MOTOR ELEC 1HP 1800RPM 230/460|TEFC 56C|Sterling's adjustable frequency motors have a 3-phase power supply running at 60 Hz (standard 208-230/460 or 575V). These motors are mounted with a horizontal foot, and feature a totally enclosed fan-cooled enclosure. Other outstanding features include a special spike-resistant magnet wire, Class H insulation with Class B temperature rise, full phase-to-phase insulation, and a standard winding temperature thermostat. TEFC 56C