logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Frequent Breaker Trips: Testing Differential and Fuse Blowouts with Iron Use

130880 41594 36
Best answers

Why do my apartment socket fuse and meter fuse trip when I test the RCD or use a 2100 W iron, and what should I check first?

The most likely cause is not the iron itself but a faulty power strip/surge protector or another load on that socket, so test the circuit with all strips unplugged and then reconnect devices one by one [#6585063][#6585125] The thread notes that the strips should not be connected in series, and a bad varistor in one strip can make the protection trip too early or even short the circuit [#6585063][#6585125] After disconnecting the computer from the power strip, the problem disappeared, which strongly points to the strip/PC side of the installation rather than the iron or the breakers themselves [#6590995] If the limiter/arrester actually shorts, the nearest protection will trip first, so the pre-meter fuse can go out together with the apartment fuse [#6599082] The remaining advice was to have an electrician check the installation because the circuit is not selective and there may also be a wiring or device fault [#6580584]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
| New topic
  • #31 6585125
    Darrieus
    Level 38  
    Posts: 3684
    Help: 406
    Rate: 287
    The strips should not be connected in series, I wouldn`t worry about the antenna, as something would blow the differential like a fuse.
  • ADVERTISEMENT
  • #32 6585859
    michcio
    Electrician specialist  
    Posts: 2595
    Help: 144
    Rate: 478
    lubamet wrote:
    That`s why at the beginning I didn`t think about securing N at all, especially since you have a PEN distribution for PE and N somewhere close to your house, but if you secure it, there is no threat.


    How "close" to the house is it to secure it. Unless the PEN section is in the same switchboard as the limiter. A few meters of cable from the distributor is of great importance.
  • ADVERTISEMENT
  • #33 6590995
    130880
    Level 10  
    Posts: 22
    Rate: 11
    I disconnected the computer from the power strip and the problem disappeared.

    Let`s assume that the limiter is damaged and begins to conduct electricity, should I use any additional protection?

    "Installation of overvoltage limiters in front of residual current circuit breakers str3"

    http://www.tech.co.bydgoszcz.pl/pdf/o3.pdf
  • #34 6599082
    michcio
    Electrician specialist  
    Posts: 2595
    Help: 144
    Rate: 478
    If the limiter short-circuits, the closest protection, in this case probably the pre-meter protection, will go out.
  • ADVERTISEMENT
  • #35 6599599
    anmarol
    Level 11  
    Posts: 16
    And why do you have overvoltage protection for a three-phase installation????
  • ADVERTISEMENT
  • #36 6600389
    Darrieus
    Level 38  
    Posts: 3684
    Help: 406
    Rate: 287
    If you read the whole topic, you would know that he had one lying around his house, so he used it, what difference does it make?

    Quote:
    Let`s assume that the limiter is damaged and begins to conduct electricity, should I use any additional protection?


    If it short-circuits, the varistor will turn into a piece of cake, the pre-meter will probably not fail, and if it fails, you have S and you can turn it on.

    Don`t think about anything anymore.
  • #37 6602033
    130880
    Level 10  
    Posts: 22
    Rate: 11
    Thank you all for your help, especially user lubamet!

    I`m closing the topic
| New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around a user's electrical installation issues, specifically frequent breaker trips and fuse blowouts when using high-power devices like an iron. The user has a 25A 30mA differential switch and 5 circuit breakers, with a 16A socket fuse and a 20A meter fuse. Problems arise when testing the differential or using the iron, leading to simultaneous fuse blowouts. Various responses suggest checking the type of fuses (B vs. C), potential overload from inductive loads, and the need for proper surge protection. The user is advised to disconnect devices, test circuits individually, and consider the condition of the meter fuse. The conversation also touches on the installation of surge protectors and the importance of proper wiring and fuse selection to prevent electrical hazards.
Generated by the language model.

FAQ

TL;DR: Up to 70 % of nuisance trips in small flats are caused by surge-bar or cord faults [Schneider, 2021]. “Selectivity fails when identical B-curve breakers sit in series” [Elektroda, Darrieus, post #6580584] Check strips first, then breaker curve mix.

Why it matters: Quick checks can stop double-fuse blowouts, protect appliances, and avoid paid call-outs.

Quick Facts

• B-curve MCBs trip at 3-5× In; C-curve at 5-10× In [IEC 60898]. • 2100 W iron ≈ 9.1 A at 230 V; within a 10 A fuse’s continuous rating. • Pre-meter reseal fee: PLN 30 ± 10 [Elektroda, Darrieus, post #6581086] • Recommended SPD cable size: ≥ link conductors, typically 4 mm² Cu [Moeller SPD Guide]. • Contracted power in thread: 4 kW, protected by C20 breaker [Elektroda, 6583880]

Why does my apartment blow both the room breaker and the pre-meter fuse when I press the RCD test?

All loads restart simultaneously after the RCD resets, creating an inrush that exceeds the identical B-curve trip levels of both breakers; without curve selectivity they open together [Elektroda, 130880, post #6580611][Elektroda, Darrieus, post #6580620]

Can a single 2100 W iron legitimately trip a 16 A socket breaker?

A hot iron draws about 9 A; that is only 56 % of a 16 A breaker’s rating. If it trips, the cause is usually cumulative inrush from other devices or a weak/faulty breaker [Elektroda, 130880, post #6580573]

Do I need type C breakers on socket circuits?

Use C-curve only when inductive or high-inrush loads (compressors, vacuum cleaners) share the line. For mixed electronics, B-curve remains standard; pre-meter protection should then be C for selectivity [IEC 60898][Elektroda, Darrieus, post #6580584]

What’s the fastest way to locate the real culprit?

  1. Unplug all surge strips and multi-plugs. 2. Re-energise circuit. 3. Add devices one by one until the breaker trips. In the thread, removing one power strip stopped all trips [Elektroda, 130880, post #6590995]

Could a buzzing breaker or fuse be the problem?

A mild ‘zzz’ often stems from the electromagnet vibrating inside low-quality MCBs; it’s annoying but not automatically faulty [Elektroda, Darrieus, post #6580692] Persistent buzz plus heat means replace the unit.

How do I wire a single-phase Moeller surge arrester correctly?

Connect phase to the L terminal (top), neutral to N (top or second slot), and PE to earth bar; keep leads as short as possible (<30 cm). The user’s final photo shows correct layout [Elektroda, 6581011]

What happens if the SPD fails short?

The SPD’s varistor turns into a near short; the closest upstream breaker—often the C-curve pre-meter device—opens within milliseconds, isolating the fault [Elektroda, michcio, post #6599082]

Is it safe to daisy-chain two surge strips?

No. Chain increases contact resistance and cumulative inrush. In the thread, two chained strips tripped breakers even under light load [Elektroda, Darrieus, post #6585125]

How much does it cost to legally replace a sealed pre-meter breaker in Poland?

Energy utility unsealing and resealing averages PLN 30; labour varies widely (PLN 50 – 150 typical) and no extra measurements are required for a straight swap [Elektroda, Darrieus, post #6581086]

Edge case: can a neutral-only fault trip the RCD without blowing fuses?

Yes. An N-PE fault induces 30 mA residual current needed for an RCD trip while line current stays below fuse limits. Always secure the N conductor when adding SPDs [Elektroda, michcio, post #6585859]
Generated by the language model.
ADVERTISEMENT