Dc Power Circuit Breaker Requirements For The Mx960 Router - Juniper MX960 Hardware Manual

1
These values are at full load and nominal voltage.
2
For this configuration, total power for zone 0 is 2935 W. The calculation method for zone 1 is the
same as zone 0.
3
Zone 0 requirement.
4. Calculate thermal output (BTUs). To calculate this, multiply the input power requirement (in watts) by
3.41 as shown in Table 95 on page
Table 105: Calculating Thermal Output
Power Supply
MX960 AC high-capacity
MX960 DC high-capacity
1
Zone 0 output. The calculation method for zone 1 is the same as for zone 0.
RELATED DOCUMENTATION
Power Requirements for an MX960 Router | 205
Electrical Specifications for the MX960 AC Power Supply | 203
Electrical Specifications for the MX960 DC Power Supply | 225

DC Power Circuit Breaker Requirements for the MX960 Router

If you plan to operate a maximally configured DC-powered router with normal capacity power suplies, we
recommend that you provision at least 116 A (58 A per feed) @ –48 VDC (nominal) for 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 maximally configured DC-powered router with high-capacity power supplies, we
recommend that you provision at least 208 A (104 A per supply) @ –48 VDC (nominal) for the system.
This is maximum current draw at –48 VDC when two power supplies are providing the power to the system
and the redundant power supplies are not supplying power or not present. 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.
220.
Thermal Output (BTUs per hour)
3335 * 3.41 = 11,372 BTU/hr
3413 * 3.41 = 11,638 BTU/hr
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