I am looking to upgrade my outdoor main panel to a Square D QO panel. However, this outdoor 200A load center feeds my indoor 200A load center, and it does so not by using any of the breaker spaces but instead the bolt on piece at the bottom.
What is this called, and are they made for Square D QO panels such that I could upgrade it?
The part I'm asking about is in the dashed red rectangle. It passes the full current on the bus bar to the indoor panel.
Edit
There seems to be some questions about the neutral/ground bonding in this main panel, it is indeed bonded behind the main breaker in this panel. The Meter neutral comes in on the left, the sub panel is getting its neutral (insulated white) and ground (twisted aluminum) bonded on the right. This all checks out to me, so perhaps this diagram helps clear the situation up?
Best Answer
This is call a FEED THROUGH LUG and it's used for exactly what you have. Feeding from one panel to the next.
Yes, they seem to be available for SOME Square D QO panels but you'll need to check by the model number.