Description
MCB Terminology
EN 60898 Standard refers to the following terms:
Short Circuit Capacity
Rated Short Circuit Capacity, Icn
The calculated prospective fault current at the incoming terminals of the circuit breaker should
not exceed the stated value. For example: Icn = 10kA (marked 10000).
Service Short Circuit Breaking Capacity, Ics
This value is the maximum level of fault current operation, after which further service of the
device is assured without loss of performance. Note that there is no requirement for Ics to be
marked on the device.
There is a proscribed relationship between Ics and Icn, as follows:
For values of Icn up to 6000A Ics = Icn
For values of Icn 6000A to 10000A Ics = 0.75Icn (but with a minimum value
of Ics = 6000A)
For values of Icn above 10000A Ics = 0.5Icn (but with a minimum value
of Ics = 7500A)
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