Bender VMD421H-D-3 Voltage Monitoring Relay

Bender VMD421H-D-3 | Voltage Monitoring Relay

Specifications

• Monitoring System: 3(N)AC, 70–500 V (line-to-line), 288 V (line-to-neutral)Bender GmbH & Co. KG
• Frequency Range: 15–460 Hz (measurable); 10–500 Hz (display)
• Functions: Overvoltage, undervoltage, overfrequency, underfrequency, phase loss, phase sequence, phase asymmetry (5–30%)Bender GmbH & Co. KG
• Measurement: True RMS (AC+DC)Bender GmbH & Co. KG
• Relays: 2 independent alarm relays (1 changeover contact each)Bender GmbH & Co. KG
• Delays: Startup 0–300 s, response 0–300 s, release 0–300 s (adjustable)
• Hysteresis: AdjustableBender GmbH & Co. KG
• Display: Backlit LCD, real-time values, fault memoryBender GmbH & Co. KG
• Power: Self-powered from monitored voltage (no external supply); integrated energy backupBender GmbH & Co. KG
• Enclosure: 36 mm width, DIN rail mount, polycarbonate, IP30 (internal), IP20 (terminals)
• Certifications: CE, RoHS, IEC 61010-1Bender GmbH & Co. KG

Key Features

1. All-in-One Protection: Monitors voltage, frequency, phase loss/sequence, and asymmetry in one deviceBender GmbH & Co. KG.
2. Self-Powered: No external supply needed; draws power from the measured circuitBender GmbH & Co. KG.
3. True RMS Measurement: Accurate for distorted AC/DC waveformsBender GmbH & Co. KG.
4. Fully Adjustable: Thresholds and delays configurable via LCD; preset function for quick setupBender GmbH & Co. KG.
5. Industrial Reliability: Continuous self-test, fault memory, password protection, transparent coverBender GmbH & Co. KG.

Applications

• Industrial 3-phase systems (motors, transformers, generators)Bender GmbH & Co. KG
• Emergency/standby power systemsBender GmbH & Co. KG
• Voltage-sensitive equipment protectionBender GmbH & Co. KG
• Building automation and medical IT systems