LINETRAXX® VMD421H

Multi-functional voltage relay for 3(N)AC systems,
frequency/overvoltage/undervoltage/phase sequence/window discriminator function
Phase sequence, phase failure, asymmetry

Undervoltage, overvoltage and frequency monitoring in 3(N)AC systems 70...500/288 V
Without external supply voltage
Integrated energy backup
Asymmetry, phase failure and phase sequence monitoring
Various monitoring functions selectable <U, >U, <f/>f
Start-up delay, response delay, 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 for Power On, Alarm 1, Alarm 2
Measured value memory for operating value
Permanent self-monitoring
Test/reset button internal
Two separate alarm relays for each changeover contact
N/C or N/O operation and fault memory behaviour selectable
Password protection for device setting
Sealable transparent cover
2-module enclosure (36 mm)
Push-wire terminal (two terminals per connection)
RoHS-compliant

Supply voltage US: none (internally supplied by Un)
Power consumption: ≤ 6 VA
Undervoltage < U (Alarm 2) (measurement method: 3Ph/3n ) AC 70...500 V/70...288 V
Overvoltage > U (Alarm 1) (measurement method: 3Ph/3n ) AC 70...500 V/70...288 V
Resolution of setting U: 1 V
Asymmetry: 5...30 % (30 %)
Phase failure: by setting the asymmetry
Phase sequence: clockwise/anticlockwise rotation (off)
Underfrequence < Hz: 10...500 Hz
Overfrequence > Hz: 10...500 Hz
Resolution of setting f 10.0...99.9 Hz: 	0.1 Hz
Resolution of setting f 100...500 Hz: 1 Hz
Switching elements: 2 x 1 changeover contacts (K1, K2)
Start-up delay t: 0...300 s (0 s)
Response delay ton1/2: 0...300 s (0 s)
Start-up delay toff: 0...300 s (0.5 s)

History memory (HiS) for the first alarm value data record measured values
Password protection: Off/0...999 (OFF)
Connection type: Push-wire terminals/Screw terminals 
EMC IEC 61326-1
Operating temperature: -25...+55 °C

Manufacturer:
Bender GmbH & Co. KG
Londorfer Straße 65
35305 Gruenberg

Type: VMD421-D-3
Article number: B93010007