Directional time-overcurrent protection relay (7SR51) with 4 current transformers, 4 voltage transformers, 9 digital inputs, and 8 digital outputs, housed in an S6 enclosure.
The Siemens 7SR51 directional time-overcurrent protection relay (MLFB: 7SR5111-1AA11-0AA0) provides comprehensive protection and monitoring features. It includes four current and four voltage transformers, nine binary inputs, and eight binary outputs. The relay supports a wide range of protection functions, including definite overcurrent (ANSI 50/50N), dependent overcurrent (ANSI 51/51N), thermal overload (ANSI 49), directional overcurrent (ANSI 67), automatic reclosing (ANSI 79), and fault location (ANSI FL). Communication interfaces include 1x USB (front), RS 485 (rear), and 2x RJ45 interfaces, supporting protocols like IEC 61850-8-1, Modbus TCP/RTU, and DNP 3.0. The device features 28 LEDs, four parameter sets, and operates with a supply voltage of 100–230 V AC or 24–250 V DC.
| Weight | 3,86 kg |
|---|---|
| Dimensions | 0,34 × 0,23 × 0,23 cm |
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