Relay Instantaneous Element
Relay Instantaneous Element
(OP)
Hi All,
I just want to clearup an issue I have being pondering for a little while.
Lets say you have a relay with the Instantaneous set at, say, 12000A for a CB rated at 1600A. Is it a situation where the Inst. picks up 12KA or higher, or is it at some value below 12KA?
Thanks
I just want to clearup an issue I have being pondering for a little while.
Lets say you have a relay with the Instantaneous set at, say, 12000A for a CB rated at 1600A. Is it a situation where the Inst. picks up 12KA or higher, or is it at some value below 12KA?
Thanks






RE: Relay Instantaneous Element
If you are talking about medium-voltage or high-voltage circuit breakers, the relay has no idea what the rating of the breaker is.
Generally, there will be a time overcurrent element in addition to the instantaneous.
David Castor
www.cvoes.com
RE: Relay Instantaneous Element
The time delay relay pickup is most likely set at 1600A or below, depending on what the breaker is feeding.