Wärtsilä Auxpac 20

This is a range of medium-speed generating sets running on heavy fuel oil, and based on Wärtsilä 20 engines.


    The Auxpac auxiliary generating sets are supplied as pre-engineered and pre-commissioned standard packages. The common base-frame is optimized for the package, which together with the compact design of the engine and the selected generator, offers unmatched power-to-space and power-to-weight ratios.

    The Wärtsilä Auxpac generating sets ensure the availability of electrical power in sufficient quantity, as and when it is needed. They cover an electrical power output of 500 to 2,800 kWe for either 50 or 60 Hz operation.

    Through modularization, the generating sets can be built to high, comprehensive specifications at a competitive price. Wärtsilä Auxpac generating sets provide easy installation, easy operation, and low operating costs. Other benefits of pre-engineering include readily available documentation, including models in Tribon® format, and short lead-times.

    Wärtsilä provides project management and experienced marine engineering to support the design and installation. Installation and commissioning procedures are standardized and well documented, which reduces the risk of shipyard errors. Auxpac generating sets are offered only as 400V/690V– 50Hz and 450V/690V–60 Hz in the power range 500 kW to 2800 kW.

    Wärtsilä is continuously developing its products to achieve high environmental performance. The Wärtsilä Auxpac generating sets comply with IMO Tier II MARPOL Annex VI regulations and are supplied with an EIAPP Statement of Compliance.

    A20 - rated power, dimensions (mm) and weights (tonnes)

    60 Hz
    /900 rpm
    520W4L20 520 3837 1720 2243 13,4
    645W4L20 645 4390 1720 2243 14,0
    760W6L20 760 4988 1720 2243 17,0
    875W6L20 875 5048 1720 2243 17,3
    975W6L20 975 5158 1720 2243 17,9
    1050W6L20 1050 5083 1920 2243 19,1
    1200W8L20 1200 5758 1920 2490 21,2
    1400W8L20 1400 5900 1920 2474 21,5
    1600W9L20 1600 6513 1920 2474 23,6
    50 HZ
    /1000 rpm
    520W4L20 520 3648 1770 2243 13,0
    670W4L20 670 3837 1770 2243 13,6
    790W6L20 790 4988 1770 2243 16,2
    860W6L20 860 5048 1770 2243 16,9
    1000W6L20 1000 2158 1770 2243 17,5
    1140W6L20 1140 5288 1770 2243 18,1
    1350W8L20 1350 5758 1920 2490 21,7
    1550W9L20 1550 6163 1920 2474 22,9
    1700W9L20 1700 6513 1920 2474 24,4
    Auxpac dimensions
    Pre-engineered medium-speed generating sets

    Wärtsilä Auxpac generating sets are available in a selected range as pre-engineered and pre-commissioned auxiliary generating sets. The common baseframe is optimised for the package, which together with the compact design of the engine and the selected generator, offers unmatched power-to-space and power-to-weight ratios. Other benefits of pre-engineering include readily available documentation, which also includes models in Tribon® format, and short lead-times.

    Main data 60 Hz 50 Hz IMO Tier II or III
    Voltage 450 V 400 V Fuel oil specification:
    700 cSt/50°C,
    7200 sR1/100°F,
    Protection Class IP 23, IP 44* IP 23, IP 44* ISO 8217, cat. ISO-F-RMK 55
    T° rise & isolation Class F Class F
    Cooling Air, water* Air, water* * in option


    Marine solutions drawings

    Conditions for use
    The 2D and 3D models and drawings downloaded (”Marine Solutions Drawings”) are for general guidance purposes only and should not be used for actual projects. Models and drawings for specific projects must be obtained from the appropriate Wärtsilä personnel as there may be deviations from the Downloadable Files.

    File formats
    File formats supported include DXF and PDF for 2D models and IGES, STEP, DXF, SAT and WRML for 3D models. A 2D DXF or PDF should always be used to support the 3D models. The Downloadable Files are subject to changes or improvements by Wärtsilä without notification so please check regularly for new and updated files at www.wartsila.com.

    Wärtsilä takes no responsibility for and disclaims any liability for the contents of the Downloadable Files, including but not limited to omissions, errors, deficiencies, inaccuracies contained therein, and the use or misuse thereof. In no event, shall Wärtsilä be liable for any consequential, special, contingent, or incidental damages or injury, financial or otherwise, suffered by any party arising out of, connected with, or resulting from the use of the Downloadable Files or the information contained therein.

    This website contains information, which is owned by or licensed to Wärtsilä. Wärtsilä shall retain all rights, including copyrights, relating to the information in the Downloadable Files. Reproduction or transmission to third parties is prohibited without prior written approval of Wärtsilä. Copyright © Wärtsilä.

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    Related press releases


    Expanding Wärtsilä’s Auxpac engine portfolio

    The market for auxiliary marine engines has been in decline, but there are already signs of a recovery. Market analysts are predicting that this recovery will continue and accelerate during the coming years.
    22 April 2014
    • In Detail article

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