Works as advertised, except it should have detailed instructions so one knows exactly how to use it. The symbol for the control contacts show a momentary contact which does not say weather it produces a steady state or just gets the timer running. In my case it was a relay contact staying closed while the circuits were energized but I did not know if that would start the timing cycle. Fortunately, it does not until the relay contact opens which is what I needed. Had it worked the other way I would have wasted my money.