---
product_id: 16121418
title: "LEDwholesalersDimmable 12-Volt DC Magnetic Transformer Power Supply for LED Flexible Strips, ETL Listed, 300 Watt, 3257-12V"
brand: "ledwholesalers"
price: "$524.74"
currency: USD
in_stock: true
reviews_count: 7
url: https://www.desertcart.us/products/16121418-ledwholesalersdimmable-12-volt-dc-magnetic-transformer-power-supply-for-led
store_origin: US
region: United States of America
---

# 300W Power Dimmable Feature Nema 3R Rated LEDwholesalersDimmable 12-Volt DC Magnetic Transformer Power Supply for LED Flexible Strips, ETL Listed, 300 Watt, 3257-12V

**Brand:** ledwholesalers
**Price:** $524.74
**Availability:** ✅ In Stock

## Summary

> Illuminate Your World! 💡

## Quick Answers

- **What is this?** LEDwholesalersDimmable 12-Volt DC Magnetic Transformer Power Supply for LED Flexible Strips, ETL Listed, 300 Watt, 3257-12V by ledwholesalers
- **How much does it cost?** $524.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/16121418-ledwholesalersdimmable-12-volt-dc-magnetic-transformer-power-supply-for-led)

## Best For

- ledwholesalers enthusiasts

## Why This Product

- Trusted ledwholesalers brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First:** Dual protection with primary and secondary circuit breakers.
- • **Outdoor Ready:** Nema 3R enclosure ensures durability in any weather.
- • **Certified Quality:** ETL listed and CSA certified for peace of mind.
- • **Power Up Your Ambiance:** Transform your space with 300 watts of dimmable power!
- • **Versatile Compatibility:** Works seamlessly with most standard MLV TRIAC dimmer switches.

## Overview

The LEDwholesalers Dimmable 12-Volt DC Magnetic Transformer Power Supply is a robust 300-watt solution designed for LED flexible strips. With dual circuit protection and a Nema 3R enclosure, it’s perfect for both indoor and outdoor applications. This ETL listed transformer is compatible with most standard dimmer switches, ensuring a customizable lighting experience.

## Description

LEDwholesalersDimmable 12-Volt DC Magnetic Transformer Power Supply for LED Flexible Strips, ETL Listed, 300 Watt, 3257-12V

## Features

- Dimmable with most standard MLV TRIAC (leading edge) dimmer switch
- Dual protection – primary and secondary circuit breakers
- Nema 3R Enclosure – suitable for outdoor use
- Two knock-outs for conduit
- ETL listed; certified to CSA standard

## Images

![LEDwholesalersDimmable 12-Volt DC Magnetic Transformer Power Supply for LED Flexible Strips, ETL Listed, 300 Watt, 3257-12V - Image 1](https://m.media-amazon.com/images/I/41R3F2VaicL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    This is a well made unit
  

*by M***. on Reviewed in the United States on March 23, 2022*

This is a well made unit. I ended up not using it because the one I had that came with the led light just need to reset the internal fuse. I would definitely buy this one if the original one ever fails.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    very quiet but size it accordingly!
  

*by N***R on Reviewed in the United States on March 3, 2014*

Intended to provide some backlighting using LED strips SMD5050 (6 in total) cut back to 30".  Spec for the strips says less than 6 amps/72 Watt for 196" - so I thought the 60W transformer would be adequate.  It's not - needless to say that the temperature control switch triggered within the first hour of use and the humming noise was noticeable.Upgrading to 300W instead has solved that issue - 150W might have been enough but I honestly didn't take my chances - the 60 bucks was just not worth it.  Size the unit according to your use and leave room for contingency or make sure that you verify the consumption and not just trust the specs - would have saved me the money on the smaller transformer ;-)

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works well on LED strip lights... very happy
  

*by L***D on Reviewed in the United States on September 17, 2014*

This thing is big but works well - I used it for a large run of LED strip lights that I wanted to dim through a wall switch.  Because I was doing an attic install (where it get's hot) I wanted to properly de-rate this so I purchased the 300W model even though I am only burning about 120W or so.It's been installed for a few weeks and so far I'm very happy with it.In case you are wondering - the advantage of this kind of LED power supply is you can dim it on the AC side (via wall switches as long as they are magnetic rated) -- It works very well for that.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-12*