In industrial automation, energy management and complex electrical systems, abnormal voltage is the primary cause of equipment failure, production interruption and even safety hazards. To address this issue, our MRV series of multi-function relays, with multi-dimensional dynamic monitoring algorithms as the core, integrating industrial-grade hardware design and adaptive protection mechanisms, provide precise protection for power systems from millisecond response to full life cycle management.

Main Features:

Phase Sequence Monitoring: Ensures that the power supply is in the correct phase sequence, preventing equipment damage caused by incorrect phase sequence.

Phase loss monitoring: detects the loss of power phase or voltage drop and cuts off the power supply in time to protect the equipment.

Minimum and maximum voltage protection: monitors voltage levels to prevent damage to equipment caused by too low or too high a voltage.

Asymmetrical voltage monitoring: detects the asymmetry of phase-to-phase voltage and prevents equipment failures caused by asymmetrical voltage.

Auto reset function: automatically resets the device after the monitored voltage value returns to within the set range, reducing manual intervention and downtime.

Why Choose the MRV Series?

Comprehensive Voltage Monitoring: The relay provides control over various voltage conditions, including phase sequence, total or partial phase loss, minimum and maximum voltage, and asymmetric voltage. This ensures that the electrical system operates within safe limits, preventing damage to equipment.

Adjustable Tripping Time: The tripping time for minimum and maximum voltage, as well as for asymmetric voltage, is adjustable from 0.1 to 20 seconds. This flexibility allows users to tailor the response time based on specific application needs, enhancing protection without unnecessary interruptions.

Automatic Resetting Feature: The relay features an automatic resetting mechanism that activates when the monitored values return within the programmed limits. This minimizes downtime and manual intervention, allowing for continuous operation of the electrical system.

Visual Indication of Status: The device is equipped with green and red indication LEDs. The green LED indicates power ON and tripping status, while the red LED signals different reasons for tripping. This visual feedback helps users quickly identify issues and take appropriate action.

Compliance with Safety Standards: The product complies with various international standards (e.g., IEC/EN), ensuring reliability and safety in operation.

Application Scene：

Industrial Power System:  MRV series relays are mainly used to monitor and protect the three-phase power supply in industrial power systems, to ensure that the power equipment operates under normal working conditions, and to prevent damage to the equipment due to faults such as phase sequence error, phase loss, over-voltage, under-voltage or asymmetrical voltage.

Motor Protection:    In motor-driven applications, MRV relays monitor the phase sequence and phase loss of the motor, cutting off power in time to prevent overheating or damage to the motor due to incorrect phase sequence or phase loss.  

Generator Protection:  In generator systems, MRV relays monitor the generator's output voltage and phase sequence to ensure that the generator operates within its normal operating range and to avoid generator failures due to voltage abnormalities.

Distribution systems: In distribution systems, MRV relays can be used to monitor and protect distribution transformers and distribution lines, ensuring the safety and reliability of power distribution and preventing power interruptions due to unstable voltages or phase sequence errors.

Building Electrical Systems: In the electrical systems of commercial and industrial buildings, MRV relays can be used to monitor and protect the electrical equipment in the building, ensuring the stability of the power supply and preventing fires or equipment damage caused by electrical faults.

Renewable Energy Systems: In solar power or wind power systems, MRV relays can be used to monitor the voltage and phase sequence of power generation equipment, ensuring the safe operation of renewable energy systems and preventing equipment damage due to abnormal voltage.

Automation control systems: In automation control systems, MRV relays can be used in conjunction with other control devices to provide power monitoring and protection functions to ensure the safe and stable operation of automation equipment.

MRV Application Cases:

▼ In a water treatment plant, the MRV relay prevented a 75kW pump motor from reverse operation due to phase misalignment, avoiding an estimated $15,000 in repair costs and 8 hours of downtime.

▼ In a solar farm, the MRV relay detected a 15% voltage drop caused by a faulty inverter, isolating the affected circuit and preventing a cascading failure across the array.

▼ In a manufacturing facility, the MRV relay identified a phase loss caused by a damaged cable, preventing overheating in a 50kW conveyor motor and avoiding a potential fire hazard.

▼ In a data center, the MRV6 relay detected a 4% voltage imbalance caused by an overloaded transformer, triggering an alarm and allowing engineers to rebalance the load before critical servers were affected.

▼ In a commercial building, the MRV relay automatically restored power to HVAC systems after a grid voltage fluctuation, maintaining indoor climate control without requiring technician intervention.

About Onesto:

At Onesto, we are dedicated to providing high-quality electrical solutions and safeguards that empower our clients' operations globally. Our expert team ensures that each product emerges from rigorous quality checks, ensuring excellence and reliability.

Contact Information:

• Website: www.onesto.cn
• Email: onesto@onestoelectric.com
• Phone: +86 577 8676 0560