The VME420-D-2 is a multifunctional voltage and frequency monitoring relay from Bender, part of the LINETRAXX® series. It is designed for single‑phase AC and DC systems to monitor undervoltage (< U), overvoltage (> U), underfrequency (< f), and overfrequency (> f). Voltage measurement uses the true RMS (r.m.s.) method to maintain high accuracy even in harmonic‑distorted environments. This version requires an external auxiliary supply (AC/DC 70…300 V). It features a multi‑function LC display and adjustable response delays and switching hysteresis to prevent nuisance tripping caused by start‑up transients or short voltage fluctuations.
Technical Specifications
· Rated system voltage (Uₙ): AC/DC 0…300 V, 15…460 Hz
· Supply voltage (Uₛ): AC/DC 70…300 V, 15…460 Hz
· Power consumption: ≤ 4 VA
· Monitoring functions: Undervoltage, overvoltage, underfrequency, overfrequency
· Measurement accuracy: Voltage ±1.5% ±2 digits (50/60 Hz), frequency ±0.2%
· Alarm outputs: Two independent SPDT changeover contacts, AC 250 V / 6 A
· Display: Multi‑function LC display showing real‑time voltage and frequency
· LED indicators: Power On, Alarm 1, Alarm 2
· Adjustable parameters: Start‑up delay, response delay, release delay, switching hysteresis, fault memory
· Operating temperature: –25 °C … +55 °C
· Mounting: DIN rail, width 36 mm (2 modules)
· Protection class: Housing IP30, terminals IP20
· Connection: Push‑wire terminals
· Standards compliance: RoHS
· Order number: B73010002
Key Features
· True RMS measurement (AC+DC) for harmonic‑rich systems
· Two independent alarm relays, configurable N.O./N.C. and fault memory
· Adjustable time delays and switching hysteresis to prevent nuisance tripping
· Preset function: automatically sets basic parameters on first power‑up
· Measured value memory stores the value that triggered the alarm
· Continuous self‑monitoring, password protection, sealable transparent cover
· Built‑in test/reset button
Typical Applications
· Voltage and frequency monitoring of single‑phase machines and electrical installations
· Earth fault monitoring in medium‑voltage systems via voltage transformers
· Monitoring of battery systems
· Switching machinery and equipment at specific voltage thresholds
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