Name: VMD421H-D-3 Bender | JUSTWELL
SKU: VME420-D-1-1-1-1
Price: 999.00 USD
Availability: InStock

Description

Product name：VMD421H-D-3 Bender output module

Product details:

The Bender VMD421H-D-3 is a high-precision, multi-functional voltage relay designed to monitor under-voltages, over-voltages, and frequency variations in 3-phase AC systems. It is part of Bender’s VMD series, known for reliability in power quality monitoring and system protection.

1. Product Description

The VMD421H-D-3 is an electronic voltage relay used for monitoring the voltage levels and frequency in 3-phase systems. It is designed to protect electrical installations and equipment against the damaging effects of voltage fluctuations. The device features a digital display for real-time monitoring and easy configuration of setpoints.

2. Technical Parameters

The technical specifications below highlight the precision and flexibility of the device:

Parameter	Specification
Monitored Value	Under-voltage, Over-voltage, Frequency ( $f$ )
Nominal Voltage ( $U_n$ )	3AC 0…500 V, 50…60 Hz
Supply Voltage ( $U_s$ )	AC/DC 70…300 V
Over-voltage Range ( $U_{>}$ )	70…500 V
Under-voltage Range ( $U_{<}$ )	70…500 V
Frequency Range	10…600 Hz
Response Delay ( $t_{on}$ )	0…300 s (Adjustable)
Output Contacts	2 Changeover contacts (Form C)
Display	Digital LCD for values and status
Mounting	DIN rail (IEC 60715)

3. Key Advantages

True RMS Measurement: Provides accurate readings even in systems with distorted waveforms or harmonic interference.
Multifunctional Protection: Combines voltage and frequency monitoring in a single compact unit, reducing the need for multiple relays.
User-Friendly Interface: The illuminated digital display shows current measured values and simplifies the parameter setting process.
Adjustable Hysteresis & Delays: Allows for fine-tuning to prevent “nuisance tripping” caused by momentary voltage spikes or dips.
Password Protection: Settings can be locked to prevent unauthorized changes to the protection parameters.

4. Product Applications

The VMD421H-D-3 is widely used in industrial and infrastructure sectors where power stability is critical:

Renewable Energy: Monitoring the coupling point for solar and wind power plants to ensure grid stability.
Industrial Automation: Protecting sensitive motors and controllers from phase failure or voltage drops.
Data Centers: Monitoring the quality of power supply to prevent hardware damage or data loss.
Switchgear & Controlgear: Integration into distribution boards to monitor mains voltage and frequency.

5. Important Considerations (Precautions)

Supply Voltage Check: Ensure the auxiliary supply voltage ( $U_s$ ) matches the rating on the device label before powering up.
Correct Wiring: Follow the terminal diagrams strictly. Incorrect connection of phases or neutral can lead to device failure or incorrect readings.
Setting Setpoints: Ensure that the under-voltage and over-voltage thresholds are set according to the equipment’s tolerance levels, not just the nominal grid voltage.
Environmental Limits: Do not exceed the specified operating temperature and humidity limits (typically -25°C to +55°C).

Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!

We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation！

Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
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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VMD421H-D-3 Bender