VMD420CH-D-2 Unter- od. Überspannungsrelais
Product description
The VMD420 multifunctional voltage monitoring relays monitor frequencies, undervoltages, overvoltages and the voltage between two threshold values in 3(N)AC 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 devices require a separate supply voltage.
Main features:
- Monitoring of undervoltage, overvoltage and frequency in 3(N)AC systems 0...500 V
- Various monitoring functions selectable < U, > U, < f, > f
- Monitoring of asymmetry, phase failure, phase sequence
- Start-up, response and release delay adjustable
Features and functions:
- Monitoring of undervoltage, overvoltage and frequency in 3(N)AC systems 0...500 V
- Monitoring of asymmetry, phase failure, phase sequence
- Various monitoring functions selectable < U, > U, < f, > f
- Start-up, response and release delay adjustable
- 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:
- Measured values effective with LC display
- Supply voltage: DC 70...300 V / AC 15...460 Hz 70...300 V
- Nominal mains voltage: 15...460 Hz / 0...500 V 3(N) AC
- Display range: 0...500 V AC
Applications:
- Monitoring of voltage-sensitive machines and systems
- Switching systems on and off above a certain voltage
- Monitoring of emergency or backup power supplies
- Monitoring the supply voltage of mobile loads
- Protection of three-phase motors against phase failure and phase reversal
- Protection of transformers by detecting asymmetrical loads
Installation position:
According to the technical device manual: Any orientation