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.
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