GEK-49849
INSTANTANEOUS UNIT
1 .
Both contacts should cl ose at the same time .
2 .
The backing strip shoul d be so formed that the forked end (front) bears
against the molded strip under the armature .
3 .
With the armature against the pol e piece, the cross member of the
u p
spring
should be in a horizontal pl ane and there should be at least 1/64 inch wipe on
the contacts .
Check this by inserting a 0 . 010 inch feeler gage between the
front half of the shaded pol e with the armature held closed .
The contacts
should close with the feel er gage in place.
Contact
For cleaning fine silver contacts, a fl exible burnishing tool should be used . This
consists of a flexible strip of metal with an etched roughened surface, resembl ing in
effect a superfine file .
The polishing action is so del icate that no scratches are
left, yet corroded material wil l be removed rapidly and thoroughly . The fl exibil ity of
the tool ensures the cleaning of the actual points of contact .
Fine silver contacts shoul d not be cleaned with knives, files or abrasive paper or
cloth.
Knives or files may leave scratches which increase arcing and deterioration of
the contacts . Abrasive paper or cloth may l eave minute particl es of insul ating abrasive
material in the contacts, thus preventing contact cl osing.
The burnishing tool described above can be obtained from the factory.
RENEWAL PARTS
It is recommended that sufficient quantities of renewal parts be carried in stock
to enabl e the prompt replacement of any that are worn, broken or damaged.
When ordering renewal parts, address the nearest Sales Office of the General
Electric Company, specify quantity required, name of part wanted, and give complete
namepl ate data .
If possibl e, give the General El ectric Company requisition number on
which the relay was furnished. Refer to renewal parts publication GEF-4370 .
Since the last edition, references to contacts have been cl arified in the Directional
Unit sections under ACCEPTANCE TESTS and OPERATION
2 8
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