SIGMA – L
Sigma-L are the small size digital protection relays developed and manufactured by SEB for M.V. distribution plants.
DIA4L protection relay is compliant with Italian document Norma CEI 0-16 (2019-04) in reference to “interface protections”.
Overcurrent and earth fault relay in accordance to CEI 0-16 norm with Data Logger. (50-51-51N-64S-64T)
SIGMA – N
Sigma-N are the digital protection relays and measurement transducers developed and manufactured by SEB for M.V. generation and distribution plants.
Machine differential relay, according to Enel spec. DV6903RO – Ed.1 (87T)
Overcurrent and directional earth fault relay, in accordance to CEI 0-16 norm. (50-51-67N)
Directional overcurrent and earth fault relay or minimum impedance relay (67-67N-50-51-59Vo-79-21)
SIGMA – S
Sigma-S are the low cost digital protection relays developed and manufactured by SEB for M.V. generation and distribution plants.
Protezione di interfaccia per autoproduttori a norma CEI 0-21 (2012-06) (59-27-81)