• Overview
  • Documents
  • Software
  • Related applications
  • Troubleshooting
  • Case stories

Ensure safe DC-grid selectivity

VACON® NXP DCGuard™ enables fast disconnection and full selectivity be­tween DC grids for all VACON® NXP series drives.

Utilizing DC grids rather than AC grids enables power distribution with lower power losses. However, ensuring selectivity and limited short circuit energy requires more sophisticated protection devices.

VACON® NXP DCGuard is a semiconduc­tor protection device that maintains the stability of the DC grid by detecting and cutting off any faulty DC currents, fast. It isolates the faulty part of the system within 5 microseconds, protecting the surrounding equipment and ensuring uninterrupted operation.

It has DNV-GL, ABS, and Lloyd's Register type approvals, simplifying system approval for use in marine environments.

Current range

  • 465-800 VDC………3-4140 A
  • 640-1100 VDC…..….4-3100 A

Features and benefits

Correct system selectivity due to short circuit protection

No overvoltage spikes at current cut-off

Connect two different DC grids with voltage differences up to full DC voltage, thanks to controlled voltage ramp-up

Transmission cable overload protection

Reliable, proven technology

DC grids and selectivity using VACON® NXP DCGuard™

DC grids and selectivity using VACON® NXP DCGuard™

Utilizing DC grids instead of AC grids can improve system efficiency and system footprint by up to 20%. And there is a significant potential for energy saving especially when combining DC grids, energy storage and/or variable speed generators.


Type Name Language Valid for Updated Download File type
Certificate VACON NX ABS 19-LD1848307-PDA-DUP English Multiple 01 Sep, 2019 2.0 MB PDF
Certificate VACON NX ABS 19-LD1851904-PDA English Multiple 01 Jul, 2021 359.7 KB PDF
Certificate VACON NXP DC Guard CCS SW18Q00002_02 English Multiple 01 Jan, 2019 1.8 MB PDF
Certificate VACON NXP DC Guard CCS SW20PTA00002_02 English Multiple 01 Nov, 2020 250.2 KB PDF
Certificate VACON NXP DCGuard LR 18-00076 English Multiple 01 Nov, 2018 5.0 MB PDF
Application guide VACON® NXP DCGuard Application Guide English Multiple 27 Jul, 2022 2.0 MB PDF
Design guide VACON® NXP DCGuard Design Guide English Multiple 05 Dec, 2018 3.5 MB PDF
Operating guide VACON® NXP DCGuard Operating Guide English Multiple 13 Nov, 2018 2.4 MB PDF
Fact sheet VACON® NXP DCGuard™ English Multiple 05 Mar, 2019 517.3 KB PDF


Type Name Language Updated Version Status Download File type
Application Software VACON® NXP DCGuard Application 03 Jul, 2023 053 RL 2.3 MB ZIP
Fieldbus Configuration Files VACON® OPTEA SIMATIC PDM EDD 13 Nov, 2018 RL 461.7 KB ZIP

Related applications


Need answers fast? Ask MyDrive® Assistant for help with your drive

MyDrive® Assistant helps you to find information, answer common questions, or troubleshoot your motor drives and power converters.

Case stories

  • if (isSmallPicture) { VACON® drives power hybrid ferries 24/7; } else if (isBigColumns) { VACON® drives power hybrid ferries 24/7 } else { VACON® drives power hybrid ferries 24/7 }
    VACON® drives power hybrid ferries 24/7

    NETHERLANDS: Passenger ferries bridge Amsterdam’s IJ River, keeping the city connected around the clock. Hybrid propulsion powered by VACON® drives ensures 24/7 uptime, smaller generator size, better air quality, less noise and easy maneuverability of the vessels.