supply of 11kv, 250mva, outdoor sf6 insulated, ring main units (rmu) with vacuum circuit breakers or sf6 circuit breakers with associated control and relay panels , items : , 3-way, sf6 insulated, ring main unit fitted with sf6/vcb breaker consisting of one isolator, one tee off unit and one fault making, fault breaking circuit breaker with cable terminations on front side of rmu suitable for distribution automation (type-a) , 4-way, sf6 insulated, ring main unit fitted with sf6/vcb breaker consisting of one isolator, two tee off units and one fault making, fault breaking feeder circuit breaker with cable terminations on front side of rmu suitable for distribution automation (type-b) , 4-way, sf6 insulated, ring main unit fitted with sf6/vcb breaker consisting of one isolator, one tee off unit and two fault making, fault breaking feeder circuit breakers and with cable terminations on front side of rmu suitable for distribution automation (type-c)