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MX28B400 +24 VDC User’s Manual Page 12
Plug-in Circuit Breaker Installation
CAUTION During circuit breaker installation, carefully align the breaker
alarm terminals with the alarm terminal board to avoid breaker terminal
damage.
1) Remove the circuit breaker cover panel and the plastic cover(s) from the desired location(s).
2) Install the circuit breaker(s) by snapping the top terminal onto the upper bus bar and rotating
the unit down until the second terminal snaps onto the breaker termination post as shown in
Figure 3.6-3 The breaker alarm terminals are designed to make contact with the alarm
terminal board as the breaker is snapped into place.
3) Reattach the circuit breaker cover panel.
NOTE: Circuit breaker alarm contacts close when the circuit breaker is tripped but not
when it is turned OFF.
Figure 3.6-3. Installation of Circuit Breakers
Load Cable Size Considerations
The DC load cable(s) should be sized sufficiently large to limit the voltage drop from the MX28B
DC power plant to the loads per system design requirements. The cable(s) must also carry the
full load current during battery operation. During battery operation the voltage will be lower and
for constant power loads, therefore the current will typically be higher. If assistance is required
to determine the necessary cables for the application, contact your sales representative or APC.