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MX28B600-48V
10
4.7 DC Distribution
Two plug-in circuit breaker tiers, consisting of a 24-position panel and two 10-position panels,
provide 43 positions of -48V distribution. One position is reserved for the Manual Battery
Disconnect Switch. The breaker tiers are center fed via bus bars to the -48V DC bus with each
side having 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, and are configured at the factory.
Figure 4.7-1. Upper Tier DC Distribution (Front Cover Removed)
4.8 Mounting
Front mounting on standard 72” or 84” high, 23-inch rails
4.9 Environmental
• Ambient Temperature: -20°C to +65°C (-4°F to +149°F) operating
-40°C to +85°C (-40°F to +185°F) storage
• Humidity: 0% to 85% RH non-condensing operating
0% to 95% RH non-condensing storage
• Altitude: Up to 3000m (9800Ft) operating
Up to 10,000m (32,000Ft) storage