MX240 DC Power Supply Description
Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated customer site 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.
For high capacity power supplies, we recommend that you provision 60 A or 75A per feed, depending on the selected DIP switch setting.
Figure 1: DC Power Supply
Figure 2: High-Capacity DC Power Supply
DC Power Supply Configurations
In the DC power configuration, the router contains either one or two DC power supplies (see Figure 1) located at the rear of the chassis in slots PEM0 and PEM2 (left to right). You can upgrade your DC power system from one to two power supplies. A single DC power supply provides power to all components. One DC power supply is required. A second DC power supply provides redundancy. If a DC power supply in a redundant configuration fails, the redundant power supply takes over without interruption.
High-capacity DC power supplies have a DIP switch that selects the power output.
 | Note: Move the input switch to 0 for 60 A input and position 1 for 70 A input. |
| Note: Do not set the input mode switch if the power supply is installed in the chassis. If the power supply is already installed, you must remove it before setting the input mode switch. |
