Square D 1S1F Dry-Type Encapsu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$280.31
Square D 1S1F Dry-Type Encapsulated Transformer, NEMA 3R, 1 Phase

Square D 1S1F Dry-Type Encapsulated Transformer, NEMA 3R, 1 Phase

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Model: 50SV1A

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

$280.31
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Square D 1S1F Dry-Type Encapsulated Transformer, NEMA 3R, 1 Phase

The Square D 1S1F Dry-Type Encapsulated Transformer is a resin-filled, general purpose transformer engineered for reliable voltage transformation in commercial and industrial systems. Epoxy encapsulation seals the core and coil with no enclosure openings, protecting the internal windings from dust and moisture, while the painted sheet steel enclosure is wall mounted and carries a NEMA 3R rating for wet and outdoor-adjacent locations. This 1 phase unit is built around a 240 x 480 V / 120/240 V primary configuration, is cULus and CSA listed, and is TAA compliant for government and institutional procurement. Related motor protection accessories in this family are available across Motor FLA ratings from 1A to 7A to match downstream load requirements, with shared voltage and enclosure specifications carrying across the range.

Key Features

  • Resin Encapsulated Construction: Epoxy-filled design with no enclosure openings, protecting windings from dust and moisture for long service life.
  • Enclosure & Mounting: Painted sheet steel enclosure, wall mounted, rated NEMA 3R for outdoor-adjacent and wet-location applications.
  • Primary Voltage: 240 x 480 V / 120/240 V primary configuration for flexible system compatibility across common distribution voltages.
  • Phase: 1 phase design suited to general purpose distribution needs.
  • Configurable: Can be configured into an autotransformer for added application flexibility.
  • Sizing Range: Available in individual enclosures from 50VA through 5kVA to match load requirements.
  • Motor FLA Compatibility: Companion products in this line are offered from 1A to 7A Motor FLA to support coordinated protection.
  • Compliance: TAA compliant construction supports government procurement requirements.

Certifications & Compliance

  • cULus
  • UL Listed
  • CSA
  • NEMA 3R
  • RoHS EUR Compliant
  • TAA Compliant

Technical Specifications

  • Standards: UL-CSA
  • Voltage Rating: 240 x 480V / 120/240V
  • Country of Origin: Mexico
  • Device Type: Transformer - dry
  • Phase: 1 phase
  • Warranty: 18 months
  • Mercury Free: Yes
  • Toxic Heavy Metal Free: Yes
  • Number Of Tap Offs: 0

Typical Applications

  • Commercial and Industrial Electrical Distribution
  • General Purpose Voltage Transformation Worldwide
  • Autotransformer Configurations
  • Wall-Mounted Panel and Equipment Installations
  • Wet and Outdoor-Adjacent Locations (NEMA 3R)
  • Coordinated Motor Protection Across the 1A–7A FLA Range

Why Square D?

Square D backs this transformer with cULus, UL, and CSA listings, RoHS-compliant materials, and a resin-encapsulated, no-openings design that resists dust and moisture. The painted sheet steel, wall-mounted NEMA 3R enclosure, 240 x 480 V / 120/240 V primary, and TAA-compliant build make it a dependable choice for code-compliant electrical distribution work across a wide range of voltage and load configurations.

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Manufacturer Resources

Product Specs

Product Type:
General Purpose Transformer
Configuration:
NEMA 3R Enclosure
Listing:
cULus
Standards:
UL-CSA
Voltage Rating:
240 x 480V / 120/240V
Product Material:
Painted Sheet Steel
Department:
Electrical
Product Group:
Power Distribution
Product Finish:
Painted Sheet Steel
Product Subgroup:
Transformers

Square D 50SV1A – Frequently Asked Questions

1) Can the Square D 1S1F transformer be installed outdoors or in a wet location?
The 1S1F is housed in a painted sheet steel enclosure rated NEMA 3R, so it is suited to wet and outdoor-adjacent locations. The core and coil are epoxy encapsulated with no enclosure openings, which keeps dust and moisture off the windings. It is a wall-mounted unit, so you need wall or structure to fasten it to, not a floor pad or frame.
2) What primary and secondary voltage does the Square D 1S1F dry-type transformer work with?
It is built around a 240 x 480 V / 120/240 V configuration, single phase. That means it can be connected on a 240 V or 480 V supply and give you 120/240 V on the load side, which covers the two most common commercial distribution voltages without having to stock two different units.
3) Is this a three phase transformer? I need it for a 3 phase panel.
No. The Square D 1S1F is a 1 phase dry-type encapsulated transformer. For a three phase load you need a three phase general purpose transformer instead; this one will not serve a 3 phase panel.
4) Does the Square D 1S1F transformer have UL and CSA listings for an inspection?
It carries cULus listing and is built to UL-CSA standards, with UL Listed and CSA noted in the product data. It is also TAA compliant and RoHS compliant, which matters if you are buying for government, healthcare, or education procurement.
5) Which Motor FLA options are offered, and what part number goes with each?
Three Motor FLA choices are offered across this family: 1A (part 50SV1A), 4A (part 250SV1B), and 7A (part 1S1F). Match the choice to the full load amps of the motor you are protecting downstream; voltage and enclosure specs stay the same across the range.
6) What kVA sizes does this Square D encapsulated transformer line cover?
Individual enclosed units run from 50 VA up to 5 kVA, so you size it to the connected load rather than to the panel. Pick the rating above your calculated load, not at it.
7) Can this Square D transformer be wired as an autotransformer?
Yes, the unit can be configured as an autotransformer. Worth noting it has zero tap offs, so there are no voltage taps to adjust for line conditions once installed.
8) Why does an encapsulated transformer get specified instead of a vented dry-type?
Encapsulation is about the environment. Resin sealing the core and coil with no enclosure openings keeps dust and moisture out, which is what lets it go in damp or outdoor-adjacent spots under the NEMA 3R rating. A vented dry-type breathes and is normally kept to clean indoor mechanical rooms. If the transformer is going in a parking structure, a loading dock wall, or a car wash back room, encapsulated is the right call.
9) Where is the Square D 1S1F transformer made, and does it qualify for federal projects?
Country of origin is Mexico, and the build is TAA compliant, which is what federal and institutional procurement rules generally look for. Materials are mercury free and free of toxic heavy metals.
How fast can I get the Square D 50SV1A 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 50SV1A come with a warranty?
Absolutely. The Square D 50SV1A 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 50SV1A?
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
Why buy the Square D 50SV1A from ZenSupply?
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