Answer / waqa ahmed

mcb
miniature circuit breaker
mccb
moulded cage circuit breaker
elcb
earth leakage circuit breaker

Answer / g.t.manikandan

MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit,Normally it is used where normal current is less than 100A,
MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition,Normally it is used where normal current is more than 100A.
RCCB is used to detect earth leakage fault.once there is a ground fault in the load side,current from phase will directly pass through earth and it will not return through netural through RCCB,that means one side current is going and not returning and hence beacuse of this difference in current RCCB will trip and it will safe guard the other circuits for fault loads,that why cost of RCCB also costly

Answer / dixit

mcb
is a circuit protecting device which has a definite current rating which protects selective rating of the MCB which we choose.

MCCB
is also a circuit protective device we can change minimum to maxium value of current rating which can select .

ELCB

which sens the leakage current if any in the circuit,and trip the circuit immediatly

what is the significance of KV & MVA rating of the transformer and how they are related.

8 Answers  

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what is MCCB?

8 Answers   NTPC,

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In an panel board if the outgoings are power plugs and motor equipments...what should we choose as the incomer of the of the panel board?? MCCB OR ISOLATOR?? Should we use ELCB protection??if so where??

2 Answers  

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Why capacitor is blow when I am starting motor ?

1 Answers  

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If the capacitor bank is installed in switchyard say 132/22kv then on LT side say 22kv/0.433kv is it necessary to install capacitor bank for maintaining power factor. if pf is maintained on HT side then will that be maintained on LT side as well.if not then how&why??????/ please explain...........

3 Answers   MacLellan,

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why generaotr rating is in kva and dc motor in kw?

7 Answers   Bhel, NTPC,

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what is the principle of operation of domestic fan?? what is the role of capacitor in it??

5 Answers  

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why we use 50 hz frequency in india .. why not 60 hz 

3 Answers  

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what are the electrical components required for run the motor pump including safety components plz explain it how we can use such components .

2 Answers  

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why pull the single core cable?

1 Answers  

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please send me privious exam's queation papers of section engineer(electrical).

0 Answers   RRB,

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What is OT in a transformer, specify its function.

2 Answers  

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