DC-to-DC Power Supply Installation Instructions
For use with the models listed below. These models can be identified by a lid with screws on the top of the lid. These models listed
below may be obsolete.
VX89301PWRSPLY – Power Supply, DC/DC, 9 to 36V
VX89A302PSDC48V – Power Supply, DC/DC, 18 to 60V
VX89303PWPSPLY – Power Supply, DC/DC, 60 to 110V
These models may be used to replace the obsolete power supplies. Contact Honeywell Technical Support or go to
for DC/DC power supply installation instructions for the replacement models listed below.
9000311PWRSPLY – Power Supply, 9-60VDC, 60W
Connecting electrical cables to power sources
The DC-to-DC power supply is used to power certain vehicle-mount computers (VMCs) or to provide vehicle power to certain hand-held
computers (HHCs) when placed in a DC powered vehicle dock or cradle.
Specifications for electrical supply
Always observe input voltage range specified on the DC-to-DC power supply and the optional screen blanking box
(for vehicle mounted terminals only).
12 VDC ± 10%
Tecton, MX9, MX3 Plus, MX7: Use a 5 A slow blow fuse.
Thor VX8, Thor VX9, Marathon: Use a 10 A slow blow fuse
Thor VM1, Thor VM2, Thor VM3: Use VM3055FUSE (or equivalent) to install the fuse as shown below:
• For 12VDC input, use the 10A fuse from the kit or a slow blow fuse that has a DC voltage rating greater than 12VDC.
• For 24VDC input, use the 6A fuse from the kit or a slow blow fuse that has a DC voltage rating greater than 24VDC.
• For 36VDC input, use the 4A fuse from the kit or a slow blow fuse that has a DC voltage rating greater than 36VDC.
• For 48VDC input, use the 3A fuse from the kit or a slow blow fuse that has a DC voltage rating greater than 48VDC.
Screen Blanking Box: Use a 3 A fuse
Please refer to the appropriate wiring schematic on the following pages for wiring colors and connections:
Figures 1a and 1b – Thor VX8 and Thor VX9 Vehicle Mounted Computers
Figures 2a and 2b – Thor VM1, Thor VM2 and Thor VM3 Vehicle Mounted Computers
Figure 3 – Marathon Vehicle Dock
Figure 4 – MX3Plus, MX7, MX7 Tecton and MX9 Vehicle Mounted Cradles
For proper and safe installation, the input power cable must be connected to a fused circuit on the vehicle. This fused
circuit requires a user supplied 5 or 10 Amp maximum time delay (slow blow, see table above for fuse rating) high
interrupting rating fuse. If the supply connection is made directly to the battery, the fuse should be installed in the
positive lead within 5 inches of the battery positive (+) terminal.
The VX power supplies are sealed per IPXX. Usage in areas where moisture can affect the power supply connections
should be avoided. The power supply should be mounted in a dry location within the vehicle or placed in a suitable
For installation by trained service personnel only.
Risk of ignition or explosion. Explosive gas mixture may be vented from battery. Work only in well ventilated area.
Avoid creating arcs and sparks at battery terminals.
162847-0001 Rev J 10/15
© 2009-2015 Honeywell International Inc. All Rights Reserved.
9000301PWRSPLY – Power Supply, 18-60VDC with cable
9000302PWRSPLY – Power Supply, 60-110VDC with cable
9000313PWRSPLY – Power Supply, 50-150VDC, 60W