what is the difference between relay and a contactor.

5 Answers   Siemens,

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In power generator sets, when they are coverted from 50hz to 60hz, the kva rating after conversion increases. For example, the manufacturer of a perkins 200kva @ 50Hz generator set has mentioned it to become 220kva after converstion to 60hz. What is the relation between the frequency & the KVA rating. Any formula please.

3 Answers  

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WHAT IS THE ANALYSIS OF FREE WHEELING DIODE IN FULL WAVE CONROL RECTIFIER?

1 Answers  

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why magnet has north and south poles only why not east and west and why we are considering as north and south poles? why cant we consider as east and west?

0 Answers  

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What is the function of Buchholz relay in transformer ?

1 Answers  

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HOW CAN YOU CALCULATE PRACTICAL EFFICIENCY OF A ASYNCHRONOUS INDUCTIONMOTOR OF 7.5KW,& MOTOR IS RUNNING WITH AVOLTAGE OF 410 VOLTS,& TAKING CURENT OF 13 AMPS

0 Answers  

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Refernce currents are to be generated using refernce cueernts how can this be done??

0 Answers  

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we can conformed the vector group of the transformer. How?

0 Answers  

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Is MV canble armour can be earthed at both ends?

2 Answers  

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Why 50hz and 60hz frequencies are used by the world, why they are not taking 55hz?

3 Answers  

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Difference between SFU & FSU with advantantages & drawback?

1 Answers  

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

0 Answers  

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