Square D 1S46F Buck-Boost Tran...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$471.09
Square D 1S46F Buck-Boost Transformer, Encapsulated, 120x240V Primary, NEMA 3R

Square D 1S46F Buck-Boost Transformer, Encapsulated, 120x240V Primary, NEMA 3R

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Model: 750SV43F

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

$471.09
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Square D 1S46F Buck-Boost Transformer, Encapsulated, 120x240V Primary, NEMA 3R

The Square D 1S46F Buck-Boost Transformer is a single-phase, encapsulated insulating transformer built to correct minor voltage mismatches on a circuit. This family is available in power ratings from 0.75kVA up to 1.5kVA, with secondary voltage options of 12/24V or 16/32V depending on the rating selected, all stepping down from a common 120 x 240V primary. It is ideal for buck-and-boost applications where supply voltage runs slightly high or low. Rated NEMA 3R for outdoor and wet-location duty and rated for a 115°C temperature rise, this transformer is designed for dependable performance in commercial and industrial electrical systems.

Key Features

  • Power Rating Range: Available from 0.75kVA through 1.5kVA, single phase, to match small buck-boost load requirements.
  • Primary Voltage: 120 x 240V primary configuration shared across the family.
  • Secondary Voltage Options: 12/24V or 16/32V secondary, designed to supply 12/24, 16/32, or 24/48V circuits depending on the rating selected.
  • Encapsulated Construction: Sealed design that helps protect internal windings from moisture and contaminants.
  • NEMA 3R Enclosure: Rated for outdoor and wet-location installations.
  • Temperature Rise: 115°C rise rating for demanding duty cycles.
  • Dual Isolation Design: Dual primary and dual secondary isolation transformer configuration for flexible field wiring.
  • Long Service Life: Average life duration of 25 years across the family.

Certifications & Compliance

  • UL Listed and CSA Certified
  • NEMA 3R Rated Enclosure
  • RoHS EUR Compliant
  • Mercury Free
  • Toxic Heavy Metal Free

Technical Specifications

  • Device Type: Transformer - dry
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • Warranty: 18 months
  • Country of Origin: Mexico
  • Returnability: Yes

Typical Applications

  • Commercial and Industrial Electrical Systems
  • Voltage Correction on Long Circuit Runs
  • Outdoor and Wet-Location Installations
  • Lighting and Control Circuit Supply
  • Renovation and New Construction Projects

Why Square D?

Square D transformers are engineered with dual primary and dual secondary isolation for flexible field configuration, backed by UL Listing and CSA certification for code-compliant performance. With an encapsulated, NEMA 3R-rated enclosure available across a 0.75kVA to 1.5kVA power range and a 25-year average life duration, this transformer family delivers reliable voltage correction for professional electrical installations.

Manufacturer Resources

Product Specs

Product Type:
Buck-Boost Transformer
Voltage Rating:
120x240V Primary
Configuration:
NEMA 3R Enclosure
Listing:
UL Listed
Standards:
UL-CSA
Country of Origin:
Mexico
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Transformers

Square D 750SV43F – Frequently Asked Questions

1) Can a Square D buck-boost transformer with a 120x240V primary be mounted outdoors?
Yes. The Square D buck-boost transformer comes in a NEMA 3R enclosure, which covers outdoor and wet-location mounting, and the windings are encapsulated to keep moisture and contaminants off them. That makes it usable on exterior lighting runs and yard equipment without building a separate weatherproof box around it.
2) What kVA sizes does the Square D encapsulated buck-boost transformer come in?
Three: 0.75 kVA with a 12/24V secondary, 1 kVA with a 16/32V secondary, and 1.5 kVA with a 16/32V secondary. The part numbers are 750SV43F, 1S46F and 1.5S46F. Size the unit off the load current at the corrected voltage, not off the full load kVA, since a buck-boost autotransformer connection carries only the boosted or bucked portion.
3) Will a 16/32V secondary buck-boost transformer fix a 208V supply feeding 230V equipment?
That is exactly the job it is built for. The 120 x 240V primary with a 16/32V secondary is wired as an autotransformer to add or subtract a small slice of voltage, correcting supply that runs slightly high or low. The 16/32V winding can be connected to supply 12/24, 16/32, or 24/48V of correction depending on how you land the leads, so you can dial the boost to the mismatch you actually measured.
4) Is the 0.75 kVA version the same secondary voltage as the 1 kVA and 1.5 kVA units?
No, and this catches people out. The 0.75 kVA unit (750SV43F) has a 12/24V secondary, while both the 1 kVA (1S46F) and 1.5 kVA (1.5S46F) units have a 16/32V secondary. If you are matching an existing transformer or need a specific amount of boost, pick on the secondary winding first and the kVA second.
5) Will this transformer work on a 277V or three-phase supply?
No. The primary is rated 120 x 240V single phase only, so it cannot be landed on a 277V lighting circuit or used as a single unit on three phase. For three-phase correction, electricians typically bank two or three single-phase buck-boost units in an open-delta or delta arrangement fed from the correct line voltage; a 120x240 primary unit still needs to see 120 or 240 volts across the primary in that bank.
6) Is this Square D transformer UL Listed for a commercial inspection?
It is UL Listed and CSA Certified, which is what most AHJs want to see on a dry-type transformer going into a commercial or industrial installation. It is also RoHS EUR compliant, mercury free and free of toxic heavy metals, which matters on institutional and government specs that carry environmental language.
7) What does the 115 degree C rise rating mean for how hard I can run this transformer?
A 115 C rise means the windings are allowed to run 115 C above ambient at full nameplate load, which is a lower rise than a standard 150 C unit and leaves thermal headroom for continuous or heavy duty cycles. Combined with the encapsulated construction, that is what supports the 25-year average life the unit is rated for.
8) Where is the Square D buck-boost transformer made?
Mexico. That is worth knowing on public and institutional jobs where country of origin has to be declared on the submittal along with the UL and CSA listings.
How fast can I get the Square D 750SV43F 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 750SV43F come with a warranty?
Absolutely. The Square D 750SV43F 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 750SV43F?
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 750SV43F from ZenSupply?
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