Juniper Networks M160 Circuit Breaker Box, Electrical Specifications for Power Supply Description

M160 Internet Router Hardware Guide

Label	Color	State	Description
NO	Amber	On steadily	Power supply is inserted, but airflow around the
AIRFLOW			power supply is not sufficient.
(original
power
supply only)
CB OFF	Amber	On steadily	Power supply is functioning, but the circuit breaker
			is off.

Table 13 lists electrical specifications for the power supply.

Table 13: Electrical Specifications for Power Supply

Description	Specification
Maximum power output	Original power supply: 2400 W; nonisolated
	Enhanced power supply: 3000 W; nonisolated
DC input voltage	Nominal: –48 VDC, –60 VDC
	Operating range: –42 to –72 VDC
DC input current rating	80 A @ –48 V
Output voltages	+48 V @ 8.3 A (cooling system), +8.3 V @ 6 A (bias), –48 V to
	–60 V@ 75 A

Circuit Breaker Box

The circuit breaker box is located on the rear of the chassis, above the right power supply, as shown in Figure 2.

The circuit breaker box houses two circuit breakers and sets of terminal studs, corresponding positionally to the two power supplies, as shown in Figure 19. 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 Figure 2. For more information, see “Power, Connection, and Cable Specifications” on page 67.

38 Power System