tender for 11 kv 3phase 50hz insulated metal clad vcb 400 amps with rupturing capacity of not less than250 mva at 11 kv for 3 sec., indoor type cts for metering & protection shall have suitable va & cts ratio100/50/5 amps, incoming & outgoing cable box. generally conforming to is:13118 (1991): latest, class-indoor,type-3 pole cb for use in 3 phase system, rated voltage (in kv)-12, rated insulation level rated short duration :28, power frequency with stand voltage (in kv), rated insulation level: 20 50hz, 400a, 11kv, rated short timewith stand current (in ka): 25, rated peak with stand(in ka)- 63, rated duration of short circuit-3 sec, ratedsupply voltage of closing and opening device and of auxiliary circuit:24v including /along with all accessories.
