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Features: Class H inverter-rated IRISTM insulation system Constant torque operation from 0 to base RPM rating on Vector Drives Constant HP operation to twice base RPM rating for 143T-256T frame, 1.5 x base RPM for all other sizes Designed for optimum performance with IGBT inverters - not for across-the-line starting C-face with rigid base through 100HP Normally closed thermostats (one per phase) Continuous duty at 40° C ambient 1.0 Service Factor (Class "B" rise on TEBC motors) Premium quality, cast iron frame and endbells 284T and larger are blower-cooled with a separately powered three-phase blower motor to provide added cooling at low speeds Ball bearings (Roller bearings available 360-frame and larger) Field convertible to F2 mounting Encoder provisions included on opposite drive end. UL Recognized and CSA Certified Three-Year Limited Warranty Meets NEMA MG1, parts 30 and 31