Specifications

Power Distribution Modules
386
31007715 6/2008
STB PDT 3105 Field Power Over-current Protection
Fuse
Requirements
I/O modules are protected by a 5 A fuse in the STB PDT 3105 PDM. The fuse is
accessible and replaceable via a side panel on the PDM.
Recommended
Fuses
Overcurrent protection for the input and output modules on the island bus needs to
be provided by a 5 A time-lag fuse such as the Wickmann 1951500000.
Performance
Considerations
When the island is operating at an ambient temperature of 60 degrees C
(140 degrees F), the fuse can pass 4 A continuously.
Accessing
the Fuse Panels
Two panels are located on the right side of the PDM housing (see p. 381). The top
panel houses the active protection fuse and the other is not used. The top panel has
a fuse holder inside it.
Replacing a Fuse Before you replace a fuse in the STB PDT 3105, remove the power source.
BURN HAZARD - HOT FUSE
Disconnect power for 10 minutes before removing fuse.
Failure to follow these instructions can result in injury or equipment damage.
Step Action Notes
1 After you have removed the power
connector from the module and let the unit
cool down for 10 minutes, pull the PDM from
its base. Push the release buttons at the top
and bottom of the PDM and pull it from the
base.
2 Insert a small flathead screwdriver in the slot
on the left of the fuse panel door and use it
to pop the door open.
The slot is molded to protect the tip of the
screwdriver from accidentally touching
the fuse.
3 Remove the old fuse from the fuse holder
inside the panel door, and replace it with
another fuse.
Make sure that the new fuse is a 5 A fuse.
Note 10 A fuses are provided in the fuse
kit, but they should not be used with an
STB PDT 3105 module.
4 Snap the panel door(s) shut and plug the
PDM back into its base. Then plug the
connectors back into the receptacles, close
the cabinet and reapply field power.
CAUTION
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