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BENDER GmbH & Co KG
LINETRAXX® VMD258

LINETRAXX® VMD258

Product catalog summary

Product Description
The LINETRAXX® VMD258 is an undervoltage/overvoltage relay designed for monitoring three-phase AC systems without the need for a neutral conductor connection, making it suitable for 3AC systems. It uses purely analogue technology, ensuring high availability for power plant applications. The device is powered by the system it monitors, with isolated electronics and relay connections to prevent interference.

Functionality
The relay operates with alarm relays K1/K2 for undervoltage in normally closed (N/C) operation and K3/K4 for overvoltage in normally open (N/O) operation. When system voltage falls below or exceeds set response values, corresponding LEDs light up, and relays switch after a delay. The system resets to its initial state approximately 100 ms after returning to normal voltage levels.

Standards Compliance
The VMD258 complies with DIN EN 60255-1 and IEC 60255-127 standards, ensuring it meets common and functional requirements for measuring relays and protection equipment.

Device Features

High availability with analogue technology
Monitoring for undervoltage and overvoltage in 3AC systems
No separate supply voltage required
Adjustable response values and delays
Nominal system voltages range from 100 V to 690 V
LED indicators for operation, overvoltage, and undervoltage

Technical Data
The device supports a frequency range of 45-66 Hz, with an operating range of 0.5 to 1.3 times the supply voltage. It has a short-time overload capability of 1.5 times the supply voltage for less than 1 second. The relay features two changeover contacts for switching, with a rated operational current of up to 5 A.

Environmental and Mechanical Specifications
The VMD258 operates within a temperature range of -20 to +70 °C and complies with various EMC and mechanical standards. It is designed for continuous operation and can be mounted on a DIN rail.

Ordering Information
The document provides part numbers for different voltage configurations and available accessories, such as additional mounting clips and an energy backup device.

Catalog excerpts

The Power in Electrical Safety® Undervoltage/overvoltage relay for monitoring three-phase AC systems (window function) for power plant applications

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LINETRAXX® VMD258 Undervoltage/overvoltage relay for monitoring three-phase AC systems (window function) for power plant applications Device features • High availability due to purely analogue technology • Undervoltage and overvoltage monitoring for 3AC systems • No separate supply voltage required • Separate alarm relays for undervoltage and overvoltage with two potential-free changeover contacts • Adjustable response value: • Nominal system voltages: • Adjustable response delay: 0.5 s • LEDs for operation, overvoltage, undervoltage Product description The voltage relay VMD258 monitors three-phase...

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Undervoltage/overvoltage relay LINETRAXX® VMD258 Operating elements Wiring diagram

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Undervoltage/overvoltage relay LINETRAXX® VMD258 Ordering details Additional mounting clips (screw mounting) Energy backup ES258 Dimension diagrams Dimensions in mm 108 Diagram operating times tae As is shown in the diagram below, the operating time (tae) depends on the ratio of the measured voltage (Um) to the switching threshold (Us). Examples for tae: Abhängige Zeitcharakteristik/Dependent time characteristic

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Undervoltage/overvoltage relay LINETRAXX® VMD258 Technical data Switching elements Number of switching elements Operating mode Rated impulse voltage (kV) Pollution degree Overvoltage category Voltage ranges Operating range Short-time overload capability Electrical endurance, number of cycles Contact data acc. to IEC 60947-5-1 Rated operational voltage Utilisation category Rated operational current Minimum current 2 x 2 changeover contacts N/C operation (undervoltage) N/O operation (overvoltage) 10000 Power consumption Measuring circuit Nominal system voltage Un Setting range Short-time overload...

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BENDER Group VMD258_D00068_03_D_XXEN/04.2023 / © Bender GmbH & Co. KG, Germany – Subject to change! The specified standards take into account the edition valid until 04.2023 unless otherwise indicated. Bender GmbH & Co. KG Londorfer Straße 65 • 35305 Grünberg • Germany Tel.: +49 6401 807-0 • [email protected] • www

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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