design, manufacture, testing, supply & delivery of 66kv sf6 circuit breakers , 66kv, 31.5ka, 1250amps triple pole, voltage nos. co-ordinated high speed, outdoortype sf-6 gas circuit breakers with spring closing and spring tripping operating mechanismwith total break time not exceeding 60ms,with first filling of sf-6 gas, complete with auxiliary switches, interlocks, multicore cables, terminal connectors and anyother accessories complete in all respects as per foregoing specificationalong with supporting structures as perstandards applicable for this specifications incorporatingthelatest edition of iec-62271 & is-13118 amended up to date or any other amended recognized latest international standard.