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

170 of 999+
Temporarily out of stock
Siemens 710A Tag Fuse, 89mm, 900V
  • RS Stock No. 608-810
  • Mfr. Part No. 3NE6437
1 Pack of 3
HK$6,633.10
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 45A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-631
  • Mfr. Part No. 3VA5145-4ED41-0AA0
Each
HK$4,693.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 250A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 260-361
  • Mfr. Part No. 3VA6225-7HM41-2AA0
Each
HK$32,411.10
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 25A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-298
  • Mfr. Part No. 3VA5125-4EC41-0AA0
Each
HK$4,890.70
Temporarily out of stock
Siemens, SENTRON MCCB 3P 300A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 256-557
  • Mfr. Part No. 3VA5330-6EC31-2AA0
Each
HK$21,730.20
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 7 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-383
  • Mfr. Part No. 3VA5140-5EF41-0AA0
Each
HK$5,470.90
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 630A, Breaking Capacity 9 kA, Withdrawable
  • RS Stock No. 246-888
  • Mfr. Part No. 192276 NZMH3-PX630-TAZ-AVE
Each
HK$68,149.30
Temporarily out of stock
Eaton 35A NH Fuse, 58 x 30 x 135mm, 400V ac
  • RS Stock No. 261-564
  • Mfr. Part No. 35NHG01B-400
1 Pack of 3
HK$288.10
Temporarily out of stock
Siemens 450A Tag Fuse, 161mm, 1kV, 129.7mm
  • RS Stock No. 608-829
  • Mfr. Part No. 3NE3635-0C
1 Pack of 3
HK$7,141.00
Temporarily out of stock
Siemens 630A Tag Fuse, 123mm, 800V
  • RS Stock No. 608-768
  • Mfr. Part No. 3NC5841
1 Pack of 3
HK$13,571.30
Temporarily out of stock
Siemens, SENTRON MCCB 3P 300A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 257-364
  • Mfr. Part No. 3VA5330-6EC31-1AA0
Each
HK$20,072.80
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 4P 300A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 257-430
  • Mfr. Part No. 3VA5330-6GF41-0AA0
Each
HK$28,175.50
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 450A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 246-905
  • Mfr. Part No. 192330 NZMN3-PMX450-SVE
Each
HK$35,631.80
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 355A Tag Fuse, 54 x 150mm, 400V
  • RS Stock No. 261-560
  • Mfr. Part No. 355NHG03BI-400
1 Pack of 3
HK$649.00
Temporarily out of stock
Eaton 100A NH Fuse, 63 x 40 x 150mm, 400V ac
  • RS Stock No. 247-090
  • Mfr. Part No. 100NHG02BI-400
1 Pack of 3
HK$407.70
Temporarily out of stock
Siemens 200A Tag Fuse, 135mm, 600V
  • RS Stock No. 608-685
  • Mfr. Part No. 3NB1126-0KK10
1 Pack of 3
HK$4,467.40
Temporarily out of stock
Siemens 50A Tag Fuse, 137mm, 1kV, 106.6mm
  • RS Stock No. 608-802
  • Mfr. Part No. 3NE3217-0MK
1 Pack of 3
HK$2,074.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 600A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 249-890
  • Mfr. Part No. 3VA6460-6KP31-0AA0
Each
HK$47,907.60
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