bids are invited for 400kv circuit breaker for optcl duburi site 420kv,63ka for 3s,3150a 3ph sf6 cb with provision of csd,without clos resis,with cor shield,oper mech,insu, base frame,hv term pla,ctrl cabi,supp struc,cable gla,lad and mb if appli and othr access , 420kv,63ka for 3s,3150a 3-ph sf6cb without csd,without clos resis,with cor shield,oper mech,insu,base frame,hv term pla,ctrl cabi,supp struc,cable gla,lad and mb if appli and othr acc,comp in all resp , supply-circuit breaker controlled switching device for 3-ph circuit breaker , supply-circuit breaker 420kv, foundation bolts for circuit breaker, platform and ladder if applicable and marshalling box if applicable , supply-circuit breaker 420kv,special cables for cb per csd per rp interfacing.mode of measurement shall be cable- trench running length from circuit breaker to csd per relay panel , services-circuit breaker 400kv, supervision of erection,testing and commissioning of circuit breaker , services-circuit breaker 420kv, supervision of erection testing and commissioning of controlled switching device for 3-ph circuit breaker , spares-circuit breaker closing coil , spares-circuit breaker tripping coil , spares-circuit breaker sf6 gas filling device , spares-circuit breaker set of gaskets,o rings,seals per circuit breaker total quantity : 164