Intermatic ET8215C Astronomic Electronic Time Switch - Automated Weekly Scheduling, Multi-Volt Operation, To-the-Minute Programming - Astronomic Feature for Intelligent Lighting

Best design of an electronic timer. Never have to reset the timer with the time change as it automatically changes by itself. After entering the date, time, and location, the timer has the time of sun rise and sun set programmed in its memory, so you don't have to keep changing the time every few months. Intermatic is a heavy-duty timer with NEMA 1 and NEMA 3R boxes to choose from. I only wish they offered two AAA lithium batteries for memory battery backup. I always install energizer lithium for areas prone to power outages, so the timer keeps its date and time.

We had 3 different lighting circuits controlled by 3 different manually-adjusted Intermatic time clocks. It was not only a pain to have to reset the on/off times for each clock several times a year, it also wasted electricity because the lights would often be on longer than necessary. These new Astronomic clocks are the PERFECT solution for us! Needed an electrician to install them (had hoped I could simply replace old with new but wiring was different) and programming took some time to figure out but we got it and I haven’t even thought about the clocks since we had them installed.

I replaced a mechanical Intermatic timer with this model, only for the additional astronomic function. First of all, it works beautifully and it's easy to program. The reason for 4 stars instead of 5 is that it's not really plug and play. I'm handy but not an electrician. I had to fully dismount the old box - you cannot simply exchange the mechanical mechanism for this digital one. You have to add a jumper between two of the poles to get it to work with standard 110V lighting. Again, this might have been really obvious to a licensed electrician but to the weekend warrior like myself, it wasn't. With some fiddling around, I got it working. Total install time was about 90 minutes (due to the uninstall and fiddling with the jumper). Once I got it running, it was fantastic. The price is somewhat outrageous, but not having to constantly mess with the start and stop times to match the changing times of dawn and dusk is well worth it.

I now have a few of these Intermatic astronomic timers, on some lighting as well as a solar water heater control. They work perfectly and have pretty good versatility in terms of programming. Never have to change the on and off times as the seasons change since it knows when sunrise and sunset are. To me they are expensive but the best or only choice I could find to fit the application. I'm surprised they haven't figured out how to make an app-driven configuration setup, which might be easier than the on-screen arrangement. You probably need some basic electrical skills to understand which model you need and how to wire it, for 120/240, single or double pole, etc. Recommend these if you want the astronomic control feature.

This is the second of this product bought to replace some "dumb" timer switches used at our church. We now have the flexibility to have the outside lights on at the unique times our church schedule requires. Especially like the fact that it tracks sunset and sunrise times as well as changes in daylight savings time. We now have the lights coming on when needed, and not coming on in broad daylight because of changes in time or the variation in sunset and sunrise times during the year. Further, the battery back-up avoids the hassle of having to reset the timer switch after power outages. This is such a great improvement over our old "dumb" timer switches. This device was fairly easy to program.

I am an electrician by trade and have wired more than 50 time clocks in my career. Intermatic is the industry standard for time clocks. They are quality built and basic in operation. I'm not even going to go in to low voltage digital time clocks which are almost personal computers these days. Anyway. Is this difficult to wire for your your very first time?? PROBABLY. Once you wire one, these intermatics are pretty much identical. This one is 4 POLES or circuits. So you'll have 10 termination points:Timeclock Power (power & neutral)Poles 1-4 (Line & Load each)Can you use one of the circuits HOT to power the time clock?? ABSOLUTELY.The astronomic programming can be a challenge the first time. Would say not user friendly, but it's like a new Samsung smart phone when you've used IPhones your whole life. Just take your time!! Thanks

If you have Intermatic timers, replace them with these and never have to make an adjustment to them again!Our building replaced two of the timers with these to give them a test. So far, amazing. They constantly adjust automatically, not just daylight savings observation. Pick the time of day where you want the lights to turn on based on the general illumination of that time, and these will follow that time of day throughout the year, always adjusting "X number of minutes before sunrise, etc...". EASY to program. Reliable commercial company, so I predict they will last a lifetime.

I use this timer to control a pool filter pump, a booster pump and the pool light. I am switching both 120V and 240V loads. I love the flexibility of filtering the pool on the weekdays of my choice. I also set the pool light to turn on at sundown and turn off at 11pm. This model now has a supercapacitor backup instead of a battery. I have had the power off to the timer for various maintenance needs up to a week and the internal clock and timer settings have remained stored. It keeps very accurate time.

convient parfaitement

Quick delivery. Easy to install and logical to program sundown and sunrise on / off switching

Like. Used on parking lot lights