logic of connecting RAC04-12DC/230 in certain way

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yef smith

Joined Aug 2, 2020
1,485
Hello, I need to use two type of the componens.
From the attached table I need to use RAC04-12DC/230 to get +-12 and RAC04-24SC/230 to get +24 signe ended.
RAC04-12DC/230 is dual mode from the photo below.
What is the meaning of COM at pin 3 shown in the photo below?
Thanks.
https://www.mouser.co.il/datasheet/2/468/RAC04-C_230-1711174.pdf
 

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