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MX28B600-48V
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5.7.2 Installation of Circuit Breakers and Fuses
5.7.2.1 Plug-in Circuit Breakers
1) Remove the circuit breaker cover panel and the plastic cover(s)/insert(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 5.7-1. The breaker alarm terminals are designed to make
contact with the alarm terminal board as the breaker is snapped into place.
NOTE: Circuit breaker alarm contacts close when the circuit breaker is tripped
but not when it is turned OFF.
***** CAUTION *****
During circuit breaker installation, carefully align the breaker alarm terminals with the
alarm terminal board to avoid breaker terminal damage.
3) Reattach the circuit breaker cover panel.
Figure 5.7-1. Installation of Circuit Breakers
5.7.2.2 Optional GMT Fuses
Fuseholders that accommodate GMT fuses are located on the interface card mounted in the top
left side of the unit. These fuseholders are only connected to -48V DC if the system has been
purchased with the GMT fuse option. This option supplies -48V DC to the fuseholders through