Siemens UL 508A Podręcznik referencyjny - Strona 17

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4.1 SB4.2 – Determining the short-circuit current ratings (SCCR) of individual power circuit components

Example

The following example shows a circuit breaker according to UL489 in a feeder circuit and a

tested combination according to UL508 Type F. The circuit breaker has been tested and

approved for 100 kA and the self protected combination motor controller per UL 508 Type E

has also been tested and approved for 65 kA.

The combination shown below complies with 65 kA according to the UL rules.

Figure 4-8

Short-circuit current rating (SCCR) of industrial control panels

Reference Manual, 06/2013, A5E31896849002A/RS-AA/001

Example combination

Basic steps for calculating the SCCR of a control panel