1
These values are at full load and nominal voltage.
2
For this configuration, total power is 1090 W.
3
Zone 0 requirement.
4. Calculate thermal output (BTUs). To calculate this, multiply the input power
requirement (in watts) by 3.41.
Table 96: Calculating Thermal Output
Thermal Output (BTUs per hour)Power Supply
1282 * 3.41 = 4372 BTU/hrMX480 AC Normal-capacity (high-line)
1225 * 3.41 = 4177 BTU/hrMX480 AC High-capacity (high-line)
1112 * 3.41 = 3792 BTU/hr
1
MX480 DC Normal-capacity
1112 * 3.41 = 3792 BTU/hr
1
MX480 DC High-capacity
1
Zone 0 output.
Related
Documentation
Power Requirements for an MX480 Router on page 140•
• AC Electrical Specifications for the MX480 Router on page 139
• DC Power Supply Electrical Specifications for the MX480 Router on page 157
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 configuredDC-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.
Related
Documentation
DC Power Supply Electrical Specifications for the MX480 Router on page 157•
• Calculating Power Requirements for MX480 Routers on page 149
171Copyright © 2017, Juniper Networks, Inc.
Chapter 13: DC Power Requirements, Specifications, and Guidelines
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