supply and delivery of oil immersed/air break starter required for maintenance of different mi installation within bankura-ii(am) sub division under bankura (a-m) division under np/mtn programme 2023-24 , oil immersed star delta starter 20 h.p(380/415 v,3 phase,50 hz ac,is 13947(part-4)/iec 60947-4-1(2000) , supply and delivery of 20 hp/15 kw heavy duty air break star delta starter with short circuit protection for use with 415v (+6% to -10%), 3 phase 50hz (±3%) ac supply conforming to iec 60947(part-4/ sec-1):2000 & is 13947(part-4/sec-1):1999 with latest amendment. starters shall consist of 4 pole heavy duty magnetic power contactor ac3 rated with encapsulated wide band operating coil (380-415 volt or suitable) and thermal overload relay (relay range: 17.4 to 24 amps or suitable) with single phase preventer,timer and on/off controls.enclosure shall be of ingress protection class 54.