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Topic :: Circuit Breaker





Circuit Breaker Interview Questions
Questions Answers Views Company eMail

how we select the mva rating of the circuit breakers?

1 3891

The MCB circuit breaker have a voltage rating of 440VAC it's possible to supply a voltage of 480Vac

1 3588

A circuit breaker is a

9 8993

in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.

1879

what is difference between vaccum circuit breaker and air circuit breaker?

2 5938

what is the safety points of vaccum circuit breaker.

2089

Advantages of using generator circuit breaker (GCB) scheme in a power station ?

Gridco,

5281

How Many safety of Air circuit breaker

2 5224

How will A Medium voltage circuit breaker(11 kV voltage level) operate under short circuit fault condition whether It is having short circuit release like Low voltage circuit breaker or relay should be given?

1945

What is the function of the circuit breaker failure relay?

2377

What is the criteria in selecting Air circuit breaker(ACB) & Moulded case circuit breaker(MCCB) for a particular range?

DLF,

3 8368

What is SF6 Circuit Breaker?

Amdocs,

2 5245

why we use circuit breakers for switching instead of normal switching device?

1876

What are the tests to be done on circuit breaker?

1 3975

what are the stresses in circuit breakers ?

2020




Un-Answered Questions { Circuit Breaker }

Can anyone please give me the parameters , formula needed to calculate the circuit breakers for building services.Thanks

2139


what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?

1928


how circuit breaker work.. what is the operations taking place inside a circuit breaker when an overcurrent occurs... is it similar to fuse?

2069


what is circuit recombiner and how it is different from circuit breaker

1885


If a surge divertor is required to be protected by 32 amp C Curve Circuit breaker does this limit the amount of protection from surges that you will acheive

1796


How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.

1732


Merits & Demarits of Oil circuit & Air circuit breakers ?

2080


What is Surge Capacitor? Why it is use in Generator Circuit Breaker?

5139


What is Surge Capacitor? Why it is require in Generator Circuit Breaker,inspite of surge arrester?

3132


how braking & making capacity of circuit breaker is calculated?

2005


how braking & making capacity of circuit breaker are calculated?

2303


When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

2155


LET ME NOW MORE ABOUT icu and ics for circuit breaker. how we calculate the rating of circuit breaker and i c u and ics values

2874


What is the formula to calculate the rating of a three phase miniature circuit breaker

2144


What is the formula to calculate the rating of a three phase air circuit breaker

2324