https://www.amazon.com/FortrezZ-MIMOliteUS-Z-Wave-Multi-input-Contact/dp/B00B6RZ7MM

or

https://www.amazon.com/Z-Wave-Plated-Reliability-Garage-TILT-ZWAVE2-5-ECO/dp/B01MRZB0NT

or

https://www.amazon.com/Z-Wave-Window-Sensor-Nexia-Included/dp/B008Q5CTBE

​

and, if you need to convert voltages: grab a suitable relay in a box from https://www.functionaldevices.com/products/building-automation/relays/.

There's also Arduino modules that convert 24VAC to 5V or 3.3VDC output signals, and you can probably easily find power supplies that can convert 24VAC to 5V DC.

​

I have never used *any* of these devices.