Merlin Gerin Sepam 2000 S36S35XRX2TBN | Protection Relay

The Merlin Gerin Sepam 2000 S36S35XRX2TBN is a robust, high-performance Protection Relay designed for the secure management and monitoring of medium-voltage distribution networks. As part of the classic Sepam 2000 series, this unit provides advanced protection functions for feeders, transformers, and motors, ensuring reliable grid operation and equipment safety. It is widely recognized for its modular design, ease of use, and dependable performance in industrial and utility-scale power distribution environments.

📋 Product Specifications

• Model Number: Sepam 2000 S36S35XRX2TBN

• Product Series: Sepam 2000

• Mounting Style: Flush-mounted panel installation

• Weight: Approximately 4.2 kg

• Country of Origin: France

• Input Current: 1A/5A (configurable)

• Auxiliary Power Supply: 24V–250V DC (wide-range)

• Operating Temperature: -10°C to +55°C

• Communication Interface: Modbus / Jbus / IEC 60870-5-103

🏢 Application Areas

This relay is specifically engineered for critical medium-voltage applications. Typical deployment scenarios include main and secondary electrical substations, industrial power distribution centers, and large-scale manufacturing facilities. It excels in providing comprehensive protection schemes for complex electrical architectures, including incoming feeders, power transformers, and large rotating machinery where precise fault detection and rapid tripping are essential to prevent costly downtime or equipment damage.

🛠️ Product Usage Instructions

1. Physical Installation: Mount the relay into a clean, dust-free cabinet cutout using the provided mounting hardware. Ensure proper ventilation space around the unit to prevent thermal buildup.

2. Wiring Connections: Connect the current transformer (CT) inputs and voltage transformer (VT) inputs to the rear terminal blocks. Always use shielded cabling for communication ports to minimize electromagnetic interference (EMI).

3. Configuration: Use the dedicated Sepam parameterization software or the front-panel human-machine interface (HMI) to set protection curves, CT ratios, and threshold values based on your network’s electrical study.

4. Commissioning: Conduct a secondary injection test to verify that the relay trips correctly at the programmed thresholds. Always double-check that the trip contacts are properly wired to the circuit breaker trip coil.

5. Periodic Maintenance: Periodically check the terminal screws for tightness and ensure the front-panel display remains clear of debris. Review internal event logs regularly to identify any transient network disturbances.

❓ Q&A

What does the S36S35XRX2TBN code represent? The suffix denotes the specific hardware configuration, including the number of analog/digital inputs/outputs and the communication protocol options. This specific model is equipped for advanced protection and multi-interface communications. Is this relay compatible with modern SCADA systems? Yes, the Sepam 2000 series supports standard industry communication protocols like Modbus, allowing for integration into modern building management or grid control systems. Can I replace a legacy unit with this model? This unit is a direct replacement for existing Sepam 2000 installations. When replacing, ensure that the firmware version is consistent with the original system to maintain seamless integration with your protection relay settings. What should I do if the relay displays a “Self-Test Error”? A self-test error indicates an internal hardware fault. First, attempt a cold restart by power-cycling the unit. If the error persists, the unit requires professional service or replacement, as internal components have likely failed.

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