Signature Series™ and Ultimate E® ODP three-phase AC motors provide both premium energy-efficiency and outstanding performance. They meet the energy efficiency requirements of the United States and Canada for general-purpose industrial motors while delivering new levels of starting torque, overload capability and reliability. Signature Series Motors Frames 48-256T Features: Industry leading 1.25 service factor, frames 143T-256T Two levels of premium efficiency, 1800 RPM Nameplated for 208V/60Hz and 50Hz Operation Continuous Duty Inverter-Rated Premium Class F Insulation System UL Recognized Component Listing and CSA certified Warranty (sine-wave power) - 48 & 56 frames: 12 months from date of first use or 18 months from date of manufacture, whichever period expires first. 143T-256T frames: 5 Years Warranty (inverter-power) - 48 & 56 frames: 1 year. 143T-256T frames: 2 years (see LC100 catalog for details) Ultimate E Motors Frames 284T-449T Features: Industry-leading 1.25 service factor through 200 HP Superior speed-torque curves - most models nameplated Design B & C Two levels of premium efficiency Nameplated for 208V/60Hz and 50Hz Operation Continuous Duty Inverter-Rated Construction Materials - steel frame and NEW! cast iron end brackets Premium Class F Plus Insulation System Solvent-based, Class H phenolic varnish provides superior bond strength E-coat prime paint Y-delta start capability frames 284T - 449T UL Recognized Component Listing and CSA certified Warranty (sine-wave power) - 5 years Warranty (inverter-power) - 2 years (see LC100 catalog for details) Made in U.S.A.