American Power Conversion MX28B Figure 4.7-1 shows the power plants dc distribution section with the front cover removed., Figure 4.7-1. DC Distribution (Front Cover Removed)

10 MX28B
4.7 DC Distribution
A standard 24-position plug-in circuit breaker tier provides -48V distribution. The breaker
tier is connected at its center to the -48V dc bus, and each side has an ampacity of 300A.
Connections for -48V dc loads, requiring standard #10-32 two-hole lugs on 5/8-inch centers,
are located directly above the corresponding breaker. The load returns connect to the
return bus, which accommodates 24 two-hole #10-32 lugs on 5/8-inch centers, and four
two-hole ¼”-20 lugs on ¾-inch centers. The return bus also provides a pair of threaded
3/8”-16 holes on 1-inch centers for connection of a cable to the master station ground.
Figure 4.7-1 shows the power plant’s dc distribution section with the front cover removed.
Eight GMT fused outputs are also available as an option. This option uses one of the 24
available circuit breaker positions.
Figure 4.7-1. DC Distribution (Front Cover Removed)
4.8 Mounting
Both front mounting on standard 2-inch rails and optional wall mounting are available.
4.9 Environmental
Ambient Temperature: -20°C to +65°C operating
-40°C to +85°C storage
Humidity: 0% to 85% RH non-condensing operating
0% to 95% RH non-condensing storage
Altitude: Up to 3000m, operating
Up to 10,000m, storage