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Now In: Power Supplies  >  Low Voltage Transformers  >  Magnetic Low Voltage Transformers  >  250 Watt - 12 Volt - Hardwire - Magnetic Transformer - Boost Tap - Magnitude

Product Overview:
  • Maximum watts: 200
  • Dimmable
  • Boost tap
  • Indoor use
  • 5-Year warranty
  • ETL listed
  • Learn More

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250 Watt - 12 Volt - Hardwire - Magnetic Transformer - Boost Tap - Magnitude

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250 Watt - 12 Volt - Hardwire - Magnetic Transformer - Boost Tap - Magnitude

Item #PM250S-12V
AvailabilityUsually ships the next business day
Quantity  Add to cartAdd to Wishlist
Please NoteStandard shipping (US48) is
$8 per item due to size of transformer

About our 250 Watt - 12 Volt - Hardwire - Magnetic Transformer - Boost Tap - Magnitude

This 250-watt low voltage magnetic transformer will power your 12-volt lighting systems. This transformer has a boost tap lead, which can compensate for voltage drop associated with long runs.

  • Uses: used to power 12-volt lighting systems
  • Maximum Load: 200 watts maximum of lighting load. Like most magnetic transformers, these transformers can be used to power up to about 80% of their wattage rating. [Caution: Always attach the load to the transformer before connecting the transformer to power.]
  • Input: 120 volts AC, 60 Hz, 2.1 amps
  • Input Leads: one 18 AWG white wire and one 18 AWG black wire
  • Output: 11.5 volts AC
  • Output Leads: 12 AWG blue wires [Suggestion: Use a terminal block for each connection in the 12V output circuit and make certain that these connections are very tight and secure. Also, be sure that the gauge of the electrical wire used in the output circuit is not less than 12 AWG.]
  • Boost Tap: includes orange boost tap wire, which can be used to compensate for voltage drop between the transformer and the light fixture. To use, simply connect the input wires to the white and orange leads instead of the white and black leads. The boost tap option should be used if the light fixtures are receiving 10.5 volts or less.
  • Installation: the transformer and all of the hardwired electrical splices (connections) can be conveniently stored in the included metal enclosure
  • Metal Enclosure: easy opening case with knock-outs for hardwiring. Powder coated textured paint finish.
  • Case Size: 6-2/5in(H) x 3-2/5in(W) x 3.0in(L)
  • Dimmable: fully dimmable using a dimmer designed for a magnetic transformer. [Caution: dimmer should always be connected to the input side, 120V side, of a transformer.]
  • Thermal Shutdown Protection: yes with manual reset circuit breaker on the secondary side
  • Easy to Install: please refer to these Installation Instructions (PDF). [Caution: Always check local electrical codes and the National Electrical Code (NEC) before installing any lighting products. It is also wise to consult with a licensed electrician in your geographical area about any electrical details that you might have questions about and to make certain that you are satisfying all of the appropriate electrical codes.]
  • Color: black
  • ETL Listed: ETL Listed in the USA and Canada
  • 5 Year Warranty: this transformer carries a 5 year warranty
  • Large Quantity Discount: If you would like us to quote on a large quantity of 250W 12V AC Magnetic Low Voltage Transformers, please call us at our toll-free number or use the online Quotation Request for Large Quantities form. We are always happy to provide you with our best large quantity pricing.

    ETL Listed  5-Year Warranty  Satisfaction Guarantee    Installation Difficulty

Product Reviews
250 Watt - 12 Volt - Hardwire - Magnetic Transformer - Boost Tap - Magnitude
5 Stars based on 1 Review(s)
Seattle, WA
5 Stars
I would recommend this item to a friend.

Works as described
December 26, 2011
Works perfectly as described.

Questions & Answers
By Nick from San Mateo, CA on February 1, 2014
What is the thermal shutdown temperature of this transformer?
By Jacob from Pegasus Lighting on February 2, 2014

158 degrees F.

By Paul from Austin, TX on December 10, 2012
is this rated for outdoor use?
By Jacob from Pegasus Lighting on December 11, 2012


No, to see our outdoor transformers, visit this page:

By Ewart Martens from Minneapolis, MN on December 27, 2014
The transformer for my IKEA Norrsken Halogen Cable light system appears to be failing (lights work intermittently, go off or come on their own, wall switch has been replaced). The markings on the transformer state: Input 120 Volts, 60HZ. Output 12V Max. 7 x 20 Watts
Am I looking at the right product for a replacement or do you have another suggestion? Thanks for your help.
By Jacob from Pegasus Lighting on December 29, 2014

I have a few suggestions. First, you may want to have an electrician test the circuit to verify that it's the transformer. It could be as simple as a loose wire connection in the circuit.

Second, yes, this transformer can replace yours. The only concern I would have is dimensions and where you intend to mount it. You may be better off using an electronic transformer because of size.

By Kris from Milwaukee, WI on October 27, 2014
Can this transformer handle low volt LED puck lights and dim them without flickering? I am aware that I need the proper dimmer as well.
By Jacob from Pegasus Lighting on October 28, 2014


It depends. LED systems have very specific requirements. Check with the manufacturer of the LED system for power supply requirements. This is a 12-Volt AC transformer. Many LED systems require 12-Volt DC instead.
By Justin from VA on October 29, 2014

Yes, this transformer should be sufficient. I would recommend the customer use the boost tap initially vs regular power especially if the run is longer then 25 feet.

By Siprian Duenas from Illinois on October 31, 2014
Can this transformer work with halogen lights?

By Jacob from Pegasus Lighting on October 31, 2014

Absolutely! It will power 12V halogen lights.
By Greg from Waukesha, WI on November 1, 2014

Yes. I currently have track lighting with MR16 lamps powered from this transformer and it works very well.

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