Differentiate between power relay and reverse power relay?

2 Answers   ABB, TVS,

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Why efficiency of generator is higher than motor at a particular load?

0 Answers  

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What are the main parts of VCB?

12 Answers  

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before transformer oil dielectric strenght tests are taken the oil should be allowed to settle to remove option 1 air bubbles 2 gasses 3 contamination 4 water

0 Answers  

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How much area a lightning arrestor can cover?

5 Answers  

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how technical is calculated in 11kv line and lt line

0 Answers  

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What is a thermocouple, and it working principle?

2 Answers  

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What is the actual calculation for transformer short circuit test?.

0 Answers  

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if we convert kw into kva,which one formula use by us,pls tell me?

19 Answers   ABB, AEC, BGH,

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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

0 Answers   Siemens,

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What is the result of under frequency to the system.

4 Answers  

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how calculation to be done of cable size/o.h. conductor size of 11kv h.t.for the load of 2175 kw

1 Answers   Shell,

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