Juniper MX240 - DC Power Circuit Breaker Requirements for the MX240 Router; Table 84: Calculating Thermal Output

Table 84: Calculating Thermal Output
Thermal Output (BTUs per hour)Power Supply
1747 * 3.41 = 5957 BTU/hrMX240 AC Normal-capacity (high-line)
1669 * 3.41 = 5576 BTU/hrMX240 AC High-capacity (high-line)
1515 * 3.41 = 5166 BTU/hrMX240 DC Normal-capacity
1515 * 3.41 = 5166 BTU/hrMX240 DC High-capacity
Related
Documentation
Power Requirements for an MX240 Router on page 128•
• AC Power Supply Electrical Specifications for the MX240 Router on page 127
• DC Power Supply Electrical Specifications for the MX240 Router on page 143
DC Power Circuit Breaker Requirements for the MX240 Router
Each DC power supply has a single DC input (–48 VDC and return) that requires a
dedicated circuit breaker. We recommend that you use a dedicated customer site circuit
breaker rated for 40 A (–48 VDC) minimum, or as required by local code. Doing so enables
you to operate the router in any configuration without upgrading the power infrastructure.
For high-capacity power supplies, we recommend that you use a dedicated customer
site circuit breaker rated for 60 A or 70A, or as required by local code,depending on the
input switch setting.
If you plan to operate a DC-powered router at less than the maximum configuration and
do not provision a 40 A (–48 VDC) circuit breaker, we recommend that you provision a
dedicated customer site circuit breaker for each DC power supply rated for at least 125%
of the continuous current that the system draws at –48 VDC.
Related
Documentation
Connecting Power to a DC-Powered MX240 Router with Normal-Capacity Power
Supplies on page 201
•
• Installing an MX240 DC Normal Capacity Power Supply on page 258
• DC Power Disconnection Warning for M Series, MX Series, and T Series Routers
• DC Power Source Cabling for the MX240 Router on page 159
• DC Power Cable Specifications for the MX240 Router on page 160
Copyright © 2017, Juniper Networks, Inc.156
MX240 3D Universal Edge Router Hardware Guide