Secondary panel feeder

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Alexal

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Location
Israel
Hi, I'll appreciate your help with this issue.
I'm designing a UL508a control panel, I have a 120vac control circuit with a few UL1077 MCBs and one 20a MCB UL489 that feeding secondary control panel. That secondary panel contains only control circuit, can I use UL1077 MCB or UL508 disconnect switch as a feeder (main disconnect)?
 
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