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dear dampac and dandel, what you said is correct without the bracket the breaker will trip free, but instead of that simply remove the under-voltage relay so that you can test the breaker. any how, assuming the bracket is installed and the breaker closed, but when re-charge the spring it will...

dandel and dpc, thanks alot threre is nothing wrong with the control wiring because today i remved the C.B out of the engine and find out this points: 1- i close the breaker, trying to recharge but get the same thing it open when i at the same time i,m charging the spring. 2- the spring used...

FreddyNurk, and all the breaker that we are using is having (shunt trip, undervoltage relay and closing coil.) see the line bellow http://web.schneiderelectric.bg/bgnew/downloads/ed/lv/masterpact.pdf In our operation, the spring charing motor should be charged after the closing of the...

genhead, you are right the motor only use to charge the sring mechanism but it open the breaker at the same time of recharging the spring, in other words it open the breaker before it finsh the recharging process. note that the control wiring is okay and the shunt trip, closing coil and...

raghun, i,m not wrong, thats the case with me , it opern the breaker in both cases manual or motorised. i have 4 breaker having the same issue, thats why i was asking about the quality of masterpact breakers.

dpc, yes you are right, but even if we need to re-charge the mechanism using the handle instead of motor, we cant do it while the engine online because it will trip the breaker and thats the problem. and we have many engines at site and its working in auto mode (SCADA operation) and we should...

Dear all, here we have another questions about the master pact breaker. I have 2 question 1- is about the spring charging motor the spring charging motor use to open the breaker while re-charging the mechanism from discharge position to charge position? I am planning to change the trip unit...

ZogZog, yes its as in finger

thank you very much to all of you. the problem has been solved by chaning new breaker, this issue was due to loose contact on phase 3 on the breaker it self. regards.

rbulsara, the other 2 genset are working normal without any problem. and nothing happen when we lockout this generator means every thing is working well with ot without this genset the problem is only involved with one genset thats all

Dear rbulsara, Regarding your questions: 1. this genset is connected in parrallel with 2 other gensets as per attached file (layout). meaning: a. each 3 generators are connected togather to one transformer b. each 2 transformers connected to gather to one switchgear c. each switch gear is...

Dear all Here is some information it may help you to comment We are working on power plant and the generators are connected in parallel to the transformers. However before close the C.B from the generator side the voltage is stable (equal 450 on each line) after closing the breaker the...

Dear Guys, I have Merlin Gerin Masterpact NW 2500A circuit breaker and the trip uint is micrologic 2.0A THE PROBLEM IS THAT: WHEN WE CLOSE THE CB ON THE GENERATOR IT GIVE US ZERO CURRENT ON PHASE 3 ?? any suggestion??