Installing the phase sensors (cts) – GE Industrial Solutions ProTrip Conversion Kits DB-25, DBL-25, DB-50, DBL-50 User Manual
Page 8
Installing the Phase Sensors (CTs)
Insulating
Barrier
1
/
2
-13
Bolt
CT Post
The CTs must be assembled with their associated
copper bus parts before they can be installed onto the
breaker frame in the spaces previously occupied by the
electromechanical trip devices.
1. Slide the CT over the post on the lower copper bus
strap, as shown in Figure 7. Place the insulating
barrier on the top of the CT.
CT
2. On a DB-50 breaker, place the top bus strap over the
insulating barrier and insert a
1
/
2
-13 x 1
1
/
4
" bolt, with
a flat washer and lock washer, as shown in Figure 9.
Leave the bolt finger tight for now.
Top Bus
Strap
On a DB-25 breaker, place the top bus strap over the
insulating barrier and insert a
3
/
8
-16 x 1
1
/
4
" bolt, with
a flat washer and lock washer, as shown in Figure 9.
Leave the bolt finger tight for now.
Figure 7. Assembling a CT to the bus.
Figure 8. CT assembly for a DB-50 breaker.
Figure 9. CT assembly for a DB-25 breaker.
3
/
8
-16
Bolt
1
/
2
-13
Bolt
8