Multifunction Protection
The SIPROTEC 4 7SJ61 relays can be used for line protection of high and medium voltage networks with earthed ( grounded) , low-resistance earthed, isolated or compensated neutral point. When protection motors, the SIPROTEC 4 7SJ61 is suitable for asynchronous machines of all sizes. The relay performs all functions of back-up protection supplementary to transformer differential protection.

The relay provides a simple control of the circuit-breaker and automation functions. The integrated programmable logic ( CFC) allows the user to implement their own functions, e.g. for the automation of switch-gear ( interlocking) . The user is also allowed to generate user-defined messages. The flexible communication interfaces are open for modern communication architectures with control systems