The VMD422-D-2 is a three‑phase voltage and frequency monitoring relay from Bender, part of the LINETRAXX® series. It is designed for interface protection of distributed generation systems (>30 kW) connected to public low‑voltage grids in accordance with DIN V VDE V 0126‑1‑1. When voltage or frequency exceeds preset limits, the device activates its alarm relays within 180 ms. This version requires an external auxiliary supply (AC/DC 70…300 V).
Technical Specifications
· Rated system voltage: 3(N)AC 0…500 V, 40…65 Hz
· Supply voltage: AC/DC 70…300 V, 15…460 Hz
· Power consumption: ≤ 4 VA
· Monitoring functions: Undervoltage, overvoltage (including 10‑minute average overvoltage), underfrequency, overfrequency, asymmetry, phase failure, phase sequence
· Alarm outputs: Two independent changeover contacts, AC 250 V / 6 A
· Display: LC display showing voltage and frequency in real time
· LED indicators: Power On, Alarm 1, Alarm 2
· Time delays: Start‑up delay and release delay adjustable 0…300 s
· Operating temperature: –25 °C … +55 °C
· Mounting: DIN rail, width 36 mm
· Protection class: Housing IP30, terminals IP20
· Connection: Push‑wire terminals
· Order number: B73010007
Key Features
· Pre‑set limits according to DIN VDE 0126‑1‑1, password‑protected
· 10‑minute average overvoltage monitoring prevents nuisance tripping due to short voltage spikes
· True RMS measurement for accurate readings in harmonic‑rich systems
· Event memory stores the first measured value that triggered the alarm
· Continuous self‑monitoring ensures operational reliability
· Sealable transparent cover prevents unauthorised parameter changes
Typical Applications
· Voltage and frequency monitoring for photovoltaic plants (>30 kW), wind power, hydropower, and CHP units connected to the public grid
· Automatic switching point supervision and grid interface protection
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