But a UPS doesnt work kinda that way as internal protection is inside thats why they dont really worry about AIC ratings of there gear. FAULT STUDYS ARE NOT DONE .
This is why i am picky about terms.
AIC refers simply to a protective device (switches and breakers) contacts ability to safely operate and clear during a fault condition. There is no way that the term applies to devices like SCRs.
SCA is the amount of short circuit amps that the system can deliver. SCA sources include power companies, generators, UPS's, and motors.
SCCR is the short circuit current rating (also called withstand) it is the amount of SCA that can flow through equipment and conductors, while waiting for a protective device to operate.
So,
A UPS must have an overall line side SCCR based on the cabablity of its input circuitry (i.e. rectifiers). Simply looking at the AIC rating of the individual input side breakers or fuses is not suffcient. This input SCCR has nothing to do with the output rating of the device.
During a load side fault condition many large UPS's will have their static by-pass device operate specifically to provide a significant amount of SCA to the downstream fault in order to cause protective devices to operate. This means the bypass circuitry, including the output breakers, is intentionally exposed to SCA that is higher than that from the invertors.
UPS's bypass circuits should always be included in fault studies.