PX300

I had a low-voltage transformer die last summer after a lightning strike near my home and needed to replace it. I found this Intermatic model on Amazon and have been very pleased with it ever since. It provides 300 watts of power for my lighting and is totally weatherproof in its design. The transformer I replaced was enclosed in plastic and always had problems with ants and other bugs getting inside. This Intermatic version features a steel enclosure that seals tight against the elements and anything else trying to get in. One thing to note is that this is only the step-down transformer and it doesn't include a photocell or timer that other units provide. This worked well for me since I had a timer controlling the entire circuit. The other nice feature of this unit is the easy selection of output voltage. Inside the unit you have the choice of several output voltages that allows you to adjust for carious loads. For example, if you only have a few lights located near the unit being powered by the transformer you can select the standard 12v setting. If instead you have a lot of light or a longer cable run you can select a slightly higher voltage to make up for the drop in current of the larger load. The ensures that all the lights will be the same intensity along the string. Great product - Well built and a good value!

As expected, Intermatic is what I consider to be the best product selection for outdoor timers and power supplies. It delivers the power perfectly within the specs stated in their instructions. As for the instructions, very straight forward and easy to understand even if your not a licensed electrician. I had it installed professionally thought by a licensed electrician. I use Intermatic timers for my pool equipment and they have been running for over 12 years with little or no problems. I intend to upgrade my pool timer with an Intermatic pool control system. They have a complete package with actuators, remote control and low voltage compartments for DC volt control systems at less than 1/2 the price of its competitors and it comes in a metal enclosure unlike the more expensive plastic ones!

I needed to replace two transformers for my pool. At 300 Watts, this was more than sufficient. I have one 300 Watt light in the pool and another 100 Watt light in the spa. I could save money and buy the smaller transformers with less Wattage capacity but this gave me the flexibility to add more lights and so I purchased two 300 Watt transformers. Input is 120volts AC. Output is 12, 13, or 14volts DC. Most lights are now low (12v) voltage and consume low power so this transformer is suitable for yard lighting or pool lighting; with 300 Watts available, I can imagine that one box could power an entire yard or driveway. My old transformers were twice the size/weight and all rusted on the inside and outside. I chose the PX300S because of the stainless steel housing (hence the "s" designation). The PX300 has a standard steel case that will begin to rust over time. The old transformers were functional but badly damaged from rain/corrosion; I was not going to take chances in my pool and replaced them when I built a new wall around my pool. I am no electrician but the diagram on the inside lid is self-explanatory. I simply knocked out the holes on the side, made a few adjustments to my wiring conduits with some parts from the local hardware store. The box comes with stainless brackets to allow mounting it on a wall. The wiring was a direct-connection using standard electrical parts. My old transformer (circa 1970s) was wired backwards but this transformer was much smaller in form factor and I simply reversed the wires inside the housing to make the connection work for me. Mine is made of stainless steel but painted gray; I have managed to accidentally scratch the housing and unlike the housing on my Intermatic pool timer, there is no rust! The front cover comes off completely and is held on with a single screw seen in picture - this really helps with access and wiring. It isn't an exciting purchase but with a little planning and some electrical conduit, any do it yourself home owner could create an outdoor lighting oasis.

I replaced the same transformer which was in a pretty harsh environment (I.e., 90% humidity, >100F) It held up well and performed but I wanted to replace it just to make sure everything stayed up and running. Price point is high but the quality is worth it. Highly recommended.

I had what I thought was a strange problem with my pool light for several years. The light would come on and run for around half an hour without any trouble, it would then shut off for a few seconds and then come back on. It would continue this pattern until it eventually killed the bulb in about a week and a half. Through some research I found out it was likely shutting off because it was sensing an overload or more likely, an over-heat condition. I had an electrician come out for unrelated work and chatted with him about the pool light. He asked if there was water in the fixture and when I told him there wasn't, he immediately told me I needed a new transformer. He told me he could do it for about a hundred bucks + parts but told me if I was comfortable with basic wiring I shouldn't mind doing it myself. Through some additional research I'm seeing these transformers have a useful lifespan of about 7 years or so. My old one was around 15 years old. If you have a pool light that doesn't work, an old transformer, and the light doesn't have water in it, this transformer is a good first step in trouble shooting.. Wiring is fairly straight forward with one exception, and the exception is why this is 4 stars instead of 5. I'm going to simplify a little for the sake of brevity. The box has two wires for the high voltage side and two wires for the side going to the light. The high voltage side is a black and a white wire. Simple enough, black to black and white to white. On the low voltage side it has two identical black wires with identical white writing on them. My pool light has one black wire and one white wire. A voltmeter straightened out which was hot but it could've and should've been easier. Update: Still no issues after over a year of use

I purchased this transformer for my outdoor lighting system, and yes it hums very loud. BUT I solved the humming problem and mine now runs almost silent. The problem was the timer switch, like most people I was using one of those Intermatic electronic switches the kind that fit inside an outlet box and you have to program the On and Off times. I believe these timing devices use a Triactor Diode to act as the switch, but being a diode it only conducts in one direction so it cuts the AC Sine wave voltage in half, so instead of getting a nice alternating current of plus 60 volts and then a negative 60 volts, the timer only gives either the plus or negative side so the transformer only sees 60 volts and it is being under voltaged and it HUMS VERY LOUDLY. I replaced my switch with this Intermatic P1121 Heavy Duty Outdoor Timer 15 Amp/1 HP - all is well. Hope this helps others.(and yes I'm an electrical engineer).

Intermatic | PX300 300W Pool Light Transformer was a replacement to one that had been in service for years. It installed in the place of the old one and worked flawlessly.

The transformer is solidly built and well sealed against the elements. I use this one to run an underwater pool light. I bought this 300-watt unit with the plan to add additional lighting which this unit can easily handle. I have another unit from Intermatic that is still performing well that is a little over 21 years old. This unit can output 12, 13, and 14 VAC, which gives you the ability to make long wiring runs without worrying about voltage drop. Highly recommend this unit and Intermatic in general.

Great price and easy to install