7SJ8042-5EB90-1FB0 L0A SIEMENS

The 7SJ8042-5EB90-1FB0 L0A is a versatile overcurrent protection relay designed for comprehensive power system monitoring and control. Housed in a compact 1/6 19" rack-mountable case, it features 4 current inputs (I) and 3 voltage inputs (U) for accurate measurement. Equipped with 7 binary inputs (BI) and 8 binary outputs (BO), including 2 changeover contacts and a live status contact, it offers flexible control and signaling capabilities. The relay supports a wide range of auxiliary voltages, including DC 60V/110V/125V/220V and AC 115V/230V, and is designed for flush-mounting with screw-type terminals. Compliant with IEC/ANSI standards and configurable with English language settings, it includes a standard front system port and a PROFIBUS DP slave port (electrically isolated RS485) on the rear. This relay provides advanced metering and fault recording functionality, including time overcurrent protection for phase (50/51 I>, I>>, I>>>) and ground (50N/51N, IE>, IE>>, IE>>>) faults, as well as sensitive ground fault protection (IEE>, IEE>>, IEEP). Additional protection features include overload protection (49), trip circuit supervision (74TC), circuit breaker failure protection, negative sequence protection, and undercurrent monitoring (37), along with a lockout function (86). Furthermore, it offers directional ground fault voltage and frequency protection, flexible protection functions with customizable current and voltage parameters, but excludes auto-reclosure and fault location capabilities.