LINETRAXX® VME420

Multi-functional monitoring relay for overvoltage, undervoltage, overfrequency, and underfrequency
Works on single-phase AC and DC systems up to 300 V
Digital display with real-time reading
Multiple time delays available (on startup, on trigger, on reset)
Two Form-C (SPDT) alarm contacts, configurable to trigger on any combination of alarms

The VME420 series voltage relays are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The relays require an external supply voltage.

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Multi-functional monitoring relay for overvoltage, undervoltage, overfrequency, and underfrequency
Works on single-phase AC and DC systems up to 300 V
Digital display with real-time reading
Multiple time delays available (on startup, on trigger, on reset)
Two Form-C (SPDT) alarm contacts, configurable to trigger on any combination of alarms

The VME420 series voltage relays are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The relays require an external supply voltage.

Questions? Contact us!

Features

Monitoring AC/DC systems for undervoltage, overvoltage and frequency in the voltage range of 0…300 V
Various monitoring functions selectable < U, > U, < f, > f
Start-up delay, response delay and delay on release
Adjustable switching hysteresis
r.m.s. value measurement (AC+DC)
Digital measured value display via multi-functional LC display
Preset function (automatic setting of basic parameters)
LEDs: Power On, Alarm 1, Alarm 2

Measured value memory for operating value
Continuous self monitoring
Internal test/reset button
Two separate alarm relays (one changeover contact each)
N/C or N/O operation and fault memory behaviour selectable
Password protection for device setting
Sealable transparent cover
Two-module enclosure (36 mm)
Push-wire terminal (two terminals per connection)
RoHS compliant

Applications

Single-phase voltage and frequency monitoring of machines and electrical installations
Earth fault monitoring in medium-voltage systems via voltage transformers
Monitoring of battery systems
Switching on and switching off at a certain voltage level