Square D EXN 150kVA Dry-Type D...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16,210.00
Square D EXN 150kVA Dry-Type Distribution Transformer, 480V Delta to 208Y/120V

Square D EXN 150kVA Dry-Type Distribution Transformer, 480V Delta to 208Y/120V

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Model: EXN150T3H

In Stock (leaves warehouse same day if ordered before 3pm ET)

$16,210.00
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Square D EXN 150kVA Dry-Type Distribution Transformer, 480V Delta to 208Y/120V

The Square D EXN Series is a three-phase, low-voltage dry-type distribution transformer built to comply with DOE 2016 energy conservation standards and Natural Resources Canada (NRCan) minimum efficiency levels. This 150kVA unit steps 480V delta (three-wire) primary power down to a 208Y/120V secondary, delivering 98.89% efficiency at 35% load factor (75.0°C) for demanding commercial and industrial distribution applications.

Key Features

  • Power Rating: 150kVA, three-phase dry-type transformer for indoor or ceiling/floor-mounted distribution.
  • Voltage Configuration: 480V delta (three-wire) primary stepping down to a 208Y/120V secondary.
  • Energy Efficiency: 98.89% efficiency at 35% load factor, 75.0°C, supporting DOE 2016 fully compliant performance.
  • Temperature Rise: 150°C rise on a 220°C insulation system for extended service life.
  • Electrical Connections: 6-hole NEMA pad secondary (X and XO, 11.1 mm) plus 4-hole NEMA pad primary and secondary connections (11.1 mm).
  • Mounting Support: Floor-mounted standard; ceiling mount available with 7400CMB22M accessory or floor mount with 7400FMB accessory.
  • Tap Configuration: 4 taps at 2.5% FCBN and 2 taps at 2.5% FCAN for field voltage adjustment.
  • Noise Level: 47 dB, meeting NEMA ST-20 sound level guidelines.
  • Impedance & BIL: 3.10% impedance voltage with a 10 kV rated impulse withstand voltage (Uimp).
  • Frequency: Rated for 60 Hz network operation.

Certifications & Compliance

  • NEMA ST-20
  • UL 1561
  • CSA C22.2 No 47
  • ROHS EUR Compliant
  • Mercury Free
  • Toxic Heavy Metal Free

Technical Specifications

  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • Sustainable Packaging: Yes
  • Packaging Without Single Use Plastic: Yes
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • China ROHS Label: 1
  • Serviceability: Yes
  • With Recycled Cardboard: Yes
  • WEEE Product Category: 5
  • Box Number: 22M
  • China ROHS In Scope: No
  • Return Indicator: Y
  • Average Ambient Air Temperature For Operation: 30 °C
  • Take Back: No
  • Transformer Type: energy efficient
  • Returnability: Yes
  • Field Service Division: PSIBS
  • Reach Free Shvc: Yes
  • WD Status: 1 - GSC certified

Typical Applications

  • Commercial and Industrial Power Distribution
  • Panelboard and Switchgear Step-Down Feeds
  • 480V to 208Y/120V Voltage Conversion Systems
  • Indoor Floor or Ceiling-Mounted Installations
  • New Construction and Electrical Retrofit Projects

Why Square D?

Square D EXN dry-type transformers combine DOE 2016 energy efficiency compliance with NEMA ST-20, UL 1561, and CSA C22.2 No 47 recognized construction, delivering dependable, code-compliant performance for professional electrical installations. With an average life duration of 25 years and a mercury-free, toxic heavy metal-free design, this transformer is built for long-term reliability in demanding commercial and industrial power distribution systems.

