You're confusing me. Applying voltage to the shunt-trip coil causes the breaker to trip. That voltage needs to be momentary because you can burn up the shunt-trip coil. So whatever scheme you use to trip the breaker, the voltage cannot be sustained after the breaker trips hence the recommendation to use the breaker itself to supply the control voltage. But sometimes that's not possible with higher voltages.
I believe the wording on the label indicates that there are internal interlock contacts that disconnect the shunt-trip coil when the breaker trips or is in the off position. It's not an advisory to remove voltage when the breaker is tripped or off. So if you have to supply the shunt-trip coil with a constant voltage after the trip you are good to go, at least with that breaker.
Don't know if that's what you meant or not. Just trying to clear up any confusion.
-Hal