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.