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DPB2U-AB SERIES OPERATING INSTRUCTIONS - 3
© 2017 UNIPOWER LLC
This document is believed to be correct at time of publication and Unipower LLC accepts no responsibility for consequences from printing errors or inaccuracies. All specifications subject to change without notice.
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WARNING!
Removing or adding a circuit breaker should only be done by a qualified
technician who is experienced in power supply application. The changes should be done with
power disconnected from the ciruit breaker panel if possible. If it is necessary to make the
changes with a “live” operating panel, then extreme caution should be taken, including using
an insulated-handle socket wrench and screw driver.
REMOVING A CIRCUIT BREAKER
1. If possible, remove power connections to DPB2U-AB panel and put all breakers in the “OFF” position.
2. Remove front panel cover by removing the screws on each side.
3. Disconnect the desired circuit breaker at the rear by removing the top and bottom 1/4-20 nuts and washers.
4. Disconnect the NO and C wires at the breaker (if power is still connected to the panel, this will cause the
alarm to activate).
5. On the front panel, remove the top and bottom screws holding the breaker mounting bracket to the chassis.
6. From the front panel pull the circuit breaker and brackets out.
ADDING OR REPLACING A CIRCUIT BREAKER
1. If possible remove power connections to DPB2U-AB panel and put all breakers in the “OFF” position.
2. Remove front panel cover by removing the screws on each side.
3. Screw the circuit breaker onto its mounting brackets. The longer breaker bracket and the breaker “on”
position should both be “up”.
4. Insert the breaker into the front panel observing the “up” orientation and screw in place by means of the top
and bottom screws of the brackets.
5. Connect the back of the breaker to the input bus bar (at bottom) and to the load circuit (at top) by screwing
on the 1/4-20 nuts and washers.
6. Snap on the “NO” and “C” wires (for Form C relay option) to the correct terminals on the back of the breaker.
Connect the “NO” terminal (middle) of breaker on the right to the “C” terminal (bottom) of the new breaker;
connect the “NO” terminal of the new breaker to the “C” terminal of the breaker on the left. This can be seen
by observing the breakers that are already connected.
7. Replace the front panel cover by screwing in the two screws (right and left sides of the panel).
NOTE: If there are any questions on any of these procedures, please contact the factory.
