Intermatic 300 Watt Transformer - PX300



Part # PX300

By Intermatic

  4.88 Average  



Part # PX300

Dimensions 7-1/8" X 5-1/8"

Product Description

12V 300 watt Galvanized Steel Transformer
Safety transformer supplies 12 volts to pool and spa lights, submersible fixtures and outdoor garden lights.

Designed for safe operation with a grounded shield between the primary and secondary windings.  Also includes built-in circuit protection that disconnects power to the transformer in case of defect or overload.

Can be used with multiple 12v lights, not to exceed total wattage of 300.

Product Specs

  • 300 Watt
  • Steel enclosure (beige)
  • Weather proof
  • 120 V, 3 Amp
  • 12,13 or 14 V
  • Dimensions: 7.25" (Height) X 5.25" (Width) X 4.5" (Depth)


Product Specifications

12 V
300 W

?     Asked on 11/21/2018 by Ray DeGeorge

I have a California series Two 300 watt timer transformer over 15 yrs which recently bit the dust. An electrician connected a photo cell to it bypassing the timer which worked just fine for a few yrs, it is now not working at all. Will this transformer work for me?

A  Answered on 11/27/2018 by InyoPools Product Specialist Jamie H.

Hi Ray, the Intermatic 300 Watt Transformer - PX300 will work.

?     Asked on 6/20/2018 by Dominic Modafferi

how do I know if I need a 300w or 100w will the old transformer have it listed inside the box. my light doesn't work and an electrician advised me to get a new transformer

A  Answered on 6/20/2018 by InyoPools Product Specialist Andy O.

Hello Dominic- You would need to know the wattage of the light and/or lights that are connecting to the transformer. For example, if you have three100 watt lights connected to the transformer you will need a minimum of a 300-watt transformer.

?     Asked on 5/22/2018 by Kristan

Okay, since the 400 watt light bulb will not work with the PX300, do I just replace the bulb with a 300 watt or do I have to purchase a new fixture?

A  Answered on 5/23/2018 by InyoPools Product Specialist Patrick P.

Hi Kristan, Can you confirm that your light is 12 Volt and not 120 Volt? Typically 12V pool lights are only made in wattages up to 300 Watts. If you do indeed have a 120V 400 Watt light then a transformer is not needed for a 120V light.

?     Asked on 5/18/2018 by Kristan

I have a 400 watt Pool light. Will this unit work?

A  Answered on 5/18/2018 by InyoPools Product Specialist Lennox H.

Hi, Kristan. This transformer will not work, you will need the PX600 model to operate a 400 watt 12v light fixture. 

?     Asked on 8/12/2017 by Steve

Hello, can I run multiple Hayward ColorLogic Lights total of 6 and a Hayward AstroLite 12v, 300w with the Intermatic PX600

A  Answered on 8/13/2017 by InyoPools Product Specialist Alex V.

Steve, Up to 3 Universal ColorLogic/CrystaLogic LED pool lights can be connected to a single PX300 transformer.

?     Asked on 4/24/2017 by Bruce

The PX300 has two black output wires. I am a bit confused. Does it matter which one you hook up to the black on the light? Is there a common and a hot on a 12v?I haven't order 12v LED lights yet and am assuming they have white,green, and black leads???

A  Answered on 4/27/2017 by InyoPools Product Specialist Scott W.

I recommend giving Intermatic a call for those details, their number is 815-675-2321.

?     Asked on 4/12/2017 by mike


A  Answered on 4/13/2017 by InyoPools Product Specialist Andy O.

Hello Mike- Here is a link to the owner's manual that will help with the installation of your transformer.

?     Asked on 1/29/2017 by Gib

Is it possible to send me a picture of the inside of this box or post one for us to view. Thanks, as I want to see how many Breaker switches this box will hold.

A  Answered on 1/30/2017 by InyoPools Product Specialist Stacey M.

Hello Gib, unfortunately all we have is a picture of what is inside the box for wiring.

?     Asked on 1/22/2017 by mike

I have an old pool light. I am changing to an Intellibrite 5G color 12v light with a controller. The current 300 watt transformer is connected to the 13v tap. The 13v cord is approximately 100' long. Is this 13v connection satisfactory?.

A  Answered on 1/24/2017 by InyoPools Product Specialist Adam Y.

There are setup for 12v,13v, and 14v I would make sure your on 12 volts.

