Why a Redundant Power Solution Is Essential for Safety Barriers

In industrial measurement and control systems—especially those located in Hazardous Areas—intrinsically safe isolation barriers play a crucial role in limiting energy and protecting field devices.

If the power supply to these I.S. barriers is interrupted, it can lead to:

• Process downtime

• Loss of safety-related signals

• Increased explosion risk

• Disruption of Safety Instrumented Systems (SIS)

Therefore, implementing a redundant power supply solution is critical to ensuring continuous system operation.

2. PR 9410 – Redundant Power Control Unit for PR 9000 Series Barriers

The PR 9410 Power Control Unit is specifically designed to manage and distribute power to the Power Rail system (DIN-rail) used by PR electronics 9000 series modules.

2.1. Key Functions of the PR 9410

• Supplies stable, filtered 24 VDC power to the DIN-rail

• Certified for Zone 2 (IIC T4) hazardous areas

• Manages power distribution to all connected barrier modules

• Monitors operational status of each module

2.2. Flexible Redundancy Modes

PR 9410 supports multiple redundancy configurations:

✔ Simple Redundancy – 2PS + 1PR

• One PR 9410 receives two independent 24 VDC power sources

• If one source fails → the remaining source maintains system operation

✔ Advanced Redundancy – 4PS + 2PR and 2PS + 2PR

When using two PR 9410 units on the same power rail:

• 4PS + 2PR: four independent 24 VDC supplies

• 2PS + 2PR: two independent 24 VDC supplies

In both configurations:
➡ Only one PR 9410 with at least one power source is required to keep the power rail active

2.3. Fault Monitoring and Alarm Functions

PR 9410 continuously monitors:

• Overload

• Short circuits

• Power failure

• Module errors

If a fault occurs, the status relay sends an alarm signal to the PLC/SCADA system for immediate intervention.

3. Siemens SITOP PSU6200 – A Reliable Industrial Power Supply

To form a complete redundant power system, the PR 9410 is combined with the Siemens SITOP PSU6200, a highly reliable industrial power supply known for robustness and diagnostic capabilities.

3.1. Advantages of SITOP PSU6200

• Wide input voltage range:
  85–264 V AC / 110–275 V DC
  or 323–576 V 3AC

• Output options: 12V / 24V / 48V DC, tolerance ±3%

• Fully compatible with PR 9410 (24 VDC output)

• EX version certified for Zone 2 (IIC T3)

• Efficiency up to 96%

• Compact, rugged industrial design

• Push-in terminals for quick installation

3.2. Wide Power Range

• Standard version: 1.3A – 40A

• EX version: 5A – 20A

4. System Architecture: Redundant Configuration 2PS + 2PR

A complete redundant system consists of:

• 2× Siemens SITOP PSU6200 (each powered from an independent AC source)

• 2× PR 9410 installed side-by-side on the 9000 series DIN rail

Operating Principle

⭐ Normal Operation

• Both PSU6200 units supply power to their respective PR 9410

• Both PR 9410 units distribute and monitor power to the rail

⭐ Fault Condition

If any PSU6200 or PR 9410 fails:
➡ The remaining unit instantly takes over the entire load

⭐ Fault Alarm

• PR 9410 or PSU6200 triggers a status relay

• Alarm signal sent to PLC for rapid diagnosis and troubleshooting

5. Key Benefits of the DIN-Rail Redundant Power Solution

🔒 High System Reliability

Ensures continuous power supply and reduces costly downtime.

🔥 Operational Safety

Certified Zone 2 solution, fully compatible with PR 9000 I.S. barriers.

🛠 Proactive Monitoring

Early fault detection prevents system-wide failures.

💡 Cost Efficiency

• Fewer wiring connections

• Simplified installation

• Standard components that are easy to maintain

6. Conclusion

The combination of PR 9410 and Siemens SITOP PSU6200 delivers a high-reliability DIN-rail redundant power supply solution that is:

• Safe – certified for Hazardous Area Zone 2

• Stable – continuous operation even during faults

• Efficient – suitable for modern factory automation and energy systems

This solution is ideal for industries such as oil & gas, chemical processing, energy, manufacturing, and any facility requiring a robust redundant power system for intrinsically safe barrier modules.

Conclusion – Contact Us for Consultation and Pricing

We are the official representative of PR electronics in Vietnam, providing technical support, installation guidance, and genuine warranty services.

For more detailed technical information, please visit PR electronics’ official website or contact our authorized distributor.

Vntech Group JSC is the exclusive distributor of PR electronics (Denmark) and other high-end industrial and automation products from Europe.
We are committed to delivering the best solutions and ensuring customer satisfaction.