EXN Energy Efficient Transformer Family

Square D transformers manufactured by Schneider Electric™ are optimized for performance, including the following components:

• Coil—Designed to reduce the losses with customized wire configurations used exclusively by Schneider Electric. Computer-controlled winding equipment minimizes variability during the winding process. Aluminum conductors are standard with copper conductors available as a factory option.

• Insulation System—The system consists of a conductor wrap or coating, layer insulation, air gap spacing, and varnish material. The system is UL listed for a specific maximum temperature for average temperature rise, hot spot, and ambient temperature. Schneider Electric’s EXN family of transformers have a 428°F (220°C) insulation system, with an average temperature rise maximum of 302°F (150°C).

• Core—EXN Transformers are designed with high-grade grain oriented, non-aging silicon steel laminations with high magnetic permeability, low hysteresis, and low eddy current losses. The computer-aided process allows the design to keep the magnetic flux densities well below the saturation point. The laminations are carefully and evenly stacked via distributive gap laminations, then clamped together to ensure an efficient magnetic circuit while providing a quiet quality offering of low voltage transformers.

• Terminals—Sized to allow the lugs to align with all corresponding Schneider Electric equipment (such as circuit breakers, switches, panelboards, switchboards, etc.). The terminal positioning separates the Primary and Secondary terminals and meets the National Electrical Code® (NEC®) minimum wire bending requirements. Lugs are not shipped with the transformer. This allows the installer the flexibility to order what is needed to meet any distribution system requirements. NOTE: Both mechanical and compression lug kits are available from Schneider Electric.

  Terminals are standardized to National Electrical Manufacturers Association® (NEMA®) two-pole pad dimensions.