Product review (5 stars): Had some doubts but it worked.
A previous reviewer explained that the relay arrived via USPS envelope stuffed with newspaper. So I was not surprised when mine arrived the same as well. There are no instructions just the relay. Instructions to install this relay are posted through various locations on the web. I noticed that this particular time delay relay has the Omron brand as opposed to the Zettler brand if that makes any difference. It is physically smaller than the original relay RLY02257 which has the electromagnetic relay attached to it. I believe the relay on this one is solid state. It is currently working on my Trane A/C unit and only time will tell if it reliable as the old one. The time delay is stated as being 80 seconds before turning on. I measured over 2 minutes before it activated the relay. Turning the relay off seemed longer than 2 minutes. The old relay lasted 16 years before being showing symptoms of being stuck on for the blower fan.