Relpol RPN-1VFR-A400 3-Phase Monitoring Relay 1P 3(N)400/230V AC 50/60 Hz

The Relpol RPN-1VFR-A400 is a high-precision 3-phase monitoring relay engineered for demanding industrial and electrical automation environments. This device is designed to continuously supervise the parameters of a 3-phase power supply, ensuring that voltage levels remain within safe operational limits. By integrating this relay into your electrical distribution network, you gain a robust solution for detecting phase failures, imbalances, or incorrect sequences, thereby protecting sensitive equipment from potential damage caused by unstable power conditions.

Advantages

This monitoring relay offers exceptional reliability and accuracy in detecting electrical anomalies, which is critical for maintaining the longevity of industrial machinery. Its compact design allows for efficient installation in standard control cabinets, while the high-quality internal components ensure consistent performance even in challenging operational conditions. By providing real-time monitoring, the device helps prevent costly downtime and reduces the risk of electrical fires or hardware failure caused by phase-related faults.

Suitable for

• Industrial automation and control systems
• Power distribution networks in commercial buildings
• Protection of 3-phase motors and pumps
• Electrical panels requiring phase sequence and loss monitoring

When it may not be suitable

This device is specifically designed for 3-phase systems and will not function correctly in single-phase applications. It is not intended for use in environments with extreme moisture or high levels of conductive dust unless housed in an appropriate protective enclosure.

Key specifications

• Rated voltage: 3(N)400/230V AC
• Frequency: 50/60 Hz
• Output configuration: 1P (1 changeover contact)
• Application: 3-phase monitoring

How to use

The relay should be installed by a qualified professional in accordance with local electrical regulations. It is typically mounted on a standard DIN rail within a control panel. Connect the phase lines to the designated input terminals, ensuring that the wiring matches the voltage specifications of the device. Once installed, the relay will automatically begin monitoring the supply. Status indicators on the front panel provide visual confirmation of the current operational state and any detected faults.

What to consider before purchase

• Verify that your supply voltage matches the 3(N)400/230V AC requirement.
• Ensure the control circuit load is compatible with the 1P output rating.
• Confirm that the installation environment meets the necessary IP rating requirements for your specific application.

Usage recommendations

Regularly inspect the terminal connections to ensure they remain tight and free from oxidation. Periodically test the monitoring function during scheduled maintenance to confirm that the relay correctly triggers the protection sequence when simulated faults occur.