BENDER VMD421H-D-3 Voltage Monitoring Relay

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BENDER VMD421H-D-3 Voltage Monitoring Relay

Product Overview

The VMD421H-D-3 is a multifunctional voltage and frequency monitoring relay designed for three-phase AC systems (0–500V). It provides comprehensive protection against overvoltage, undervoltage, phase imbalance, phase sequence errors, and frequency deviations, ensuring safe operation in industrial and medical IT systems .

Key Features

✅ Comprehensive Voltage & Frequency Monitoring

• Monitors three-phase AC systems (0–500V) for overvoltage, undervoltage, and frequency deviations .

• Detects phase sequence errors, phase loss, and asymmetry .

✅ Adjustable Thresholds & Delays

• Configurable response thresholds for voltage and frequency monitoring .

• Adjustable delays (startup, response, and release) to accommodate system-specific conditions .

✅ True RMS Measurement & Display

• Real-time LCD display showing voltage, frequency, and system status .

• True RMS measurement for accurate readings under distorted waveforms .

✅ Dual Alarm Relays & Event Logging

• Two SPDT relay outputs (configurable as NO/NC) for fault signaling .

• Stores last trip event in memory for diagnostics .

✅ Robust Industrial Design

• DIN rail mounting (compact form factor) .

• Operates without external power (self-powered from monitored system) .

Technical Specifications

The structure and details of the product：

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