?     Asked on 12/21/2016 by Michael

Hello, I am buying the following lights for my pool: Pentair Intellibrite 5g 12v 100' Color LED Spa Light Pentair Intellibrite 5g 12v 30' Color LED Pool Light Pentair GloBrite 12V 100' Cord I can not find the wattage demand for this lights, will a 300 Watt transformer be sufficient? Best Regards, Michael

A  Answered on 12/21/2016 by InyoPools Product Specialist Adam Y.

Good morning Michael, Yes with them being Led they're caping at 35 watts so the 300 watt transformer will be plenty enough.

?     Asked on 12/4/2016 by

Can the PX300 transformer be used to power the Hayward SP058150 AstroLite Pool Light (the light is 300 watt, 12 volt)

A  Answered on 12/5/2016 by InyoPools Product Specialist Lennox H.

Hi. Yes, this PX300 transformer can be used to power the Hayward SP058150 light.

?     Asked on 8/7/2016 by Chris

My LED pool light flashes only briefly when the switch is thrown; it won't flash at all after that when switched on (unless I wait awhile). Is the problem likely the transformer? I have an INtermatic PX100. thanks!

A  Answered on 8/8/2016 by InyoPools Product Specialist Lennox H.

Hi Chris, Yes, the problem could be the transformer not sending the correct voltage to the light.

?     Asked on 6/29/2016 by james shaul

will this transformer work with 2 penstar lights using 69100000 bulbs

A  Answered on 6/29/2016 by InyoPools Product Specialist Joe S.

You would need two transformers as each light is 200 watts.

?     Asked on 6/27/2016 by gary

I have 300 W - 120 V 60Hz weather proof unit that has the ratings of 15V Max.OCV with a secondary current rating @ 25 amps. Is your unit compatable as a replacement? even though it rates a 3 amps

A  Answered on 7/3/2016 by InyoPools Product Specialist Lennox H.

Hi Gary, The PX300 is not compatible because it's maxed amperage is 3..

?     Asked on 6/20/2016 by sal coriale

put new transformer on got a 300 cause could not read what wattage was on old one does it matter???> I did see after the fact it was a 100 watt transformer

A  Answered on 6/26/2016 by InyoPools Product Specialist Lennox H.

Hi Sal, The 300 Watt Transformer will work if you have a 100 watt light as long as the total wattage does not exceed 300 watts.

?     Asked on 6/16/2016 by Roland Weaver

would this work with a Hayward AquaRite (Goldline) electronic chlorine generator ? if so, which size wattage is suitable for an 18 x 36 in ground pool?

A  Answered on 6/16/2016 by InyoPools Product Specialist Patrick P.

Hi Roland, this transformer will not work the Hayward Goldline Aquarite. You would need this Hayward Aquarite Transformer.

?     Asked on 6/14/2016 by SLR

Is this unit acceptable for replacing the SafetyVolt ST300 pool lght transformer?

A  Answered on 6/19/2016 by InyoPools Product Specialist Lennox H.

Hi SLR, This Intermatic 300 Watt Transformer will replace your SafetyVolt ST300 transformer.

?     Asked on 6/14/2016 by

2 of my pool lights went out weeks apart. The pool service states that I must have a 300 watt light replacement vs a 100 watt light replacement because I have a 300 Watt Transformer. Is this true?

A  Answered on 6/18/2016 by InyoPools Product Specialist Lennox H.

Hi, Yes, a 300 watt transformer is typically used with a 300 watt 12 volt pool light.

?     Asked on 6/9/2016 by Hugh

How can I hookup a timer to use the PX300 with garden lighting? Thanks

A  Answered on 6/19/2016 by InyoPools Product Specialist Alex V.

Hugh, The PX300 would be installed just like any 12v transformer. The unit comes with instructions.

?     Asked on 5/8/2016 by Costas

Is this transformer hardwired to 120V or plugs into outlet? Does it have a switch to turn on and off pool lights?

A  Answered on 5/11/2016 by InyoPools Product Specialist Lennox H.

Hi Costas, The transformer is hard wired to the breaker box that controls the pool lights.

?     Asked on 4/17/2016 by James

My new international 300 watt transformer buzzes continually when turned on. Installed by a pool company. They don't know how to fix it. How can I fix it? Thank you.

A  Answered on 4/19/2016 by InyoPools Product Specialist Lennox H.

