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This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.

What is the Main function of UA or BA control units for Automatic transfer switch ATS using MCCB ?

The UA or BA controllers are used to control the operation truth table for an automatic transfer switch system (1 out 2),

they provide all the scenarios of breakers "which CB will operate and which will be opened during different operational conditions"

This is to keep the trasfering function fully automated between the two CBs