sigshane
Member
- Location
- Elberton, GA USA
Hello folks. I am working through the DC control print for our generator output circuit breakers. Now, I have heard many people say they "know", or "think", but I want absolute, documented information on "a", "b", but especially "aa", "bb", and "ab" contacts, concerning circuit breaker main contact movement and/or position.
I know what a and b are. a should match the main contacts, and b should be opposite them. But what about aa? bb? What do they do exactly?
The tossed around 'knowledge' here about "ab" is they are closed when the main contacts are between open and closed states, which makes sense, since they are used in a breaker failure circuit here.
What I need is a solid reference to these contacts; I have Google'd them, but have come up short.
Thanks in advance,
Shane
I know what a and b are. a should match the main contacts, and b should be opposite them. But what about aa? bb? What do they do exactly?
The tossed around 'knowledge' here about "ab" is they are closed when the main contacts are between open and closed states, which makes sense, since they are used in a breaker failure circuit here.
What I need is a solid reference to these contacts; I have Google'd them, but have come up short.
Thanks in advance,
Shane