SIEMENS 7SJ8031-5EB90-1FQ0 SIPROTEC Protection Relay

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                                                                                                                                                                                                                                                                                    • The SIEMENS 7SJ8031-5EB90-1FQ0 is a SIPROTEC 7SJ80 numerical overcurrent and feeder protection relay for medium- and high-voltage power systems. The 7SJ80 family provides protection, control, monitoring, measurement and communication functions for feeders and lines.

                                                                                                                                                                                                                                                                                      Item	Specification
                                                                                                                                                                                                                                                                                      Brand	SIEMENS
                                                                                                                                                                                                                                                                                      Model	7SJ8031-5EB90-1FQ0
                                                                                                                                                                                                                                                                                      Series	SIPROTEC 7SJ80
                                                                                                                                                                                                                                                                                      Product Type	Numerical Protection Relay
                                                                                                                                                                                                                                                                                      Application	Feeder / Overcurrent Protection
                                                                                                                                                                                                                                                                                      Current Inputs	4 × I
                                                                                                                                                                                                                                                                                      Current Rating	1 A / 5 A
                                                                                                                                                                                                                                                                                      Auxiliary Supply	60 / 110 / 125 / 220 VDC; 115 / 230 VAC*
                                                                                                                                                                                                                                                                                      Binary Inputs	3*
                                                                                                                                                                                                                                                                                      Binary Outputs	5, including 2 changeover contacts*
                                                                                                                                                                                                                                                                                      Protection Functions	Phase & Earth Overcurrent, Overload, Negative Sequence, Undercurrent
                                                                                                                                                                                                                                                                                      Fault Recording	Yes
                                                                                                                                                                                                                                                                                      Mounting	Flush mounting
                                                                                                                                                                                                                                                                                      Connection	Screw terminals
                                                                                                                                                                                                                                                                                      Engineering Software	DIGSI 4
                                                                                                                                                                                                                                                                                      Weight	Approx. 4 kg
                                                                                                                                                                                                                                                                                      Origin	Germany

                                                                                                                                                                                                                                                                                      *The exact hardware/configuration depends on the complete MLFB suffix. Siemens documentation confirms that the 7SJ80 family is available in different I/O, supply and communication configurations, so the nameplate should be checked before claiming configuration-specific features.

                                                                                                                                                                                                                                                                                      Protection Functions

                                                                                                                                                                                                                                                                                      • Phase overcurrent protection (50/51)
                                                                                                                                                                                                                                                                                      • Earth/ground-fault protection (50N/51N)
                                                                                                                                                                                                                                                                                      • Overload protection (49)
                                                                                                                                                                                                                                                                                      • Negative-sequence protection
                                                                                                                                                                                                                                                                                      • Undercurrent monitoring (37)
                                                                                                                                                                                                                                                                                      • Circuit-breaker failure protection
                                                                                                                                                                                                                                                                                      • Trip-circuit supervision
                                                                                                                                                                                                                                                                                      • Lockout function
                                                                                                                                                                                                                                                                                      • Fault recording

.The structure and details of the product：

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