Main Breaker

Prerequisites

Procedure

  1. 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

  2. Remove front cover. Refer to SC Cover Removal.
  3. Remove 4 screws and remove Breaker Panel.

    Figure 2. Open Breaker Panel

  4. Open Breaker panel by removing four screws.

    Figure 3. Open Breaker Panel

  5. Disconnect 2-pin connector. 2pin connector is located behind the Main Breaker.

    Figure 4. 2-pin connector

  6. 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

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

    Figure 6. Remove Main Breaker

    8. Notice Image
    • notice
    • When restoring the Main Breaker, do not forget to connect the two pin connector.
  8. 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.