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

2337 of 999+
Temporarily out of stock
Socomec 500A NH Fuse, NH3, 500V
  • RS Stock No. 252-5346
  • Mfr. Part No. 67320500
Each
HK$1,123.78
Temporarily out of stock
Phoenix Contact Surge Protector, DIN Rail Mount
  • RS Stock No. 207-2779
  • Mfr. Part No. 2907878
Each
HK$779.90
Temporarily out of stock
Better World
ABB SN201 MCB, 1P, 40A Curve D
  • RS Stock No. 237-1428
  • Mfr. Part No. 2CSS255101R0401
Each
HK$318.18
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 160A, Fixed Mount
  • RS Stock No. 260-7678
  • Mfr. Part No. C12B4TM160L
Each
HK$9,792.03
In Stock
Better World
Schneider Electric ID RCCB, 40A, 2 Pole, 30mA, Type AC, 240V ac
  • RS Stock No. 214-2096
  • Mfr. Part No. M9R11240
Each
HK$767.80
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - R11 Single Pole Panel Mount, 15A Current Rating
  • RS Stock No. 275-0451
  • Mfr. Part No. R11-2-15.0A-B06CV-V
1 Box of 10
HK$1,605.70
Temporarily out of stock
Eaton, Eaton Moeller Series NZM MCCB Molded Case Circuit Breaker 3P 600A, Breaking Capacity 9 kA, Fixed Mount
  • RS Stock No. 247-148
  • Mfr. Part No. 102687 NS3-400-NA
Each
HK$14,797.41
Temporarily out of stock
Eaton xEffect FAZ MCB, 2P, 4A Curve D, 415V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 240-581
  • Mfr. Part No. 102222 FAZ-D4/2-RT
Each
HK$1,590.42
In Stock
Eaton PFGM RCCB, 63A, 4 Pole, 30mA, Type A, 230 V ac, 400 V ac
  • RS Stock No. 227-0746
  • Mfr. Part No. 267461 PFGM-63/4/003-A
Each
HK$1,118.90
New product - Preorder today
Fuse - Strip 60 w/ Housing 48VDC, 500A
  • RS Stock No. 522-974
  • Mfr. Part No. 157.5701.6501
1 Pack of 50
HK$7,112.57
Temporarily out of stock
Carling Technologies Thermal Circuit Breaker - A 2 Pole 277V Voltage Rating Panel Mount, 20A Current Rating
  • RS Stock No. 881-4771
  • Mfr. Part No. AG2-B0-26-620-111-D
Each
HK$920.60
In Stock
Eaton 10A F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 848-2738
  • Mfr. Part No. AGC-10-R
Each
HK$9.00
Temporarily out of stock
Siemens SENTRON 5SY Circuit Breaker, 1P + N, 2A Curve C, 250V AC, 60V DC, 70 kA Breaking Capacity
  • RS Stock No. 664-331
  • Mfr. Part No. 5SY8502-7
Each
HK$878.05
Temporarily out of stock
HENSEL ENYBOARD Distribution Board, 28 A
  • RS Stock No. 116-955
  • Mfr. Part No. RK 0405 T
Each
HK$234.70
In Stock
Better World
Schneider Electric iID RCCB, 63A, 2 Pole, 30mA
  • RS Stock No. 734-9343
  • Mfr. Part No. A9R11263
Each
HK$2,831.25
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 500A, Breaking Capacity 4 kA, Fixed Mount
  • RS Stock No. 231-473
  • Mfr. Part No. 109679 NZMC3-S500
Each
HK$21,307.90
In Stock
ABB High Performance S800S MCB, 3P, 80A Curve C, 400V AC, 250V DC, 50 kA Breaking Capacity
  • RS Stock No. 435-504
  • Mfr. Part No. 2CCG001232R0001
Each
HK$2,777.80
Temporarily out of stock
Miniature circuit breaker, 13 A, 2p
  • RS Stock No. 611-259
  • Mfr. Part No. PLSM-C13/2-MW
Each
HK$589.80
In Stock
TE Connectivity Thermal Circuit Breaker - W58 Single Pole 50 V dc, 250V ac Voltage Rating, 15A Current Rating
  • RS Stock No. 782-0902
  • Mfr. Part No. W58-XB1A4A-15
Each
HK$59.70
In Stock
Littelfuse 500mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-4347
  • Mfr. Part No. 0217.500MXP
Each (In a Pack of 10)
HK$2.66
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