Product review (2 stars): worked for a while...
I bought this to control a 24v damper for an air supply.  It work fine initially but then it was in a "continuously closed" position when the 24v power was applied.  Testing with an ohmmeter while disconnected it shows open - so somehow there's leakage that is sufficient to allow the damper motor to operate.  Disappointed since I had to disassemble the Range Hood to get access to the relay and determine what the problem is.  Range hood is to a 12' ceiling so it's not an easy fix.  Time to figure out another solution I guess since I don't want to have the same problem happen again.