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

126 of 999+
Temporarily out of stock
SENTRON Wire Connector for use with 3VA61/62 Series
  • RS Stock No. 263-594
  • Mfr. Part No. 3VA9143-0JK11
1 Kit
HK$983.50
Temporarily out of stock
Siemens SENTRON Terminal for use with Circuit Breaker 3WL10 / 3VA27
  • RS Stock No. 266-568
  • Mfr. Part No. 3VW9011-0AL74
Each
HK$3,582.60
Temporarily out of stock
Better World
Siemens SENTRON for use with 3VA1 and 3VA20 up → 3VA25
  • RS Stock No. 210-9429
  • Mfr. Part No. 3VA9988-0BL32
Each
HK$703.90
Temporarily out of stock
SENTRON Terminal for use with 3VA52 Series
  • RS Stock No. 263-869
  • Mfr. Part No. 3VA9231-0QF20
Each
HK$243.10
Temporarily out of stock
Siemens SENTRON Adapter for use with Circuit Breaker 3VA1
  • RS Stock No. 272-0209
  • Mfr. Part No. 3VA9187-0SH20
Each
HK$409.60
In Stock
Better World
Siemens 5SV3 RCCB, 40A, 4 Pole, 300mA, Type A
  • RS Stock No. 124-7742
  • Mfr. Part No. 5SV3644-6KK12
Each
HK$1,169.30
Temporarily out of stock
Siemens SENTRON Withdrawable Unit for use with Circuit Breaker
  • RS Stock No. 157-788
  • Mfr. Part No. 3VA9123-0KD10
Each
HK$1,014.40
Temporarily out of stock
SENTRON Cover Frame for use with 3VA61/62 Series
  • RS Stock No. 263-708
  • Mfr. Part No. 3VA9233-0SB30
Each
HK$309.30
Temporarily out of stock
Siemens SENTRON Interlock for use with 3VA5 250
  • RS Stock No. 272-0210
  • Mfr. Part No. 3VA9237-0LF10
Each
HK$685.60
Temporarily out of stock
SENTRON Auxiliary Contact for use with 3VA Withdrawable Units
  • RS Stock No. 263-856
  • Mfr. Part No. 3VA9977-0KD80
1 Kit
HK$276.50
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA12
  • RS Stock No. 153-379
  • Mfr. Part No. 3VA9253-0JC13
Each
HK$686.60
Temporarily out of stock
SENTRON Terminal Cover for use with 3VA55, 3VA65 Series
  • RS Stock No. 263-613
  • Mfr. Part No. 3VA9671-0WE30
Each
HK$760.80
Temporarily out of stock
Siemens SENTRON Cover Frame for use with 3VA55/65/66
  • RS Stock No. 162-033
  • Mfr. Part No. 3VA9584-0SB20
Each
HK$723.70
In Stock
SIBA 5A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 783-3324
  • Mfr. Part No. 70-007-65/5A
Each (In a Pack of 10)
HK$5.89
Temporarily out of stock
Siemens SENTRON Undervoltage Release for use with 3VA4/5/6
  • RS Stock No. 157-826
  • Mfr. Part No. 3VA9978-0BB14
Each
HK$1,113.40
Temporarily out of stock
Siemens SENTRON Cover Frame for use with 3VA12, 3VA20/21/22
  • RS Stock No. 161-948
  • Mfr. Part No. 3VA9253-0SB20
Each
HK$264.20
Temporarily out of stock
Siemens SIRIUS Wiring Module
  • RS Stock No. 157-781
  • Mfr. Part No. 3RA2933-3FA00
Each
HK$110.10
In Stock
ETA Thermal Circuit Breaker - 3120-N 2 Pole 50 V DC, 240 V AC Voltage Rating, 8A Current Rating
  • RS Stock No. 210-2058
  • Mfr. Part No. 3120-N32F-H7T1-SGRD-8A
Each
HK$362.69
In Stock
Eaton 315A NH Fuse, NH03, 500V
  • RS Stock No. 703-8752
  • Mfr. Part No. 315NHG03B
Each
HK$104.90
Temporarily out of stock
SENTRON Plug In Unit for use with 3VA61/62 Series
  • RS Stock No. 263-766
  • Mfr. Part No. 3VA9144-0KP10
1 Kit
HK$1,360.80
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