SIGMA - N

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

IFX4N

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

IFD4N

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

DIA4N

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

IFX4NR

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

UAR4N

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

IAD3N

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

UHF4N

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

IMT4N

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

ZFD8N

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

HAR1N

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

ING4N

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

PQR4N

Generator relay (40-64R-32)

IDG8N

Generator differential relay (87G-64Ss)

IDT8N

Overall differential relay (87T)

SCK4N

Synchro check relay (25)

SCK4N-D

Synchro check relay (25)

CU90N

Voltage regulator for tap-changer (90)

UHR4N

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

ZFP8N

Generator out of step realy (78)

IBF4N

Breaker failure device

IDB4N

Busbar differential relay (87B)

IDM8N

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

IFF4N

Overcurrent protection RFI category: 794/410 794/502

IFF4E

Overcurrent protection RFI category: 794/612

SIGMA - L

Sigma-L are the small size digital protection relays developed and manufactured by SEB for M.V. distribution plants.

IFX4L

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

SIGMA - S

Sigma-S are the low cost digital protection relays developed and manufactured by SEB for M.V. generation and distribution plants.

IFX3S

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

DIA3S

Protezione di interfaccia per autoproduttori a norma CEI 0-21 (2012-06) (59-27-81)