Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG Protection Relay

The Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG is a multifunctional digital feeder, motor and backup protection relay belonging to the mature SIPROTEC 4 series, designed for medium voltage distribution networks. This Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG integrates protection functions, circuit breaker control, metering, fault recording and programmable automation logic into one compact flush-mount IED, suitable for earthed, low-resistance earthed, isolated and compensated neutral MV systems. The Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG is widely stocked as a spare and retrofit unit for utility and industrial substation cabinets.

The Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG provides phase and earth overcurrent protection with directional supervision, thermal overload protection, second harmonic restraint and breaker failure backup protection. It supports configurable time curves complying with IEC and ANSI standards, and built-in CFC programmable logic enables custom interlocking, alarm and automation schemes. The front panel of the Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG includes a backlit text display and function keys for local setting checks, manual breaker operation and fault indication. DIGSI 4 engineering software is used for parameter uploading, downloading and waveform analysis after fault events.

This Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG is equipped with Ethernet communication supporting IEC 61850 and DNP3 protocols, enabling GOOSE messaging and data exchange with SCADA and bay control systems. It has 11 binary inputs and 6 binary output contacts for trip, alarm and status signaling. The Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG supports 5A CT secondary inputs and works for both 50Hz and 60Hz power systems. Its 1/3 19-inch form factor fits standard protection panel layouts and meets industrial EMC requirements for substation electromagnetic environments.

The Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG is commonly deployed for overhead feeders, cable feeders, large motor feeders and transformer backup protection in power plants, mining power systems and water treatment substations. Replacing a faulty relay with the Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG quickly restores selective protection coordination and breaker control. As a reliable SIPROTEC 4 protection device, the Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG remains essential for facilities maintaining legacy substation automation systems. ESD precautions should be followed during handling of the Siemens Siprotec 7SJ6225-5EB90-1FE0-Z/GG to protect internal electronic circuits.