Rated short-time withstand current Icw of Circuit Breakers
Rated short-time withstand current Icw of Circuit Breakers
(OP)
Hi all,
I have a LV MCC with rating 3NPE ~50Hz 380V/TN-S 2850A 80kA 1s 176kA peak. The incoming protection Circuit Breaker will of course have a rated short-time withstand current Icw=80kA. My question is, can the vertical bus-bars and the outgoing groups protection Circuit Breakers have a rated short-time withstand current Icw < 80kA (for example 50 kA)?
I have a LV MCC with rating 3NPE ~50Hz 380V/TN-S 2850A 80kA 1s 176kA peak. The incoming protection Circuit Breaker will of course have a rated short-time withstand current Icw=80kA. My question is, can the vertical bus-bars and the outgoing groups protection Circuit Breakers have a rated short-time withstand current Icw < 80kA (for example 50 kA)?






RE: Rated short-time withstand current Icw of Circuit Breakers
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Rated short-time withstand current Icw of Circuit Breakers
RE: Rated short-time withstand current Icw of Circuit Breakers
The impedance of the supply conductors may reduce the ASCC or current limiting fuses may allow a lower rating.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Rated short-time withstand current Icw of Circuit Breakers
RE: Rated short-time withstand current Icw of Circuit Breakers
RE: Rated short-time withstand current Icw of Circuit Breakers
Bill
--------------------
"Why not the best?"
Jimmy Carter