Overcurrent Tripping Device - Westinghouse DB-50 Instructions Manual

Page 12
In replacing closing coil be sure to re­
place brass tube (5) so that stationary core
(4) and moving core (3) are aligned in the
tube . Re-assemble clos ing coil and details
in reverse order from removal.
If the circuit breaker is permanently
mounted near the floor so that the closing
coil cannot be dropped far enough for re­
moval then follow these directions.
breaker and remove breaker manual op­
erating handle and breaker face plate . Dis­
connect closing coil leads from control cir­
cuit wiring. Take off bolts (9), washers
(12 ) , relay release arm (8) , bolts (10) ,
washers (11) and plate ( 2 ) .
coil ( 7) with brass tube (5) so that pin ( 6 )
i s exposed. Push pin (6) to right into hole
on right hand side of solenoid yoke (1) and
allow moving core (3) to drop into brass
tube (5) .
tube and moving core and bring out through
the U-shaped foot on breaker .
in reverse order from removal. Take care
to align stationary core ( 4) and moving core
(3) in brass tube (5).
Trip
ages at the terminal of the closing coil, and
the closing currents at normal voltage are
listed in Table No. 2 shown on Page 7.
Drop closing
OVE RCURRENT TRIPPING D E VICE
The overcurrent trip is an air delayed
device that can be supplied with various
rating coils ranging from 2 0 0 to 1600 am-
RO L LER
LEVER
HANDLE
UPPER
SPRING GUIDE
LOWER SPRING GUIDE
SPRING MECHANISM
Fig. 3A - Type DB-50 Spring Closing Assembly
Pick up closing coil with brass
Re-assemble closing coil and details
The minimum permissible control volt­
MECHANISM
LATCH
PLATE
SPRING