Secondary Disconnects, Bullets - ABB Emax 2 Installation And Maintenance Manual

22 - Secondary Disconnects, Bullets

AK 25 & 50 Emax 2 is Retrofill with CiC solution, so secondary disconnects are pre-installed
with the breaker (mounted on the breaker). Figure 78 & 79 shows the AKR disconnects
installed on the AK 25 Emax 2 Retrofill cassette. Max up to 4 blocks of secondary disconnects
can be installed on AK 25 Emax 2 retrofill cassette (28 points)
The wiring harness for the secondary disconnects, located on the AKD-5 retrofill cassette,
has 21 wire connections (grouped in three blocks (A, B, C)) for AK50 or 28 wire connections
(grouped in 4 blocks (A, B, C, D)) for AK25, with seven wire connections for each block). Each
wire is clearly labeled, or identified, with wire markers or tags. Each wire on the 21-wire
harness is connected to a bullet. Each bullet, when the cassette is racked in, engages with
its respective points in the switchgear. The wires for Block A are identified as A1, A2,...A7.
Block B wiring is likewise labeled as B1, B2, B3,....B7. Block C contains C1, C2,....C7. The end,
opposite of the bullets, maps or connects to the Emax 2 Retrofill Cassette 78-point,
secondary-disconnect. For example, if bullets A1 and A4 are reserved for the motor, they
connect to points A1 and A2 on the cassette's 78-point, secondary-disconnect for a motor.
Each breaker needs to be landed in the field based on the specifics breakers wiring diagram
and modifications made in the field.
Figure 78
Figure 79
Figure 80 is a photo of the AKD-5, AK25 harness & Figure 81 is an AKD-5—AK25 C-block
photo.
2TSA451011P0000 Rev-B
AK25 Retrofill Breaker Cassette Assembly (Rear View)
AK25 Retrofill Breaker Cassette Assembly (Front View)
© 2020 Emax 2 Retrofill Circuit Breakers 600A-4000A | 39