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A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by an overcurrent or short circuit. Its basic function is to interrupt current flow to protect equipment and to prevent the risk of fire. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
Circuit breakers are made in varying sizes, from small devices that protect low-current circuits or individual household appliances, to large switchgear designed to protect high voltage circuits feeding an entire city. The generic function of a circuit breaker, or fuse, as an automatic means of removing power from a faulty system, is often abbreviated as OCPD (Over Current Protection Device).

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  1. D

    Cold sunroom, need separate heating thermostat?

    I was wondering if anyone would have any advice on our cold sunroom. Basically the room is the coldest in the house. It is off the kitchen and separated by two double doors. However, we barely use it during the winter because of how cold it gets. There's a long double radiator in the room...
  2. D

    Wood burner back boiler gravity circuit problem

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  3. C

    Worcester Greenstar 37CDi Combi Boiler - air lock in primary circuit?

    Hi I am new to this forum. I am having difficulty with my boiler (details above). It makes a loud buzzing noise that builds in intensity before suddenly stopping. It appears to be random in occurrence and having been next to the machine when it did this the noise appears to be coming from within...
    • CRHF
    • Thread
    • air air lock appears boiler circuit combi combi boiler greenstar having might noise oil primary worcester
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  4. V

    Ideal HE30 L-F fault

    Hi, I have an Ideal HE30 which is displaying the L-F fault. I have measured only 110v dc at the gas valve(instead of 200v i believe) and there is no voltage going to the igniter module except for near the end of the sequence when 200v flashes up for about a second. The boiler goes through its...
  5. K

    Wet underfloor heating problem

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  6. H

    Central heating puzzle - underfloor heating circuit.

    I'd like to try and get a better handle on what is ailing our central heating system. The problem is with the underfloor heating circuit. The main system is a heat only Ideal Mexico HE30, with conventional expansion tank and hot water cylinder. It serves a hot water circuit, the house rads and...
    • HowardML
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    • Forum: Plumbing Jobs | The Job-board
  7. J

    Replace circuit board with modified board?

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  8. B

    Second pump on circuit

    Having issues with 2 large designer rads i fitted taking a long time to heat up,did explain this to the custy from the word go but they want to know can anything be done,pipework is 15mm,fed off 22mm,Rads are proving to be too restrictive for the pump,too much resistance to get round,never done...
  9. M

    Boiler circuit pressure?

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  10. P

    Draining rad circuit in reverse maisonette

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  11. W

    central heating

    good morning, if a radiator is removed from the system permanently,is it best to replace with tubing. so circuit is not broken ??
  12. S

    Hot feed pipe but cold return.

    Firstly hello to the forum, I am a DIYer so I will apologise for that first! I will start from the beginning! I recently done some work on my bathroom, when I removed the bath panel I found the hot water coil feed and return running around the bath behind the panel. In my haste to get on, I...
  13. B

    How to isolate hot water circuit from boiler?

    Hi how can I temporarily isolate the hot water flow from a Combi, so that I can perform maintenance on a tap that has no service valve leading up to it?
  14. J

    Radiator installed below single pipe circuit - will it work?

    Hello Does anyone know if a radiator/towel rail will work on a single pipe system if it is installed below the pipe work? I.e. if the pipe work is higher than the top of the radiator.
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  15. A

    Wiring for dual circuit and pump overun?

    Hi all. First post - be gentle. I have added major extension to existing house. There are two pumps each supplying a separate CH and HW zone valves. The boiler is a Worchester CDi conventional. The boiler has an overun circuit that keeps the pumps runing for 3 min after the Heating demand...
  16. U

    Heating circuit collecting heat from fireplace

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  17. T

    Shower pump wiring

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  18. L

    upgrading my W plan system

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  19. C

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  20. C

    Anti-return or check valves on secondary circuit

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