Questions tagged [automatic-circuit-breaker]

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2answers
48 views

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 ...
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2answers
90 views

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 ...
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1answer
75 views

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 ...
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5answers
189 views

Need a switch/circuit breaker that stops power supply to equipment when power comes back after outage [duplicate]

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 ...
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2answers
431 views

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, ...
3
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2answers
2k views

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&...
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1answer
67 views

Car electronics

I have a vehicle with a 150 amp alternator and inverter 450w 12vdc input 115 back output I want to run a tv for at least 4 hours TV is ac 110 60hz 48w typical power 28w I calculated my amps 0.4363636 ?...
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1answer
1k views

how to trip a MCB without short circuit or over load?

I want trip a MCB whenever I want to trip using some ckt.I have found that there is two mechanism by which mcb trip: 1)Bi Metallica expansion 2)Solenoid effect. So i think of controlling the solenoid ...
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2answers
702 views

Using motor circuit breaker buttons to start/stop motor

I want to add some protection to an ac 3/4 hp motor. I did some research and found that I could use one of these motor circuit breakers: My question is, if I use one of these, can I use the on/off ...
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1answer
334 views

Circuit breaker not tripping

I am powering a bunch of LEDs with a 60A/5V power supply. For extra protection, I wired a 50A circuit breaker between the supply and the LED array: http://www.digikey.com/product-search/en?mpart=W23-...
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2answers
3k views

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 ...
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1answer
132 views

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 ...
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2answers
86 views

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 ...
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2answers
414 views

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 ...