Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [automatic-circuit-breaker]

19 questions
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Are there breakers which can be triggered by an external signal and have to be reset by hand?

Essentially, I would like to connect a breaker to a smoke detector and have it trigger when it activates. Are there any breakers that can be triggered by a separate external signal and which have to be manually reset by hand?
Reewen
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Should a frequency-controlled motor use a circuit breaker with a B or C trip characteristic?

In our company, a discussion is raging on whether a motor with a frequency controller should be protected with an automatic circuit breaker with B or C characteristic. The B-camp's argument is that, because of frequency controllers or…
Bart
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What factors play into choosing type of MCB (Circuit Breaker) which is B16 vs C16 vs D16?

Found these discussions and Q&As online around this and am trying to determine how/ when one would decide to choose which way to go? http://www.theiet.org/forums/forum/messageview.cfm?catid=205&threadid=25220 Type B - trips between 3 and 5 time…
Alex S
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First order circuit with t=0+ , t=0-?

Yesterday I tried to solve a question in a second order circuit , but I couldn't ! because I have problem understanding the concept of 0+ , 0- ! So let me try it in a first order circuit , it supposed to be much easier : Is there any thing…
Hashim
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Finding some variables in a second-order circuit?

Can any one please help me solving these questions .. I always get a wrong answers :/ The first order circuit is much easier than this one !! This is my answer : for the first time i thought it will not be easy .. but after understanding the…
Hashim
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Is it normal to keep turning on RCCB multiple times until it stays up?

I have a breaker that controls current powering a set of seven desktop computers and monitors. Sometimes it can take me up to twenty attempts to bring the breaker up. Eventually it stays up and the system is functioning well and never ever trips the…
Tony Sepia
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Why do 3-phase selective circuit breakers appear as separate (not joined) ones?

I'm looking at 3-phase selective circuit breakers like this: Unlike a typical 3-phase circuit breaker, this selective breaker appears to be essentially 3 separate breakers all put together. Strangely enough, they are sold together but also sold…
Dmitri Nesteruk
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How does the arc extinguisher work in a miniature circuit breaker?

In a miniature circuit breaker, as shown below, the distance between open contacts is much less than the distance between metal bars in the arc extinguisher part (the gap gets progressively longer from contacts to arc extinguisher.) So why does…
Microsoft Linux TM
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Need help to identify this timer

This device is installed in our electrical panel which act as a timer to control the on/off operation for our LED billboard outside my office. I searched around the device for the brand and model it did not state anything or probably written in…
Ray Asda
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how phase frequency matches in reverse power flow situation

I have a question regarding smart energy systems. Consider a reverse power flow (where the power flows from household to grid) situation, A household has a solar installation and the energy obtained is given to the grid. So the power from solar has…
Bhargav Ravuri
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How to select a home automatic circuit breaker?

A room contains electrical devices which has a max demand of 10A (may be more than that in the future). The mains cable from the electric panel (distribution board) is 4 mm2 which can handle current up to 23A. The sub-cables from the main cable to…
Michael George
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Why are two 555 ICs used in this automatic plant watering system's circuit diagram?

I have been working on this project but couldn't figure out why two 555 ICs are used and how they contributed to the operation.
Shoeb Akter
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Can I replace a 32 A switch with a 32 A MCB?

A switch for a water heater in my apartment is broken (image attached). It is an "Anchor Roma 32 Amp 1-Way Switch with indicator". Can I replace it with this or this switch? Would the installation be similar or the same? Background: I am a software…
nosh
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How turn off lights automatically?

I am trying to make system where I want lights to turn off automatically. It should work like that if someone kept lights on by mistake then it should turn off automatically without any human intervention (like in IoT we can turn off with our phone…
Akshay Kamble
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Need a switch/circuit breaker that stops power supply to equipment when power comes back after outage

I need a switch that stops power supply(220VAC) to led tv when power comes back after outage. So i need a circuit breaker that breaks the circuit when power supply is off and needs manual switch on from this circuit breaker device when power supply…
Anshuman
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