Intermatic 300 Watt Transformer



  (4.84 out of 5 Stars on 6 Ratings)

resources:   Q&A: Ask a Question  | Q&A: View Answers (13) | Reviews (6) | Documents (1) | Parts (2)

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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)


12 V
300 W

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Ask a Question

Asked on 05/08/2016 by Costas

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

Inyo Answer

Answered on 05/11/2016 by Product Specialist Lennox H.

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


Asked on 04/17/2016 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.

Inyo Answer

Answered on 04/19/2016 by 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 06/18/2015 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?

Inyo Answer

Answered on 06/18/2015 by 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 06/09/2015 by tom burrell

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

Inyo Answer

Answered on 06/09/2015 by Product Specialist Dennis R.

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


Asked on 06/08/2015 by SAM PERRI


Inyo Answer

Answered on 06/11/2015 by 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 05/22/2015 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?

Inyo Answer

Answered on 05/25/2015 by 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 05/07/2015 by Allan

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

Inyo Answer

Answered on 05/14/2015 by 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 04/08/2015 by Julio

Can this transformer be connected to a 230v source?

Inyo Answer

Answered on 04/08/2015 by Product Specialist Robert M.

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


Asked on 04/06/2015 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?

Inyo Answer

Answered on 04/06/2015 by 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?

Inyo Answer

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

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


Asked on 01/24/2013 by Guest

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

Inyo Answer

Answered on 01/24/2013 by 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?

Inyo Answer

Answered on 12/16/2006 by 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 06/05/2006 by Guest

Is is this transformer weather proof?

Inyo Answer

Answered on 06/05/2006 by Product Specialist Patrick P.

Yes the Intermatic transformer is weather proof.

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Ratings Summary

Average Rating:   (4.84 out of 5 Stars)

Recommended: (100%) 6 of 6 customers would recommend this product to a friend.

6 Ratings 5 star:   (5) 4 star:   (1) 3 star: (0) 2 star: (0) 1 star: (0)

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The Most Helpful Review

2 of 3 people found the following review helpful:

   (5 out of 5 Stars) Step down transformer

Reviewed By: from Holmdel, New Jersey ()

Very happy with the product. It arrived on time and performed well.

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The Most Recent Reviews

1 of 1 person found the following review helpful:

   (5 out of 5 Stars) Great transformer easy to install

Reviewed By: from Bakersfield ca ()

Pros: Easy

Cons: None

A++ transformer doing is job, easy to install.

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   (5 out of 5 Stars) Brand Name Item

Reviewed By: from Independence, Ohio ()

Great value. It was priced better than a local retailer even with shipping.

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   (5 out of 5 Stars) Wiring diagram in french

Reviewed By: from Fort Walton Beach, FL ()

The transformer arrived in two days. Shipping status was great. Only issue was the wiring diagram was in french. Quick lanquage lesson solved the situation.

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   (5 out of 5 Stars) Great 300 Watt Transformer

Reviewed By: from Niceville, FL ()

Delivery was very prompt and packaged well. Transformer was exactly what I wanted and very easy to install. I highly reccomend it.

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   (4 out of 5 Stars)

Reviewed By: from Tucson, AZ ()

Pros: Does what it's supposed to.

Cons: Kind of noisy, mount it away from where you will be.

Had it for nine months with an Intellibrite systems, works OK. It does make noises when the lights are programming (the controller programs the lights by powering off and on rapidly a set number of times for each color or program), and hums a bit otherwise. I have it mounted on a back wall behind a screening fence, still can hear it.

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