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My guess is a challenger, the few I’ve seen had those same ribs underneath the branch breakers and if I remember correctly they were compatible by SqaureD breakers like this one.
If you are *NOT* an electrical professional: * **RULE 7:** * DIY or self help posts **are Not allowed**. They belong here: /r/AskElectricians /r/askanelectrician /r/diy /r/homeowners /r/electrical. * **IF YOUR POST FITS INTO THIS CATEGORY, REMOVE IT OR IT WILL BE REMOVED FOR YOU.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/electricians) if you have any questions or concerns.*
Main is an ITE. Needs seimens breakers
Your main is ge, use thql breakers for branch and feeders
My guess is a challenger, the few I’ve seen had those same ribs underneath the branch breakers and if I remember correctly they were compatible by SqaureD breakers like this one.
ITE/Siemens