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MX28B200/400 –48 VDC User’s Manual (990-9133) Page 11
3.6. DC Power Output Over-Current Protection
DC Circuit Breakers
A standard 24-position plug-in circuit breaker tier provides -48V distribution. Various
circuit breaker sizes from 1 to 100 amps are available, with 60-100 amp breakers
requiring two positions and a circuit breaker adapter kit. The breaker tier is connected at
its center to the -48V DC bus, and each side has an ampacity of 300A. It is therefore
necessary to balance the load on the MX28B-400 plant to avoid overloading the output
bus. Also when planning the output installation, take into consideration the configuration
of the plant and the number of rectifiers installed.
Any combination of up to 24 single (1-50 Amp) or up to 12 double (60-100 Amp) breakers
may be installed. Figure 3.6-1 shows the power plant’s DC distribution section with the
front cover removed.
Figure 3.6-1 DC Distribution (Front Cover Removed)
Available plug-in circuit breakers are shown below. These are only breakers and do not
include any hardware.