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

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.