Provides a 24 V dc Power Supply from a vessel’s main ac supply. The unit automatically switches to 24 V dc backup supply if the main ac supply fails.

SKU: F081001 Categories: ,


The MD81/24 from MARINE DATA is a power supply unit which operates from a ship’s 110 V / 220 V ac 50 / 60 Hz single phase supply and provides a 24 V dc output. The MD81/24 can also be factory configured to provide ‘S’ Type 35 V, 50 V or 70 V dc outputs for legacy equipment (option).

The MD81/24 has an automatic changeover facility to switch to the ship’s backup (standby) 24 V dc supply in the event of a main power supply failure.

The MD81/24 also incorporates a power failure alarm circuit which meets IMO recommendations. Power failure is indicated visually on the front of the enclosure and a relay contact is provided to activate an external alarm system if required.
Constructed in a robust die-cast aluminium enclosure and finished in RAL9005 Jet Black fine texture paint, the MD81/24 is designed to complement existing marine navigation equipment. The MD81/24 is supplied with fixing centres for bulkhead mounting.
Compact and rugged, the MD81/24 offers a power supply solution for locations where space is limited.
The MD81/24 Power Supply from MARINE DATA: flexible in application, easy to install and simple to maintain.


  • Linear power supply with low EMC emissions and high immunity
  • High surge current capability
  • Automatic changeover to backup (standby) dc supply in the event of main ac power failure
  • All dc outputs are rectified
  • The main and backup (standby) power supply inputs can be isolated
  • All inputs and outputs are fuse protected


  • The MD81 is suitable for supplying 24 V dc to ships navigation equipment where security of supply requires the automatic changeover to a backup dc supply in the event of a main ac power failure


  • All MARINE DATA Navigation Equipment requiring a safeguarded 24 V dc supply


  • Weight: 2.8 kg
  • Dimensions: H 222 mm; W 180 mm; D 133 mm
  • Mounting: Bulkhead
  • Connections: 4x M20 cable glands; M4 earth stud; 2x internal barrier strips
  • Construction: Die cast aluminium enclosure
  • Finish: RAL9005 Jet Black, fine texture paint


  • Type: Toroidal transformer
  • Input Power: 24 V dc Backup (Standby) supply; 220 V or 110 V ac; 50 / 60 Hz main power
  • Output Power: 24 V dc; 4 A; Factory options: 35 V, 50 V, 70 V dc
  • External Alarm: Volt free contacts


  • MTBF: >30,000 hours


  • IP rating: IP42
  • Operating temp: -15°C to +55°C
  • RoHS: Compliant
  • Compass: Safe distance 200 cm


  • The trigger circuit for the external alarm sounder is closed loop (volt free) rated @ 3 A; 24 V dc Normally open (NO) and normally closed (NC) configurations are supported

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