Hi James, I'm not sure what's causing the buzzing sound, I would recommend contacting Intermatic at 815-675-7000 to troubleshoot.

?     Asked on 6/18/2015 by Mike

The operation and service manual states that the input must be 120v 3 amp max. How do I insure that I do not exceed 3 amps input?

A  Answered on 6/18/2015 by InyoPools Product Specialist Patrick P.

Hi Mike, If you are using this for a pool or spa light then as long as you stay at or below 300 Watt lighting then the amperage would be below 3 amps. This can be the combination wattage of multiple lights, for example three 100 watt lights would be fine. A standard 300 watt pool light draws 2.5 Amps at 120V.

?     Asked on 6/9/2015 by tom burrell

is the voltage on the 12v side ac or dc?

A  Answered on 6/9/2015 by InyoPools Product Specialist Dennis R.

Tom - The voltage on the 12V side is still AC.

?     Asked on 6/8/2015 by SAM PERRI


A  Answered on 6/11/2015 by InyoPools Product Specialist Lennox H.

Sam, The Intermatic 300 Watt Transformer can go bad, however you may want to an electrician take at look at your lighting system because the light being dimmed may not be due to the transformer.

?     Asked on 5/22/2015 by Terry

I have a PX300 trying to run a pool light by Haywood, 12V 300 watt. The pool light would come on sometimes, then shut down. I had a spare PX300 new. Installed it. Have 12.18 volts to the light. Nothing lights. I tried 2 new bulbs. Nothing. Went straight to the transformer, hooked up a drop light with wire nuts to 12 volt leg and ground. Nothing. Ideas? Am I missing something?

A  Answered on 5/25/2015 by InyoPools Product Specialist Alex V.

Terry, Sorry to hear of your issue. I would recommend calling Intermatic to trouble shoot. You can reach them at 815-675-2321.

?     Asked on 5/7/2015 by Allan

Does it matter which lead is connected to the pool light wire after the transformer, they are identical, both are black.

A  Answered on 5/14/2015 by InyoPools Product Specialist Patrick P.

Hi Allan, It doesn't matter, just make sure they are the 2 thicker black wires that are going to the 12 volt light.

?     Asked on 4/8/2015 by Julio

Can this transformer be connected to a 230v source?

A  Answered on 4/8/2015 by InyoPools Product Specialist Robert M.

Hello Julio - Unfortunately this transformer cannot be hooked up to 230v.

?     Asked on 4/6/2015 by Fred Conrath

If a use a 300 watt transformer but only have 75 watts of LED lights does the transformer consume the 300 watts or the 75 watts being used by the LED lights?

A  Answered on 4/6/2015 by InyoPools Product Specialist Brian M.

It would only consume the wattage needed. No more.

?     Asked on 10/16/2013 by Guest

How much does this weight?

A  Answered on 10/16/2013 by InyoPools Product Specialist Patrick P.

This transformer is twelve(12) pounds(lbs).

?     Asked on 1/24/2013 by Guest

Can you hook up more than one light to this transformer?

A  Answered on 1/24/2013 by InyoPools Product Specialist Patrick P.

The PX300 is a 300 watt transformer. You can connect multiple lights to the transformer as long as the total combined wattage does not exceed 300 watts.

?     Asked on 12/16/2006 by Guest

I am going to purchase two 12 Volt lights do I need to purchase a transformer with these lights?

A  Answered on 12/16/2006 by InyoPools Product Specialist Patrick P.

The power coming from your house is 120V so you will need to purchase a transformer to drop the voltage from 120V coming from your house down to 12V going to the pool light. We sell two transformers the PX100 which can handle up to 100 watts and the PX300 which can handle up to 300 Watts. You may also put multiple lights on one transformer, for example if you had two 50 watt lights then you would only need to purchase one PX100 transformer and wire both lights into this single transformer.

?     Asked on 6/5/2006 by Guest

Is is this transformer weather proof?

A  Answered on 6/5/2006 by InyoPools Product Specialist Patrick P.

Yes the Intermatic transformer is weather proof.


Est. Repair Time

Less than 1 hr

Tools Needed

Licensed Electrician

0     3

Converting 2 pool lights to low voltage and LED

Written on 9/26/2017 by Guest

The transformer install was the one step that I hired an electrician to perform since it required conduit and we added an additional breaker to the Jbox. The installation was about the same cost as 1 new Pureline color-changing LED bulb.

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