Voltage and Current Meter: Protects electrical equipment by instantly cutting off power during overvoltage, undervoltage, or overcurrent events. Automatically resets when line voltage returns to normal. Circuit Protection: Suitable for monitoring three-phase four-wire systems or electrical equipment, providing protection against overvoltage, undervoltage, overcurrent, phase imbalance, and phase sequence errors, ensuring electrical safety. Real-time Monitoring: Features an LCD display for clear, at-a-glance monitoring of voltage and overcurrent status. Easy to Use: Installs on a standard DIN35mm rail without screws, offering easy installation, a compact design, and convenience. Safe to Use: Built with a magnetic latching relay to prevent burnout from high current impact. The shell is made of high-quality, flame-retardant, and high-temperature resistant PC material with insulation protection.