VMD421H-D-3 BENDER Controller module

Description

VMD421H-D-3 BENDER Controller module

Product Dimensions：

Product Description

The Bender VMD421H-D-3 (Art. No. B93010007) is a high-precision, multi-functional voltage monitoring relay from the LINETRAXX® series. It is designed to supervise 3-phase AC systems for voltage and frequency irregularities.

The VMD421H-D-3 is engineered for reliability in industrial environments. It functions without an external power supply, as it is powered directly by the system it monitors. It includes an internal energy backup to ensure the device remains operational during short-term power failures.

Product Parameters

• Monitored Systems: 3(N)AC systems (3-phase with or without neutral).
• Voltage Measuring Range: 70…500 V (AC, True RMS).
• Frequency Range: 15…460 Hz.
• Monitoring Functions:
  • Under/Overvoltage (<U,>U).
  • Under/Overfrequency (<f, >f).
  • Asymmetry monitoring (5–30%).
  • Phase failure and phase sequence detection.
• Output: 2 separate alarm relays (each with one changeover contact/SPDT).
• Display: Multi-functional LC display for real-time values and status.
• Dimensions: 2-module enclosure (36 mm width), suitable for DIN rail mounting.
• Terminals: Push-wire (B73010007) or Screw-type (B93010007) terminal variants available.

Product Advantages

• Comprehensive Diagnostics: Provides continuous self-monitoring and a history memory for service and troubleshooting.
• High Flexibility: Features adjustable response delays, start-up delays, and delay-on-release timers, allowing it to filter out short-term fluctuations or inrush currents.
• Preset Function: Includes an automatic parameter setting feature to speed up commissioning.
• Safety: Offers password protection for device settings and a sealable transparent cover to prevent unauthorized access.
• Robustness: Integrated energy storage allows for stable operation even during network interruptions.

Product Applications

• Mechanical Engineering: Protection against faults caused by phase loss, phase sequence errors, or voltage drops.
• Power Distribution: Monitoring of main supply lines, backup power systems, and transfer points.
• Emergency Power Systems: Monitoring of standby generators and emergency feed systems.
• Sensitive Infrastructure: Protecting voltage-sensitive machinery in industrial plants and building services engineering.

Precautions

• Expert Installation: The device must only be installed and commissioned by qualified electrical engineering professionals.
• IT System Safety: If the device is connected to an IT (ungrounded) system, both supply lines must be protected by appropriate fuses.
• Voltage Ratings: Ensure the system voltage does not exceed the specified 500V range.
• Safety Standards: Observe local electrical safety codes and the provided installation manual regarding hazardous voltages.
• Grounding: Although it is self-powered, always ensure proper terminal connection according to the wiring diagram to maintain measurement accuracy and electrical safety.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

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