You need to get an electrician who knows what they’re doing, but you can do this with two separate devices.
First, you get a dumb “contactor” which is just an on/off relay that is spec’d to handle your 60 amp load. This relay will typically plug-in to 120 V.
Then you just plug it into any standard Z wave outlet which meets code for the area where you are plugging it in. (You will probably need it to be outside of the splash zone of your pool, but check with your local jurisdiction). you can even use a pocket socket if it matches the specs.
That’s pretty much all there is to it. you use zwave to control the outlet, and when the contactor has power it turns on your 60 amp circuit.
See the following discussion: