'Selling Sunset' Christine Quinn Aiming for Extra Protection Against Husband

Christine Quinn isn't sitting on the sidelines amid her husband's arrest for alleged assault with a deadly weapon -- she's going on the offensive and gearing up to ask for further protection ... TMZ has learned.

Sources with direct knowledge tell us the "Selling Sunset" star is actively speaking with attorneys right now -- as we're told she's prepared to lay out her history with Christian Dumontet ... something our sources say has been up-and-down through their marriage.

We're told that before she even entertains what to do with her marriage -- including the possibility of considering divorce -- protecting her and her son is her top priority right now ... which is why our sources say she wants a restraining order.

We're told Christine seems primed to make further allegations against Christian -- which is why she's meeting with lawyers ... because we're told there's lots to detail about what she claims went on behind closed doors, even before the incident that went down on Tuesday.

Our sources do tell us that, for now, Christine and Christian's relationship feels irrevocably broken -- but until a divorce filing is in ... you never know what might happen. All we know is that Christine is dead-set on getting an additional legal forcefield around her ASAP.

As we reported ... the emergency protective order provided to her by police lapses in 7 days -- so by Wednesday, Christine will need to file for a TRO if she wants additional legal protection.

Christian, of course, was arrested twice in 2 days this week stemming from an alleged incident that cops say involved him throwing a sack with glass at her .. and hitting their kid.