Circuit Breaker Box On A Dc-Powered Router; Fuses; Figure 31: M40E Circuit Breaker Box - Juniper M40E Hardware Manual

Circuit Breaker Box on a DC-Powered Router

Fuses

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On a DC-powered router, the circuit breaker box is located on the rear of the chassis,
above the right power supply, as shown in "M40e Chassis Description" on page 8. (On
an AC-powered router, the slot for the box is covered by a blank panel.)
The circuit breaker box houses two circuit breakers and sets of terminal studs,
corresponding positionally to the two power supplies, as shown in Figure 31 on page 47.
For proper router operation and power load sharing, connect a different external DC
power source to each set of terminal studs.
In addition, a grounding cable attaches to separate grounding points located above the
circuit breaker box, as shown in "M40e Chassis Description" on page 8. For more
information, see "M40e Chassis Grounding Specifications" on page 276.

Figure 31: M40e Circuit Breaker Box

The router uses fuses from the Cooper Bussman brand GMT series for the FPCs, MCSs,
PCGs, and SFMs. The fuses are located in a fuse box on the rear of the midplane. When
the fuse for a component blows, the component stops functioning even though it is
installed correctly and the power supplies are providing power to the router. For more
information, see "Using Blown Fuse Indicators to Troubleshoot the M40e Router" on
page 149. For fuse replacement instructions, see "Replacing a Fuse on an M40e Router"
on page 222.
M40e Router Power Requirements on page 274
M40e System Description on page 3
General Electrical Safety Guidelines and Warnings Electrical Codes for M Series, MX
Series, and T Series Routers on page 251
Chapter 2: M40e Hardware Components
47