMN3-PMX350-AVE
Each
HK$34,593.40
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-606
  • Mfr. Part No. 3VA6140-6HL41-2AA0
Each
HK$12,559.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 260-424
  • Mfr. Part No. 3VA6325-7JP31-2AA0
Each
HK$29,972.40
Temporarily out of stock
Siemens, SENTRON MCCB 4P 200A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 257-194
  • Mfr. Part No. 3VA5320-5GC41-2AA0
Each
HK$21,085.60
Temporarily out of stock
Siemens, SENTRON MCCB 3P 200A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-277
  • Mfr. Part No. 3VA5220-1MH31-0AA0
Each
HK$15,231.60
Temporarily out of stock
Siemens, SENTRON MCCB 4P 200A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 257-416
  • Mfr. Part No. 3VA5325-6GF41-0AA0
Each
HK$24,216.30
Temporarily out of stock
Eaton 630A Tag Fuse, 71 x 150mm, 400V
  • RS Stock No. 262-547
  • Mfr. Part No. 630NHG3B-400
1 Pack of 3
HK$785.00
Temporarily out of stock
Siemens, SENTRON MCCB 4P 250A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-834
  • Mfr. Part No. 3VA5225-5GD41-0AA0
Each
HK$17,303.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 260-560
  • Mfr. Part No. 3VA6325-8HN31-0AA0
Each
HK$24,928.30
Temporarily out of stock
Hager CFC RCD Switch, 63A, 2 Pole, 300mA, Type AC, 230V
  • RS Stock No. 599-849
  • Mfr. Part No. CFC163F
Each
HK$2,308.60
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 2A, Breaking Capacity 10 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-716
  • Mfr. Part No. 3VA5102-1MH31-0AA0
Each
HK$4,477.80
In Stock
40A D02 Bottle Fuse, 400V
  • RS Stock No. 263-463
  • Mfr. Part No. 40NZ02
1 Pack of 10
HK$212.70
In Stock
WAGO Electronic Circuit Breaker 2A 24V 787, 1 channels , DIN Rail
  • RS Stock No. 303-310
  • Mfr. Part No. 787-3861/200-1000
Each
HK$432.90
Temporarily out of stock
SENTRON Motor Operator for use with 3VA63/64 Series
  • RS Stock No. 263-527
  • Mfr. Part No. 3VA9447-0HC35
Each
HK$20,459.60
Temporarily out of stock
WAGO Electronic Circuit Breaker 6A 24V 787, 4 channels , DIN Rail
  • RS Stock No. 279-4106
  • Mfr. Part No. 787-1664/006-1054
Each
HK$2,688.70
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