Dc Power Circuit Breaker Requirements For The Mx2020 Router - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
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DC Power Circuit Breaker Requirements for the MX2020 Router

358
Table 46: DC PSM Electrical Specifications Per Input
Configurations (continued)
Item
DC nominal input current
@ 48 VDC IN
Maximum DC output @ 52
VDC (upper and lower
cage)
DC standby output @ 5
VDC
Efficiency
NOTE: This value is within
load range 17-67% and
nominal input voltage at 48
VDC.
Calculating DC Power Requirements for MX2020 Routers on page 365
MX2020 DC Power Distribution Module Description on page 49
MX2020 DC Power Supply Module Description on page 51
MX2020 DC Power Electrical Safety Guidelines on page 342
For PDMs, if you plan to operate a maximally configured DC-powered router, we
recommend that you provision at least 80 A @ –48 VDC (nominal) for each DC input
to the system. Use a customer site circuit breaker rated according to respective National
Electrical Code and customer site internal standards to maintain proper level of protection
for the current specified above.
If you plan to operate a DC-powered router at less than the maximum configuration, we
recommend that you provision a circuit breaker according to respective National Electrical
Code and customer site internal standards to maintain proper level of protection for the
current specified above .
For PDMs, If you plan to operate a minimally configured DC-powered router, we
recommend that you provision at least 60 A @ –48 VDC (nominal) for each input to the
system. Use a customer site circuit breaker rated according to National Electrical Code
and customer site internal standards to maintain proper level of protection for the current
specified above.
If you plan to operate a DC-powered router at less than the maximum configuration, we
recommend that you provision a circuit breaker according to respective National Electrical
Code and customer site internal standards to maintain proper level of protection for the
Specification
49 A (for 2100 W output)
59 A (for 2500 W output)
2500 W
30W
91%
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