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

183 of 999+
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
Temporarily out of stock
Phoenix Contact PTCB Electronic Circuit Breaker 100mA 24V PTCB E1, 1 channels , DIN Rail
  • RS Stock No. 488-366
  • Mfr. Part No. 1464484
Each
HK$311.70
In Stock
Eaton Eaton Bussmann Brass PCB Mount Fuse Clip for 10mm Cartridge Fuse
  • RS Stock No. 233-0572
  • Mfr. Part No. BK-1A3400-12-R
Each (In a Pack of 10)
HK$4.30
Temporarily out of stock
ABB System Pro M Compact S200 MCB, 2P, 20A Curve B, 440V AC, 125V DC, 20 kA Breaking Capacity
  • RS Stock No. 488-6886
  • Mfr. Part No. 2CDS252001R0205 - S202B20
Each
HK$463.50
Temporarily out of stock
Siemens, SENTRON MCCB 3P 150A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-969
  • Mfr. Part No. 3VA5215-6EC31-0AA0
Each
HK$8,907.40
Temporarily out of stock
Siemens SENTRON Connection Unit for use with Circuit Breaker 3WL10 / 3VA27
  • RS Stock No. 265-652
  • Mfr. Part No. 3VW9011-0AB11
1 Pack of 10
HK$774.20
Temporarily out of stock
Better World
Siemens SIRIUS Electronic Circuit Breaker 1.25A 3RV2, 3 channels , DIN Rail Mount
  • RS Stock No. 159-669
  • Mfr. Part No. 3RV2811-0KD10
Each
HK$2,207.00
Temporarily out of stock
Eaton NZM Circuit Breaker for use with Circuit Breaker
  • RS Stock No. 246-889
  • Mfr. Part No. 192279 NZMN3-4-PX630/VAR
Each
HK$45,922.50
Temporarily out of stock
SENTRON Wire Connector for use with 3VA55, 3VA65/66 Series
  • RS Stock No. 263-794
  • Mfr. Part No. 3VA9674-0JK32
1 Kit
HK$19,244.10
Temporarily out of stock
SENTRON for use with 3VA6 Series
  • RS Stock No. 263-859
  • Mfr. Part No. 3VA9977-0TA20
Each
HK$9,297.90
Temporarily out of stock
Siemens ALPHA Plug
  • RS Stock No. 627-121
  • Mfr. Part No. 8GK9910-0KK06
1 Pack of 50
HK$207.30
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-190
  • Mfr. Part No. 3VA2125-8JQ42-0AA0
Each
HK$22,607.20
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 3 channels
  • RS Stock No. 157-189
  • Mfr. Part No. 3VA2125-8JQ36-0AA0
Each
HK$19,592.90
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 40A 3VA2, 3 channels
  • RS Stock No. 157-419
  • Mfr. Part No. 3VA2140-8JQ36-0AA0
Each
HK$19,592.90
Temporarily out of stock
SENTRON Connecting Cable for use with TD500 - 3VA
  • RS Stock No. 263-746
  • Mfr. Part No. 3VA9977-0MY10
Each
HK$3,271.50
Temporarily out of stock
SENTRON Terminal for use with 3VA25 Series
  • RS Stock No. 263-895
  • Mfr. Part No. 3VA9603-0QE00
1 Kit
HK$1,973.50
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 3 channels
  • RS Stock No. 157-183
  • Mfr. Part No. 3VA2125-8JP32-0AA0
Each
HK$15,825.00
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