The VME420-D-1 is a multifunctional voltage and frequency monitoring relay from the Bender LINETRAXX® series. It is designed for monitoring undervoltage (< U), overvoltage (> U), underfrequency (< f), and overfrequency (> f) in AC and DC systems up to 300 V. Voltage measurement uses true RMS (r.m.s.) method for high accuracy even in harmonic‑rich environments.
This version requires an external auxiliary supply of AC 16…72 V / DC 9.6…94 V.
Technical Specifications
· Rated system voltage (Uₙ): AC/DC 0…300 V, 15…460 Hz
· Monitoring functions: Undervoltage, overvoltage, underfrequency, overfrequency
· Alarm outputs: Two independent SPDT changeover contacts, AC 250 V / 6 A
· Display: Multi‑function backlit LC display showing real‑time measured values
· LED indicators: Power On, Alarm 1, Alarm 2
· Adjustable parameters: Start‑up delay, response delay, release delay, switching hysteresis, fault memory behaviour
· Mounting: DIN rail, width 36 mm
· Protection class: Housing IP30, terminals IP20
· Connection: Push‑wire terminals (dual terminals per connection point)
· Operating temperature: –25 °C … +55 °C
· Standards compliance: RoHS
· Order number: B73010001
Key Features
· True RMS measurement (AC+DC) – Accurate readings even in harmonic‑distorted systems
· Preset function – Automatically determines system voltage on first power‑on and sets basic thresholds, simplifying commissioning
· Event memory – Stores the first measured value that triggered an alarm for easy fault diagnosis
· Password protection – Prevents unauthorised parameter changes
· Sealable transparent cover – Protects against unauthorised access to the operating panel
· Continuous self‑monitoring – Internal self‑diagnostics ensure operational reliability
· Built‑in test/reset button – Allows manual testing and reset without external controls
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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