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fuse

In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device; once a fuse has operated it is an open circuit, and must be replaced or rewired, depending on its type.
Fuses have been used as essential safety devices from the early days of electrical engineering. Today there are thousands of different fuse designs which have specific current and voltage ratings, breaking capacity, and response times, depending on the application. The time and current operating characteristics of fuses are chosen to provide adequate protection without needless interruption. Wiring regulations usually define a maximum fuse current rating for particular circuits. Short circuits, overloading, mismatched loads, or device failure are the prime or some of the reasons for fuse operation. When a damaged live wire makes contact with a metal case that is connected to ground, a short circuit will form and the fuse will melt.
A fuse is an automatic means of removing power from a faulty system; often abbreviated to ADS (Automatic Disconnection of Supply). Circuit breakers can be used as an alternative to fuses, but have significantly different characteristics.

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  1. C

    Vaillant boiler 2a fuse trip

    Hi all We have a Vaillant turbomax plus 828e combi which we found powered off a few days ago. Turns out the 2a glass fuse on the PCB had gone. Replaced and it turns back on but as soon as you start the hot water or heating, it pops again within a few seconds I have looked as the pump and can...
  2. D

    Internal fuse potterton assure 30 boiler

    Hi, My boiler, which is 3 years old, has stopped working and it turns out it was the fuse. I had an engineer resolve the issue, but when I turned the boiler off then back on it stopped working. The fuse that was used was anF2AL250V, that's .2A Should it have been an F2AH....? Also, is it 2A...
  3. S

    Main Boiler circuit fuse blowing.

    This morning woke up to no central heating, but the hot water had been on earlier in the morning. I checked the programmer and it was indicating CH was on. Went to the room thermostat and it didnt click when rotated, but then started clicking without any input. I had a spare room thermostat...
  4. M

    How to fix power connector to boiler?

    Hey. Got home from Christmas with family to find boiler isn't working, no lights on anywhere. Boiler itself is old but ok. There has been a leak from an upstairs flat and the grey square connector in picture is very wet. Nothing has tripped on main board...I'm guessing either the connector...
  5. S

    Potterton Gold H blowing spur fuse

    Hi Guys, Need some help. Potterton Gold H keeps blowing the spur fuse when running ether hot water or heating. System is a Y plan and 3 port valve has recently been replaced however issue has been ongoing customer has said for past 2 years. Fuse blows within few minutes of running hw or ch...
  6. H

    Called out to fault on Alpha HE 33. New Fan Installed.

    Hi guys. First post on here. Called out to fault on Alpha HE 33. Fast blow fuse found to have blown. Faulty fan found to be problem. New fan installed and tested. Four days later and a call from customer to say boiler not working again. fast blow fuse found to have gone again. Replaced and gone...
  7. S

    Mains Pressure Tap above Consumer Units OK? UK Law *See Photo*

    I would like a professional plumber's advice on this attached image, which shows a mains pressure pipe with tap located above the consumer units. Is this ok for the legal requirements in the UK? Can someone let me know what the law is on this matter please? have a link? Thanks all.
    • spinner121
    • Thread
    • above america consumer fuse law mains photo pressure tap units usa
    • Replies: 5
    • Forum: USA
  8. D

    Boiler keeps tripping main fuse

    I have a grant vortex combi and it keeps tripping the main fuse when the programmer calls for heating. This has just started, it was working fine before. Anybody got any thoughts
    • Derek P
    • Thread
    • america boiler fuse keeps main tripping usa
    • Replies: 17
    • Forum: USA
  9. I

    Shower pump blowing fuse

    Hi all, I have a Salamander CT30 shower pump that was installed by a plumber in October 2019 and the other day it would not start. I checked the fuse first and it was blown so I replaced it. The second the power was switched on the pump started, (or sounded likeit did) but instantly blew the...
    • itsmehere
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  10. G

    Cooker igniter at risk or if?

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  11. J

    2amp boiler fuse inside keeps blowing

    Recently bought a house and boiler was working fine. Now wont turn on so opened up and saw the 2amp fuse looked like it had blown. So replaced with another 2amp fuse and it keeps blowing that fuse instantly. Any ideas? Im on the verge of moving into it with my family and we have ran out of money...
  12. AMGasServices

    S plan blowing fuse any ideas

    Hi, A friend has s plan system, unvented how water tank, ideal logic heat only boiler and potterton programmer (was changed with like for like about 6 months ago). It keeps blowing the 3a fuse in the fuse spur. Boilers been turned off at the front of the boiler (the control knob) and issue...
  13. J

    Internal fuse keeps blowing when i connect HW zone i to my wiring centre!

    I have wired an s plan plus system. Consists of 2 hot water 2 port valves and one central heating 2 port valve. The boiler is a worcester bosch cd classic. Problem began when i turned the boiler on first time and nothing happened! Found that the internal 2.5A slow blow fuse had blown...
    • John Smiley
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  14. I

    Thermal fuse GW ultracom 2 cxi

    Thermal fuse blown in the above boiler. No part number for it as it Comes complete with the hex. The warranty is 5 months out of date, not sure if gw will entertain this one when I call group service tomorrow. Can anyone suggest anything....a heating company is selling them on eBay and state...
  15. SlimD

    Remeha Avanta 18v fuse holder

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  16. Inverness

    Fuse 13amp but states 5amp

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  17. Inverness

    Boiler trips the fuse

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  18. K

    Wood pellets (......)

    Please no advertising without prior approval Many thanks
  19. N

    Fuse blowing on Altech/JG Speedfit underfloor heating system

    Hello, I have a wireless underfloor system controlled by altech receivers and transmitters. There is also a JG speedfit control board and distribution board. As soon as the transmitter connects to the receiver, a green light turns on and the actuator valves on a manifold attempt to turn on. As...
    • Nikita
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    • Forum: Plumbing Jobs | The Job-board
  20. W

    Unvented cylinder fuse blown?

    Hello, A couple of weeks ago I called out a plumber to change a thermostat since the bottom one (Economy 7) wasn't working. Unfortunately the change hasn't worked and since then (due to cost of calling in the plumber again to sort), I have been using the "Peak" switch for an hour a day to get...
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