supply and commissioning with base modification ( as required ) of totally enclosed fan cooled slip ring crane duty motor , for main hoist, hp 40.9, kw 30.5 , rpm 970 , rotor voltage 300 v ( + / - ) 10% , rotor current 58 amp approx , frame size 225 m, voltage 415 volt ( + / - ) 10% frequency 50 hz ( + / - ) 2% ambient 50 degree centigrade , temperature rise - class b , 40% cdf . 150 starts stops per hour , mounting : foot , conforming to is 12615 / is / iec / 60034 . make marathon, crompton greaves, kirlosker, ge, kapak , aei. [ warranty period: 12 months after the date of delivery ] => limited