tender for supply and delivery of 20 hp heavy duty air break star delta starter operating at 415 v (+%6 to -10%) and 50hz(=3%). the equipment shall comply with is-60947/2000(part-4 sec-i) and its latest amendments. , supply and delivery of 20 hp heavy duity air break star delta starter operating at 415 v (+%6 to -10%) and 50hz(=3%). the equipment shall comply with is-60947/2000(part-4 sec-i) and its latest amendments. starter shall comprise of overload protective device, main and auxillary contacts, single phasing preventer, timer and on/off controls. it shall be of utilization categories ssuitable for the particular application as shown in table-i of is/iec 60947-4-1 for electrical motor circuits unless otherwise specified and display of voltage and current as well as on-off- trip position.