Inspection - Westinghouse DE-ION DB-75 Instructions Manual

RECEIVING, HANDLING AND STORING
Type OB-75 air circuit breaker s, are shipped
in wooden crates with all attachme nts mounted
in place.
To avoid damage to the break­
IMPORTANT:
in handling.
ers, DO NOT USE HOOKS
Net weights of Type DB-75 are given in
Table No. 1.
TABLE NO. 1
2 POLE
400 lbs.
Immediately upon receipt, examine shipment
for any loss or damage incurred during ship­
ment. If injury or rough handling is evident,
file a damage claim at once with the trans­
p ortation company and n o tify t he n earest
Westinghouse Sales Offi�e.
When u np acking, be sure that n o loose
parts are missing or left in the packing ma­
terial. Report all shortages at once.
out any dust or particles of packing material
that may have accumulated on the circuit break­
Do
er parts. not remove the cardboard "dust
g uards" from top of the arc chutes until the
breaker is to be placed in service.

INSPECTION

The "DB" breaker assembly consists of a
coordinated group of sub-assemblies mounted
on an aluminum supporting panel. The complete
breaker assembly is to be mounted with the
a luminum panel in a vertical position.
i nspec tions f o r proper o peration shou ld,
therefore, be made with the breaker in this
position. Final inspection should preferably
b e made with the breaker in its permanent
mounting.
6
PART I
NET WEIGIITS
3 POLE
500 lbs.
Blow
All
Inspect the breaker as fo II ows:
1. Lift trip finger by hand to make sure that
it does no� bind.
2. Remove any foreign particles from the hinge
end of the moving contacts.
3. Insert the maintenance operating handle
and slowly close the breaker.
a . Observe whether all parts are in proper
alignment and move freely.
b. Be sure that the contacts are clean and
properly aligned.
c. The hinge end of the moving contact is
lubricated with graphite grease and is there­
fore black. For a description of contact
alignment refer to "CONTACTS", Page (11) .
4. If the contacts are in a lignment and all
parts move freely, continue the closing until
the breaker is latched.
�. Hold t he maintenance operating handle
down. Push the "Push to Trip" button to trip
breaker.
a. The toggle linkage should collapse and
the moving contact assembly move freely to
the full open position.
l owed by complete resetting of the links in
the toggle mechanism as the handle is raised.
b. The l inks must always be free to move
without friction or binding.
6 . Check the attachments for operation in
accordance with the appropriate instructions
as given under "Maintenance".
this book.
NOTE: It is not advisable to lubricate any
parts of the breaker. The lubrication supplied
during factory assembly is sufficient f or
This should be fol­
Part III of
I. B. 35-240-1