VME421HCH-D-2 Unter- od. Überspannungsrelais

The VME421H series voltage relays monitor frequency, undervoltage, overvoltage and the voltage between two threshold values (window function) in AC and DC systems. The voltages are measured as effective values. The current measured value is permanently shown on the LC display. The measured value leading to the switching of the alarm relays is stored. Adjustable delay times allow system-specific characteristics to be taken into account, e.g. device-related start-up phases, short-term voltage changes, etc. The VME421H version draws the supply voltage from the system to be monitored and has an internal energy storage devicefuse.

Main features:

- Undervoltage and overvoltage monitoring and frequency monitoring of AC/DC systems 9.6...150 V (VME421H-D-1), 70...300 V (VME421H-D-2)

- Integrated energy storage, supplied from the network to be monitored

- Various monitoring functions selectable < U, > U, < f/> f

- Password protection for device settings

- Preset function (automatic basic parameterization)

Features and functions:

- Undervoltage and overvoltage monitoring and frequency monitoring of AC/DC systems, 9.6...150 V (VME421H-D-1), 70...300 V (VME421H-D-2)

- Without separate supply voltage

- Integrated energy storage

- Various monitoring functions selectable < U, > U, < f, > f

- Start-up, response and release delay

- Adjustable switching hysteresis

- Effective value measurement (AC + DC)

- Digital measured value display via multifunctional LC display

- Preset function (automatic basic parameterization)

- LEDs for operation, alarm 1, alarm 2

- Measured value memory for trigger value

- Permanent self-monitoring

- Internal test/reset button

- Two separate alarm relays, 1 changeover contact each

- Quiescent/operating current and fault memory behavior selectable

- Password protection for device settings

- Sealable transparent cover

- 2-module housing (36 mm)

- Spring terminal (two terminals per connection)

- RoHS-compliant

Technical features:

- With frequency monitoring

- For single-phase systems

- Special firmware suitable for Swiss applications

- 2 changeover contacts

- Display range: AC/DC 70 ...300 V

- Mains voltage: DC 70...300 V / 15 ...460 Hz / 70 ...300 V AC

- The device does not require a separate supply voltage

- Dimensions W36 x H90 x D110 mm

- Weight: 240g

Applications:

- Voltage and frequency monitoring of single-phase machines and systems

- Earth fault monitoring via voltage transformers in medium-voltage networks

- Monitoring of battery systems

- Switching systems on and off above a certain voltage