I use my Nexus tablet what has a touch screen which is a pain sometimes.
You should see it before I go back and clean it up. I'll go over it again.
Thanks.
I'll try to clean this up and repost it.
Why use the line side of the breaker as your power source? With the breaker in the on position the load side will be energized and capable of providing power to the ST circuit unless there is a reason to trip the breaker should it be in the off position. By supplying the ST circuit from the load side you will naturally have a way to disconnect power for the ST circuit if required which would be more difficult to do on the line side. Either way the ST actually trips the breaker and the breaker needs to latched, reset and then closed.
You next concern is "tapping" for power. You simply cannot just slip the wire underneath the existing terminals as the terminals must be listed for it.
Then you must fuse both line conducters. 208v is somewhat of a high voltage for control and you need to fuse the 2 line conductors. Is 208v is appropriate? 120v or even 24 or 12v should be considered when that circuit leaves the breaker enlosure to a remote location.
If you elect to do this you need to supply power to a properly sized CPT with a 208 fused primary. You would then fuse one line of the secondary grounding the other line to supply the shunt trip circuit.
Remember that a 208v 3ph supply is normally a Wye where you would have 120v L-N. If available at the breaker that could give you a 120v souce which would commonly require you to use only one fuse for the line conductor.
Of course the ST voltage should be the same as the control voltage depending upon what you chose.
Remember if you elect to go with the 208v there will be 120v from each line to ground also. Depending upon what remote location the ST is activated from and the length of your control circuit is this a safe voltage where a lower voltage would be more appropriate.
This may be a long reply but other things may also need some consideration. I always try to avoid providing an answer that may be like handing someone a loaded gun.
I trust that I have caught all of my errors this time.