Voltage protection relay LINETRAXX® VMD460-NA

frequencyphaseAC/DC

Product overview
The LINETRAXX® VMD460-NA is an external network and system protection device for automatic disconnection of power generation plants from the public grid via coupling switches. It continuously monitors voltage and frequency, displays live measurements on a backlit graphic LC display and logs events that lead to relay trips. The device is multifunctional and configurable for national grid codes.

Key features

• Pre-set basic programs for national standards and regulations (e.g. G99/1-4:2019, G98/1-4:2019, VDE-AR-N 4105)
• Islanding detection: df/dt (ROCOF) and vector shift
• Continuous monitoring of phase and line-to-line voltages
• Configurable coupling switch monitoring (NC/NO/off); single-fault tolerant design
• RS-485 interface for data exchange and parameter setting
• Remote shutdown via ripple control signal receiver
• Test functions: disconnection time test and trigger-circuit test button
• Backlit graphic LC display with language selection (DE/EN/IT)
• Password-protected settings and sealable enclosure
• Event logging: last 300 network faults with timestamp (real-time clock)

Applications

• Central network and system protection (e.g. VDE-AR-N 4105)
• Protective disconnection for generation plants parallel to the public network
• Interface protection according to national and international recommendations (EREC G99/G59/G83, CEI 0-21)
• Universal use for safe grid decoupling of distributed generation

Approvals / certificates

• VDE-AR-N 4105
• VDE-AR-N 4110
• BDEW technical guidelines
• G99 / G98 / G59 / G83
• CEI 0-21
• DIN V VDE V 0126-1-1

Variants
Type | Supply voltage U_S | Art. No.
VMD460-NA-D-2 | AC/DC 100…240 V | B93010045

Technical specifications

• Device type / commercial name: LINETRAXX® VMD460-NA
• Supply voltage (variant): AC/DC 100…240 V (VMD460-NA-D-2)
• Function: External network and system protection for disconnection via coupling switches
• Detection methods: ROCOF (df/dt) and vector shift
• Monitoring: phase voltage and line-to-line voltage
• Interfaces: RS-485 for data/parameterization; ripple control receiver for remote shutdown
• Event memory: last 300 distribution network faults with timestamp (real-time clock)
• Operation: backlit graphic LC display; language selection (DE/EN/IT)
• Security: password protection for settings; sealable housing
• Reliability: single-fault tolerant design; configurable coupling switch monitoring (NC/NO/off)