GE Industrial Solutions ProTrip Conversion Kits DB-75, DBL-75, DB-100, DBL-100 - Manual (Page 5)

SECTION 3. BACK FRAME BREAKER
CONVERSION
The back frame conversion of a Westinghouse DB-75 or
DB-100 breaker consists of the following steps:
1. Remove the breaker to a clean, well-lighted work
bench and place it on its left side, so that both the
bottom and back are easily accessible.
2. Remove the existing electromechanical trip devices.
3. Install the new phase sensors (CTs).
Removing the Electromechanical Trip
Devices
1. Remove and discard the four bolts holding each trip
device to a pole of the breaker, as shown in Figure 1.
2. Remove and discard the three electromechanical trip
devices, shown in Figure 2.
CAUTION: Do not remove the trip paddles from the
common trip bar. They are used to balance the trip
action and could cause nuisance tripping if removed.
Figure 1. Removing a trip device.
Figure 2. Electromechanical trip devices removed from
the breaker.
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