Review on Contactor Pole Voltage for Packard C240B by Michael Morgan

I used this to build a smart water heater timer/controller. I had an old mechanical water heater with a timer that broke down after years of reliable service. I wanted to add a smart controller but there doesn't seem to be one ready for that purpose. I decided to try one of these smart relay switches to control a contactor that controls power to the water heater. I installed a smart relay switch, 220V 40A contactor with 110V coil and terminal block in the same box that the old mechanical timer was in and it works like a charm. I can now add timers with the smart app and use Revain's voice control with Echo to turn the water on and off. It would be nice if someone made one of these complete and ready to install. But it's nice that I was able to build this for less than $35. That's about half the cost of replacing a mechanical timer, and I don't know how to intelligently manage that.