3-Pole Circuit Breaker with GPIO
"...  that big red button that stays on when pressed." 


You want the button to stay latched when pressed and the circuit to remain off. I think that's what you meant to say but your wording shows muddy thinking which is never a good thing when designing a safety circuit.


  I want to hook the stop button with the circuit breakers so all the circuit breakers are open(tripped?) when pressed.


Machinery safety circuits are not designed this way. What you are proposing is that you require a trip coil to work when an e-stop command is given. If the coil or wiring fails you have lost your safety. Instead depending on the classification of the safety risk one or two sets of relay / contactor contacts should be wired in series with each motor so that when the e-stop is pressed that power is removed from the coil and the relays drop out making the circuit safe. This is basic fail-safe design (and yours is not).

The e-stop button should be monitored by a safety relay with a separate reset circuit with button in series with a normally-closed contact of each contactor checking that the contactors all dropped out.

I wrote a detailed explanation of the workings of a safety relay in my answer to Symbol or marking on safety relay.

Be very, very careful.