1) Copy following links for illustrations showing timer controlling contactor in 3-phase environment:
http://waterheatertimer.org/How-to-install-3-phase-timer.htmlhttp://waterheatertimer.org/images/3-phase-timer-diagram-24Vac-865.jpg2) Substitute thermostat instead of timer for switching control.
3) I don't know what thermostat you have, or if it's functioning or the rating.
4) Which contactor do you have?
Do you have a 3-phase contactor??
Or two-pole single phase contactor?
5) Match thermostat output voltage with contactor voltage:
Thermostat output is 24 volt? Then use 24Volt coil on contactor.
Thermostat output 120 or 277 > then use contactor with same coil rating.
6) More information is needed.
I don't understand description of your wiring.
Add a comment and compare with illustrations sent, so I can visualize ... or attach photo and/or give product numbers so maybe I can locate wiring diagrams.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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