Manufacturer Resources

Product Specs

Product Type:
General Purpose Transformer
Voltage Rating:
480V Delta / 208Y/120V
Configuration:
3 Phase
Standards:
UL 1561
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Transformers
Country of Origin:
Mexico
Product Depth:
32.56 in
Product Material:
Aluminium
Product Height:
40.59 in
Product Width:
33.66 in

Square D EXN150T3H – Frequently Asked Questions

1) Will the Square D EXN150T3H work on a 480V three-wire delta service feeding a 208Y/120V panel?
That is exactly what the EXN150T3H is built for. The primary is 480V delta, three wire, and the secondary is 208Y/120V wye with a neutral point (XO), 3 phase at 60 Hz. It is a 150kVA unit, so it suits step-down feeds to panelboards and switchgear where you need 120V line-to-neutral and 208V line-to-line off a 480V distribution system.
2) Can the EXN 150kVA transformer be ceiling mounted, or is it floor mount only?
Floor mounting is the standard configuration. For a ceiling hang you need the 7400CMB22M mounting accessory, and there is also a 7400FMB floor mount accessory. Neither bracket ships with the transformer, so add the one you need to the order. The unit is an indoor dry-type, so plan the location accordingly.
3) Can I adjust the output voltage if my 480V feed runs high or low?
Yes, the EXN150T3H has field taps on the primary: 4 taps at 2.5% full capacity below normal (FCBN) and 2 taps at 2.5% full capacity above normal (FCAN). That gives you up to 10% below and 5% above nominal in 2.5% steps, so you can trim the 208Y/120V secondary when the incoming service sits off nominal.
4) Does this Square D transformer meet current DOE efficiency rules for a new commercial build?
The EXN Series is built to DOE 2016 energy conservation standards and also meets Natural Resources Canada minimum efficiency levels. The 150kVA unit is rated 98.89% efficient at 35% load factor at 75.0 degrees C, which is the DOE reference point. That is the number an inspector or energy consultant will ask for on a new commercial or industrial installation.
5) What lugs or pads does the EXN 150kVA transformer use for landing feeder conductors?
Connections are NEMA drilled pads, not screw lugs. The secondary has a 6-hole NEMA pad on X and XO at 11.1 mm hole size, plus 4-hole NEMA pad connections on both primary and secondary at 11.1 mm. Plan on bolted lugs or busbar sized to that NEMA hole pattern; cable lugs are not part of the transformer.
6) How loud is a 150kVA dry-type transformer like this if it goes in an occupied space?
The EXN 150kVA is rated at 47 dB, which meets the NEMA ST-20 sound level guideline for a unit this size. That is quiet enough for most electrical rooms and back-of-house areas, but 47 dB is still audible as a constant hum, so mounting it directly against a demising wall to an office or patient room is something to avoid.
7) What temperature rise and insulation class does the Square D EXN 150kVA use, and what ambient can it sit in?
It is a 150 degree C rise unit on a 220 degree C insulation system, rated for an average ambient air temperature of 30 degrees C. The margin between the 150 rise and the 220 class is what gives it extended life under continuous load. If your electrical room runs hotter than a 30 degree C average, the room needs ventilation before the transformer goes in.
8) What impedance and BIL does the EXN150T3H have for a short circuit study?
Impedance voltage is 3.10% and the rated impulse withstand voltage (Uimp, BIL) is 10 kV. The 3.10% impedance is the figure your engineer uses to calculate available fault current at the 208Y/120V secondary, which in turn sets the AIC rating needed on the downstream panelboard.
9) Is the Square D EXN150T3H suitable for an outdoor pad or exterior wall?
No. The EXN 150kVA is an indoor dry-type transformer, intended for indoor floor or ceiling-mounted distribution. For an exterior location you need a weatherproof-enclosure transformer instead, or the unit has to go inside a rated outdoor equipment room or enclosure.
10) What is the model number to order for the 150kVA 480V to 208Y/120V Square D EXN transformer?
The catalog number is EXN150T3H from Square D, a 3 phase 150kVA dry-type unit, 480V delta primary to 208Y/120V secondary. Order the mounting bracket separately if you are not setting it on the floor with the supplied arrangement.
11) Is this transformer field serviceable, or is it a sealed replace-only unit?
The EXN 150kVA is listed as serviceable, and Square D quotes an average life duration of 25 years. For a facilities or MRO group that means tap changes, connection torquing, and coil inspection are normal maintenance items rather than grounds for replacing the whole unit.
How fast can I get the Square D EXN150T3H delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D EXN150T3H come with a warranty?
Absolutely. The Square D EXN150T3H is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D EXN150T3H?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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