Sigma-L PLUS is the new line of digital protections designed and manufactured by COL GROUP for Medium Voltage distribution systems.

For more information, please visit the website https://colgp.it/protections-relays/

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”.

IFD4L relay is compliant with Italian document Norma CEI 0-16 in reference to “general protections” and is equpped with internal Logger.

Overcurrent and earth fault relay in accordance to CEI 0-16 norm with Data Logger. (50-51-51N-64S-64T)

Sigma-N are the digital protection relays and measurement transducers developed and manufactured by SEB for M.V. generation and distribution plants.

Voltage regulator for tap-changer (90)

Interface device for self-producers, in accordance to CEI 0-16 norm (59-27-59Vo-81)

Frequency relay (81<>-59/81-dF/dt-dphi)

Directional earth fault relay (67-67N-32)

Breaker failure device

Busbar differential relay (87B)

Generator differential relay (87G-64Ss)

Machine differential relay, according to Enel spec. DV6903RO – Ed.1 (87T)

Overall differential relay (87T)

Overcurrent protection RFI category: 794/612

Overcurrent protection RFI category: 794/410 794/502

Overcurrent and earth fault relay, in accordance to CEI 0-16 norm. (50-51-51N-64S-64T)

Overcurrent and directional earth fault relay, in accordance to CEI 0-16 norm. (50-51-67N)

Overcurrent and earth fault relay with auto-recloser (50-51-51N-64S-64T-79)

Motor protection relay (49-50-51R-46-51N-37-66)

Amperomertrical generator relay (46-49-50-51-51N)

Generator relay (40-64R-32)

Synchro check relay (25)

Synchro check relay (25)

Voltage protection relay (59-27-59Vo-64S)
Voltage balance relay (60)

Protezione di tensione e frequenza (59-27-59N-81-df/dt)

100% stator earth fault realy (64S-100%)

Directional overcurrent and earth fault relay or minimum impedance relay (67-67N-50-51-59Vo-79-21)

Generator out of step realy (78)

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)

Overcurrent and earth fault relay in accordance to CEI 0-16 norm with Data Logger. (50-51-51N)