Law enforcement sources tell us Christian Dumontet was taken into custody again Wednesday night after cops say he arrived at his and Christine's house in the Hollywood Hills ... which spurred a 911 call and landed Christian in handcuffs for the 2nd day in a row.

We're told he was hauled away by officers and taken to jail, where he was booked on a charge of violating an emergency protective order. Photos of cops on the scene last night show at least one police cruiser at Christine's home ... but not shots of Christian himself.

Unclear who called the cops -- but sources with direct knowledge tell us Christine wasn't the one to alert police to Christian's presence, and more importantly ... we're told she wasn't even at the property at all.

Our sources tell us she hasn't been back to the home since heading to the hospital with their kid -- and is currently in a safe location with the child. Regardless ... we're told Christian being at the property is a no-go based on the legal forcefield afforded to Christine.

Remember ... she was granted an emergency protective order that's in place for 7 days after what allegedly happened between her and Christian on Tuesday -- and if she wants additional protection, she'll have to file for a restraining order.

As we reported ... Christian stands accused of trying to get violent with Christine during an argument -- having allegedly thrown a bag full of glass at her, but missing and allegedly striking their 2-year-old son instead. 911 was called, and Christian was led away by police.

We're told Christian was released from jail early Thursday morning on bond. We've reached out to Christine's camp ... so far, no word back.