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Mechanism of Master-pact ACB!!? 1

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albarkani

Electrical
Joined
Jan 18, 2009
Messages
13
Location
SA
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 (micro logic 2.0a) but i thought it could be better to have some comments from you.

2- is about the quality of master pact breakers in general?

Regards.

 
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 trip! what is the case??
 
You have a problem that needs an experienced field person to examine.
As I said before, the C/B is designed to be both in the charged state and be closed at the same time. This is a normal condition.
The condition you describe, a closed C/B which opens upon charging, is not normal.
 
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