Siemens 7SR1811-1NC77-0CA0

The Siemens 7SR1811-1NC77-0CA0 is a SOLKOR 7SR18 differential protection relay designed to provide reliable fault detection and system protection. This unit features an E6 case size and includes 3 binary inputs along with 5 binary outputs, offering versatile control and monitoring capabilities. Equipped with 18 LEDs, the relay provides clear visual status indicators for easy operation. It supports measurement inputs for up to four current transformers (1A/5A) and operates on a wide voltage range, from 24 to 250 V DC or 100 to 230 V AC. The binary input threshold is set at 88 V DC, and communication is handled via an optical fibre link at 1300 nm using an LC connection, supporting distances up to 40 km. Distributed by BSP Automation, this Siemens differential protection relay is well-suited for enhancing the safety and reliability of electrical systems.