GE Industrial Solutions MicroVersaTrip Plus and MicroVersaTrip PM AK-1-15, AK-1-25 - Manual (Page 5)

5
SECTION 3. BACK FRAME BREAKER
CONVERSION
The back frame conversion of an I-T-E  /ABB  type
K-3000, K-3000S, K-4000, or K-4000S circuit breaker,
as shown in Figure 1, consists of the following steps:
1. Removing the existing electromechanical or solid
state trip devices.
2. Installing new phase base moldings (K-3000 and
K-4000 only).
3. Installation of the phase sensor (CT) assemblies.
Following are detailed descriptions of these steps. Be
sure to remove the breaker to a clean, will-lighted
work bench and place it in the upright position, so
that the front and back are easily accessible.
Electromechanical Trip Device Removal
(Types K-3000 and K-4000 only)
1. Remove the seven mounting screws securing the
front escutcheon to the breaker, as shown in
Figure 2, retaining all the hardware. Lift off the
escutcheon.
2. Loosen the two retaining bolts securing the arc
chutes, as shown in Figure 3. Lift out the arc
chute assemblies from each pole.
Figure 1. I-T-E/ ABB breaker before conversion.
Figure 2. Escutcheon removal.
Figure 3. Arc chute removal.