Main Breaker

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	60 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard Tool	1	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Main Breaker (Refer to Illustrated Parts)	1	-	-	-

Table 4. Safety

DANGER

ELECTROCUTION HAZARD!

DANGEROUS AND OR FATAL VOLTAGES ARE PRESENT IN THE ENERGIZED CABINET.

Follow LOTO steps as given in first section of this document to disable and verify safe voltage levels.

Table 5. Required conditions
Condition	Reference	Effectivity
PDU and Service Disconnect Panel (or Main Disconnect Panel) must be turned OFF. Refer to Lockout / Tagout for MDP(Main Disconnect Panel) or Facility PDU.	-	-

Check the AC Voltage between φA-B, φB-C, and φC-A (Primary) and verify that the voltage is under 1VAC.

Figure 1. Voltage Check
Remove front cover. Refer to SC Cover Removal.
Remove 4 screws and remove Breaker Panel.

Figure 2. Open Breaker Panel
Open Breaker panel by removing four screws.

Figure 3. Open Breaker Panel
Disconnect 2-pin connector. 2pin connector is located behind the Main Breaker.

Figure 4. 2-pin connector
Remove 6 screws from the main Breaker terminal and remove cables. Use 5mm hex wrench.

Note:
To access to the screws and remove cables, it is easier to remove separator panel. Slide the panel forward and remove them for easy operation.

Figure 5. Remove 6 screws
Notice

When removing Main Breaker, slowly withdraw it not to damage 2 pin connector behind it.
Remove 2 silver screws and remove main breaker.

Figure 6. Remove Main Breaker
Notice

When restoring the Main Breaker, do not forget to connect the two pin connector.
Restore it by the reverse order of the removal.
1. Before installing main Breaker, make sure separator panels are removed.
2. Connect two pin connector.
3. Attach Insulator sheet (Black color) behind the main Breaker.
  
  Figure 7. Insulator sheet
4. Install Main Breaker with 4 screws.
5. Install cables with 6 screws.
6. Install Separator Panels.
7. Restore Breaker Panel.
8. Restore Breaker Panel.

Restore Power for main input circuit breaker.
Restore the Power. Refer to Lockout / Tagout for MDP(Main Disconnect Panel) or Facility PDU.
Run one head or body scan.