Supply of two 2(two) nos sf-6 gas circuit breakers, 245kv,3150a,3-phase, 50hz individual pole operated by a motor-wound spring-spring operating control mechanism along with galvanized steel support structures including adapter plate, inter-pole cables, terminal connectors, all the accessories, mandatory spares including design, manufacturing, testing, inspection at manufacturer works, packing and forwarding along with supervision of erection, testing and commissioning of breakers at 220kv switchyard of nagarjunasagar main power house, telangana