Siemens NEC Article 409 - Page 19

Basic steps for calculating the SCCR of a control panel
4.2 SB4.3 – Adaptation of the available short-circuit current rating based on the peak let-through currents when
using current-limiting devices in the feeder circuit
Short-circuit current rating (SCCR) of industrial control panels
Reference Manual, 06/2013, A5E31896849002A/RS-AA/001
19
The selected circuit breaker lets 22
kA
through at a short
-circuit of 100 kA.
⇒ In other words
, all components in the
branch circuit must be designed for at
least 22
kA. The control panel is suitable
for a maximum let
-through value of
100
kA.