Dc Power Circuit Breaker Requirements For The Mx480 Router; Dc Power Source Cabling For The Mx480 Router - Juniper MX480 Hardware Manual

Table 21: Power System Specifications
Item Normal-Capacity
Redundancy 2+2
Output power 1600 W
(maximum) per
supply
Output power 3200 W
(maximum) per
system
SEE ALSO
Calculating Power Requirements for MX480 Routers | 199

DC Power Circuit Breaker Requirements for the MX480 Router

Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated circuit breaker.
If you plan to operate a maximally configured DC-powered router with normal-capacity power supplies,
we recommend that you use a dedicated customer site circuit breaker rated for 40 A (–48 VDC) minimum,
or as required by local code. If you plan to operate a maximally configured DC-powered router with
high-capacity power supplies, we recommend that you use a circuit breaker rated for 70 A (–48 VDC), or
as required by local code.
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 or each DC power supply
rated for at least 125% of the continuous current that the system draws at –48 VDC.

DC Power Source Cabling for the MX480 Router

Figure 16 on page 61 shows a typical DC source cabling arrangement.
High-Capacity
2+2
60 A (DIP=0) 70 A (DIP=1)
2240 W 2440 W
4480 W 4880 W
60