ARS Trading Company

The Siemens 7SR1003-2KA20-2CA0 is a numerical protection relay from the Reyrolle 7SR100 series, designed for overcurrent and earth fault protection with IDMT (Inverse Definite Minimum Time) and definite time characteristics.

Key Features:

• Protection Functions:

  • Overcurrent (50/51)

  • Earth fault (50N/51N)

  • IDMT and Definite Time protection

• Input & Output:

  • 1A or 5A CT inputs

  • Digital inputs and relay outputs for trip and signaling

• Communication:

  • Modbus RTU & IEC 60870-5-103 for SCADA integration

• Display & Interface:

  • LCD display for settings and fault records

  • LED indicators for status and alarms

• Power Supply:

  • Wide-range auxiliary voltage options (typically 24-240V AC/DC)

This relay is widely used in industrial and utility power distribution for protecting feeders, transformers, and motors. Let me know if you need datasheets or further specifications

he Siemens 7SR5111 Directional Time Overcurrent Protection Relay is a high-performance numerical relay designed for reliable protection, control, and monitoring of electrical feeder systems. It provides advanced directional overcurrent and earth fault protection, ensuring fast and selective fault isolation based on the direction of fault current.

Engineered with intelligent algorithms and flexible configuration, the 7SR5111 relay enhances system stability, minimizes downtime, and ensures safe operation in medium and low voltage networks.

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