160A breaker question?

[Ross1]

Can somebody tell me why on the 3 phase circuit breaker in question has a 160A rating on the supply side and on the bus bar side it says 100A.

The breaker is an old GE RECORD, it also has a red button on the bus bar side of breaker. Is anybody familiar with the breaker I am explaining.

Cheers

 

[snowhead]

There's no problem with breaker being overrated as long as the protection matches the lowest rated (bus bar)

 

[Ross1]

Can you pls explain snowhead, as I've got a situation where a couple of these breakers will not protect the cables at these current ratings.

 

[Engineer54]

Can somebody tell me why on the 3 phase circuit breaker in question has a 160A rating on the supply side and on the bus bar side it says 100A.

The breaker is an old GE RECORD, it also has a red button on the bus bar side of breaker. Is anybody familiar with the breaker I am explaining.

Cheers

I am in no-way familiar with GE beakers, but by your description, this breaker is a MCCB rather than a MCB. As such i would think the 160A marking relates to this MCCB's ''Frame'' size, (MCCB's come in physical frame sizes) ...and the 100A is relating to it's actual current rating size. I have no idea what the function of the red button is on this unit, maybe it's a quick release?? lol!! I'm sure others here have a working knowledge of GE MCCB breakers...

 

[Darkwood]

http://www.geindustrial.com/india/brochures/Record_SL_Catalog.pdf

As ENG54 suggests your probably looking at the frame rating but this size frame covers all ranges from 16amp to 160amp... check out the pdf it might not be the exact range but gives a general idea.

 

[Ross1]

Thanks darkwood I`ll have a look in a min