Field Discharge Switch - Westinghouse DB-50 Instructions Manual

MOVING CORE
Fig. 1 7 - Undervoltage Trip Attachment - Construction Details
FIE LD DISCHARGE SWITCH
The DBF-16 breaker is a two-pole DB-50
breaker having special arc chutes and modi­
fied arcing contacts plus a field discharge
switch mounted on the center pole (Fig. 20) .
The field discharge switch is shipped
with the gap setting shown in Fig. 20, for
generator field protection.
gap setting can be reduced to zero or set
to open after the breaker contacts close , if
CROSS
COl
ST
CORE
to interrupt motor starting secondary cur­
However , the
the lock nut and turning the sleeve in or out.
Always leave a slight gap at the stop surface.
T R I P
S P R I N G
desired. An arc chute is always supplied
rents.
Inspection
Remove the arc chute , close the breaker
manually and check for freedom of motion.
The break distance is adjusted by loosening
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