Three-Phase Adjustable Voltage and Current Protection Relay – Smart Energy Meter

This advanced three-phase adjustable protection relay is designed to provide reliable voltage, current, and temperature monitoring for industrial and commercial electrical systems. It’s the ideal solution for anyone looking to protect their equipment and installations from unpredictable electrical faults. Whether you are an electrician, facility manager, or a DIY enthusiast looking for smart electrical control, this unit ensures your electrical systems remain safe and stable.

Equipped with a wide range of adjustable thresholds, this multifunctional device automatically cuts off the power supply when the voltage, current, or temperature exceed preset limits, helping prevent damage to sensitive equipment. It then restores power once conditions return to safe levels, with optional automatic reclosing features.

Key Benefits and Features:

• Overvoltage Protection: Adjustable from 120V to 300V (default: 275V) to safeguard equipment from voltage spikes.
• Undervoltage Protection: Adjustable from 80V to 210V (default: 175V) to maintain operational stability.
• Overcurrent Limit: Adjustable from 1A to 100A (default: 80A) to prevent excessive power draw.
• Undercurrent Limit: Adjustable from 1A to 100A (default: 10A), helpful for detecting lost phases or broken circuits.
• High-Temperature Alarm: Adjustable from 10°C to 85°C (default: 85°C) for thermal protection.
• Auto-Reclosing: Automatic power reconnection with adjustable time delay and attempt limits (1–30 attempts, 1–99s delay).
• Delayed Start: Adjustable power-on delay up to 9999 seconds (default: 20s), ensuring equipment is restarted safely after a fault.
• Three-Phase Imbalance Alarms: Adjustable alerts for both voltage and current imbalance (10%–100%) help maintain phase quality.
• Flow Loss Detection: Detects and responds to lost power flow with customisable time thresholds.
• Power Monitoring: Displays total power usage up to 9,999,999.9 kWh – great for tracking consumption and efficiency.

This relay also includes intelligent fault recovery logic, adjustable event time thresholds, and protection for both over and under-voltage situations. With this device installed, you can prevent costly downtimes, reduce fire risk, and extend the lifespan of your electrical infrastructure. It’s compact, easy to wire, and compatible with a variety of setups including HVAC systems, motors, pumps, and industrial machines.