Thanks for confirming the breakers. So it looks like you have 230V available to your pool gear. Thanks for the pictures! OK I need to see what is going on inside the box and on the switch itself. Take a picture of the switch wiring so we can see how it is terminated. And on the pump label there is a little wiring diagram to the right that show how to wire your pump, it is missing parts on your first diagram.
It looks like you definitely are all two phase here but this picture is hiding the screw terminals. I just want to verify the wires coming from your breaker panel and then the wires going out to the pump.
So until you verify the back of the switch for me, it appears you have a typical 2 pole manual switch that is switching off both 15amp circuit feeds from the breaker panel to your pool pump. So your solution is to use either the ZigBee HA Metering Dual-Load 30A Controller or the Intermatic CA3750 Z-Wave Contactor Module which are both rated for outdoor use.