BENDER VMD420-D-1 Voltage Monitoring Relay

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Product Description

The BENDER VMD420-D-1 is a LINETRAXX voltage and frequency monitoring relay designed for three-phase AC systems, with or without a neutral conductor. It monitors overvoltage, undervoltage, frequency, phase failure, phase sequence, and voltage asymmetry to help protect electrical equipment.

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Technical Specifications

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Key Features and Advantages

• Comprehensive Voltage Monitoring: Detects voltage deviations and abnormal operating conditions.

• Phase Monitoring: Identifies phase loss, incorrect phase sequence, and phase asymmetry.

• Frequency Monitoring: Supports monitoring of upper and lower frequency limits.

• Adjustable Response Times: Helps prevent unnecessary alarms caused by brief voltage fluctuations.

• Dual Alarm Relays: Provides separate outputs for alarm signaling and control functions.

• LCD Display: Shows measured values and device status for troubleshooting.

Typical Applications

• Three-phase motor protection

• Industrial electrical distribution

• Transformer and power supply monitoring

• Standby and emergency power systems

• Factory automation and control cabinets

Installation and Ordering Precautions

1. Confirm the exact model VMD420-D-1 and auxiliary supply requirements.

2. Do not confuse it with the VMD420-D-2, which has a different auxiliary supply voltage range.

3. Check whether the unit uses push-wire or screw-type terminals.

4. Follow the manufacturer's wiring diagram and installation instructions.

5. Installation and commissioning should be performed by qualified electrical personnel.

The structure and details of the product：

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