Cast iron frame and brackets; Patented fracket design (TEBC enclosure)Constant torque operation from 0 to base speed on vector drive, including TEFC (On Volts/Hertz drives, TEFC motors are limited to 20:1 constant torqueConstant HP operation to twice base speed (143-256 frame); 1.5 times base (all others)MAX GUARD® Class H insulation system with CR200 corona resistant magnet wire; Continuous duty at 40° C ambient; Normally closed thermostats (one per phase, class F)Optimized for operation with IGBT inverter (NEMA Design A)Encoder provisions included on opposite drive end (see modification and/or accessory kits sections)Ball bearings (roller bearing available 360 frame & larger)Field reversible to F2; Encoder provisions included on opposite drive end (see modification and/or accessory kits sections)Bearing current protection (BCP), mounted internallyUL® Recognized & CSA certified and CE® Mark