Systems & Electronics

New Sigma-L protection line
IFX4L – Digital overcurrent and ground fault multifunction relay

The multifunction protection relay IFX4L belongs to SIGMAL digital protection line and it performs functions as phase overcurrent and earth fault relay.
IFX4L relay is compliant with Italian document Norma CEI 0-16 in reference to “general protections” and is equipped with internal Logger.
The user can select the operating modes and auxiliary functions listed in the table below:

Two-phase overcurrent 50 51
Three-phase overcurrent 50 51
Two-phase overcurrent + earth-fault 5051 50N 51N
Three-phase overcurrent + earth-fault 5051 50N 51N
Earth-fault overcurrent (non directional) 50N 51N
Stator earth-fault (95%) 64S
Transformer case earth-fault 64T
2nd harmonic restraint 50BF
Cold Load Pickup
Breaker failure
Circuit breaker monitoring


All the functions of the relay are fully programmable by front panel keyboard or through a RS485 serial interface using a personal computer with set-up program; furthermore the relay can be programmed through a remote control and monitoring system.